SiStripAPVRestorer.cc

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#include "RecoLocalTracker/SiStripZeroSuppression/interface/SiStripAPVRestorer.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
 
#include <cmath>
#include <iostream>
#include <algorithm>
 
SiStripAPVRestorer::SiStripAPVRestorer(const edm::ParameterSet& conf)
    : quality_cache_id(-1),
      noise_cache_id(-1),
      pedestal_cache_id(-1),
      forceNoRestore_(conf.getParameter<bool>("ForceNoRestore")),
      inspectAlgo_(conf.getParameter<std::string>("APVInspectMode")),
      restoreAlgo_(conf.getParameter<std::string>("APVRestoreMode")),
      // CM map settings
      useRealMeanCM_(conf.getParameter<bool>("useRealMeanCM")),
      meanCM_(conf.getParameter<int32_t>("MeanCM")),
      deltaCMThreshold_(conf.getParameter<uint32_t>("DeltaCMThreshold")),
      // abnormal baseline inspect
      fraction_(conf.getParameter<double>("Fraction")),
      deviation_(conf.getParameter<uint32_t>("Deviation")),
      // nullInspect
      restoreThreshold_(conf.getParameter<double>("restoreThreshold")),
      // baseline and saturation inspect
      nSaturatedStrip_(conf.getParameter<uint32_t>("nSaturatedStrip")),
      // FlatRegionsFinder
      nSigmaNoiseDerTh_(conf.getParameter<uint32_t>("nSigmaNoiseDerTh")),
      consecThreshold_(conf.getParameter<uint32_t>("consecThreshold")),
      nSmooth_(conf.getParameter<uint32_t>("nSmooth")),
      distortionThreshold_(conf.getParameter<uint32_t>("distortionThreshold")),
      applyBaselineCleaner_(conf.getParameter<bool>("ApplyBaselineCleaner")),
      cleaningSequence_(conf.getParameter<uint32_t>("CleaningSequence")),
      // cleaner_localmin
      slopeX_(conf.getParameter<int32_t>("slopeX")),
      slopeY_(conf.getParameter<int32_t>("slopeY")),
      // cleaner_monotony
      hitStripThreshold_(conf.getParameter<uint32_t>("hitStripThreshold")),
      // baseline follower (restore)
      minStripsToFit_(conf.getParameter<uint32_t>("minStripsToFit")),
      applyBaselineRejection_(conf.getParameter<bool>("ApplyBaselineRejection")),
      filteredBaselineMax_(conf.getParameter<double>("filteredBaselineMax")),
      filteredBaselineDerivativeSumSquare_(conf.getParameter<double>("filteredBaselineDerivativeSumSquare")),
      // derivative follower restorer
      gradient_threshold_(conf.getParameter<int>("discontinuityThreshold")),
      last_gradient_(conf.getParameter<int>("lastGradient")),
      size_window_(conf.getParameter<int>("sizeWindow")),
      width_cluster_(conf.getParameter<int>("widthCluster")) {
  if (restoreAlgo_ == "BaselineFollower" && inspectAlgo_ != "BaselineFollower" && inspectAlgo_ != "Hybrid")
    throw cms::Exception("Incompatible Algorithm")
        << "The BaselineFollower restore method requires the BaselineFollower (or Hybrid) inspect method";
}
 
void SiStripAPVRestorer::init(const edm::EventSetup& es) {
  uint32_t n_cache_id = es.get<SiStripNoisesRcd>().cacheIdentifier();
  uint32_t q_cache_id = es.get<SiStripQualityRcd>().cacheIdentifier();
  uint32_t p_cache_id = es.get<SiStripPedestalsRcd>().cacheIdentifier();
 
  if (n_cache_id != noise_cache_id) {
    es.get<SiStripNoisesRcd>().get(noiseHandle);
    noise_cache_id = n_cache_id;
  } else {
    noise_cache_id = n_cache_id;
  }
  if (q_cache_id != quality_cache_id) {
    es.get<SiStripQualityRcd>().get(qualityHandle);
    quality_cache_id = q_cache_id;
  } else {
    quality_cache_id = q_cache_id;
  }
 
  if (p_cache_id != pedestal_cache_id) {
    es.get<SiStripPedestalsRcd>().get(pedestalHandle);
    pedestal_cache_id = p_cache_id;
  } else {
    pedestal_cache_id = p_cache_id;
  }
}
 
uint16_t SiStripAPVRestorer::inspectAndRestore(uint32_t detId,
                                               uint16_t firstAPV,
                                               const digivector_t& rawDigisPedSubtracted,
                                               digivector_t& processedRawDigi,
                                               const medians_t& vmedians) {
  auto nAPVFlagged = inspect(detId, firstAPV, rawDigisPedSubtracted, vmedians);
  restore(firstAPV, processedRawDigi);
  return nAPVFlagged;
}
 
uint16_t SiStripAPVRestorer::inspect(uint32_t detId,
                                     uint16_t firstAPV,
                                     const digivector_t& digis,
                                     const medians_t& vmedians) {
  detId_ = detId;
 
  apvFlags_.assign(6, "");
  apvFlagsBoolOverride_.assign(6, false);
  apvFlagsBool_.clear();
  median_.assign(6, -999);
  badAPVs_.assign(6, false);
  smoothedMaps_.clear();
  baselineMap_.clear();
  for (const auto& med : vmedians) {
    auto iAPV = med.first;
    median_[iAPV] = med.second;
    badAPVs_[iAPV] = qualityHandle->IsApvBad(detId_, iAPV);
  }
 
  uint16_t nAPVFlagged = 0;
  if (inspectAlgo_ == "Hybrid")
    nAPVFlagged = hybridFormatInspect(firstAPV, digis);
  else if (inspectAlgo_ == "HybridEmulation")
    nAPVFlagged = hybridEmulationInspect(firstAPV, digis);
  else if (inspectAlgo_ == "BaselineFollower")
    nAPVFlagged = baselineFollowerInspect(firstAPV, digis);
  else if (inspectAlgo_ == "AbnormalBaseline")
    nAPVFlagged = abnormalBaselineInspect(firstAPV, digis);
  else if (inspectAlgo_ == "Null")
    nAPVFlagged = nullInspect(firstAPV, digis);
  else if (inspectAlgo_ == "BaselineAndSaturation")
    nAPVFlagged = baselineAndSaturationInspect(firstAPV, digis);
  else if (inspectAlgo_ == "DerivativeFollower")
    nAPVFlagged = forceRestoreInspect(firstAPV, digis);
  else
    throw cms::Exception("Unregistered Inspect Algorithm")
        << "SiStripAPVRestorer possibilities: (Null), (AbnormalBaseline), (BaselineFollower), (BaselineAndSaturation), "
           "(DerivativeFollower), (Hybrid), (HybridEmulation)";
 
  // update boolean version of APV flags
  for (size_t i = 0; i < apvFlags_.size(); ++i) {
    apvFlagsBool_.push_back((!apvFlags_[i].empty()) && (!apvFlagsBoolOverride_[i]));
  }
 
  return nAPVFlagged;
}
 
void SiStripAPVRestorer::restore(uint16_t firstAPV, digivector_t& digis) {
  if (forceNoRestore_)
    return;
 
  for (uint16_t iAPV = firstAPV; iAPV < digis.size() / nTotStripsPerAPV + firstAPV; ++iAPV) {
    auto algoToUse = apvFlags_[iAPV];
    if (!algoToUse.empty()) {
      if (algoToUse == "Flat") {
        flatRestore(iAPV, firstAPV, digis);
      } else if (algoToUse == "BaselineFollower") {
        baselineFollowerRestore(iAPV, firstAPV, median_[iAPV], digis);
      } else if (algoToUse == "DerivativeFollower") {
        derivativeFollowerRestore(iAPV, firstAPV, digis);
      } else {
        throw cms::Exception("Unregistered Restore Algorithm")
            << "SiStripAPVRestorer possibilities: (Flat), (BaselineFollower), (DerivativeFollower)";
      }
    }
  }
}
 
// Inspect method implementations
 
inline uint16_t SiStripAPVRestorer::hybridFormatInspect(uint16_t firstAPV, const digivector_t& digis) {
  digivector_t singleAPVdigi;
  singleAPVdigi.reserve(nTotStripsPerAPV);
  uint16_t nAPVflagged = 0;
  for (uint16_t iAPV = firstAPV; iAPV < digis.size() / nTotStripsPerAPV + firstAPV; ++iAPV) {
    digimap_t smoothedmap;
    if (!badAPVs_[iAPV]) {
      uint16_t stripsPerAPV = 0;
      singleAPVdigi.clear();
      for (int16_t strip = (iAPV - firstAPV) * nTotStripsPerAPV; strip < (iAPV - firstAPV + 1) * nTotStripsPerAPV;
           ++strip) {
        const uint16_t adc = digis[strip];
        singleAPVdigi.push_back(adc);
        if (adc > 0)
          ++stripsPerAPV;
      }
 
      if (stripsPerAPV > 64) {
        flatRegionsFinder(singleAPVdigi, smoothedmap, iAPV);
        apvFlags_[iAPV] = restoreAlgo_;  //specify any algo to make the restore
        nAPVflagged++;
      }
    }
    smoothedMaps_.emplace_hint(smoothedMaps_.end(), iAPV, std::move(smoothedmap));
  }
  return nAPVflagged;
}
 
inline uint16_t SiStripAPVRestorer::baselineFollowerInspect(uint16_t firstAPV, const digivector_t& digis) {
  digivector_t singleAPVdigi;
  singleAPVdigi.reserve(nTotStripsPerAPV);
  uint16_t nAPVflagged = 0;
 
  auto itCMMap = std::end(meanCMmap_);
  if (useRealMeanCM_)
    itCMMap = meanCMmap_.find(detId_);
 
  for (uint16_t iAPV = firstAPV; iAPV < firstAPV + digis.size() / nTotStripsPerAPV; ++iAPV) {
    digimap_t smoothedmap;
    if (!badAPVs_[iAPV]) {
      float MeanAPVCM = meanCM_;
      if (useRealMeanCM_ && (std::end(meanCMmap_) != itCMMap))
        MeanAPVCM = itCMMap->second[iAPV];
 
      singleAPVdigi.clear();
      std::copy_n(std::begin(digis) + nTotStripsPerAPV * (iAPV - firstAPV),
                  nTotStripsPerAPV,
                  std::back_inserter(singleAPVdigi));
 
      const float DeltaCM = median_[iAPV] - MeanAPVCM;
      if ((DeltaCM < 0) && (std::abs(DeltaCM) > deltaCMThreshold_)) {
        if (!flatRegionsFinder(singleAPVdigi, smoothedmap, iAPV)) {
          apvFlags_[iAPV] = restoreAlgo_;  //specify any algo to make the restore
          ++nAPVflagged;
        }
      }
    }
    smoothedMaps_.emplace_hint(smoothedMaps_.end(), iAPV, std::move(smoothedmap));
  }
  return nAPVflagged;
}
 
inline uint16_t SiStripAPVRestorer::forceRestoreInspect(uint16_t firstAPV, const digivector_t& digis) {
  uint16_t nAPVflagged = 0;
  for (uint16_t iAPV = firstAPV; iAPV < firstAPV + digis.size() / nTotStripsPerAPV; ++iAPV) {
    if (!badAPVs_[iAPV]) {
      apvFlags_[iAPV] = restoreAlgo_;  //specify any algo to make the restore
      nAPVflagged++;
    }
  }
  return nAPVflagged;
}
 
inline uint16_t SiStripAPVRestorer::baselineAndSaturationInspect(uint16_t firstAPV, const digivector_t& digis) {
  digivector_t singleAPVdigi;
  singleAPVdigi.reserve(nTotStripsPerAPV);
  uint16_t nAPVflagged = 0;
 
  auto itCMMap = std::end(meanCMmap_);
  if (useRealMeanCM_)
    itCMMap = meanCMmap_.find(detId_);
 
  for (uint16_t iAPV = firstAPV; iAPV < firstAPV + digis.size() / nTotStripsPerAPV; ++iAPV) {
    if (!badAPVs_[iAPV]) {
      float MeanAPVCM = meanCM_;
      if (useRealMeanCM_ && (std::end(meanCMmap_) != itCMMap))
        MeanAPVCM = itCMMap->second[iAPV];
 
      singleAPVdigi.clear();
      uint16_t nSatStrip = 0;
      for (int16_t strip = (iAPV - firstAPV) * nTotStripsPerAPV; strip < (iAPV - firstAPV + 1) * nTotStripsPerAPV;
           ++strip) {
        const uint16_t digi = digis[strip];
        singleAPVdigi.push_back(digi);
        if (digi >= 1023)
          ++nSatStrip;
      }
 
      const float DeltaCM = median_[iAPV] - MeanAPVCM;
      if ((DeltaCM < 0) && (std::abs(DeltaCM) > deltaCMThreshold_) && (nSatStrip >= nSaturatedStrip_)) {
        apvFlags_[iAPV] = restoreAlgo_;  //specify any algo to make the restore
        ++nAPVflagged;
      }
    }
  }
  return nAPVflagged;
}
 
inline uint16_t SiStripAPVRestorer::abnormalBaselineInspect(uint16_t firstAPV, const digivector_t& digis) {
  SiStripQuality::Range detQualityRange = qualityHandle->getRange(detId_);
 
  uint16_t nAPVflagged = 0;
 
  auto itCMMap = std::end(meanCMmap_);
  if (useRealMeanCM_)
    itCMMap = meanCMmap_.find(detId_);
 
  int devCount = 0, qualityCount = 0, minstrip = 0;
  for (uint16_t iAPV = firstAPV; iAPV < firstAPV + digis.size() / nTotStripsPerAPV; ++iAPV) {
    if (!badAPVs_[iAPV]) {
      float MeanAPVCM = meanCM_;
      if (useRealMeanCM_ && (std::end(meanCMmap_) != itCMMap))
        MeanAPVCM = itCMMap->second[iAPV];
 
      for (uint16_t istrip = iAPV * nTotStripsPerAPV; istrip < (iAPV + 1) * nTotStripsPerAPV; ++istrip) {
        const auto fs = static_cast<int>(digis[istrip - firstAPV * nTotStripsPerAPV]);
        if (!qualityHandle->IsStripBad(detQualityRange, istrip)) {
          qualityCount++;
          if (std::abs(fs - MeanAPVCM) > static_cast<int>(deviation_)) {
            devCount++;
            minstrip = std::min(fs, minstrip);
          }
        }
      }
      if (devCount > fraction_ * qualityCount) {
        apvFlags_[iAPV] = restoreAlgo_;  //specify any algo to make the restore
        nAPVflagged++;
      }
    }
  }
  return nAPVflagged;
}
 
inline uint16_t SiStripAPVRestorer::nullInspect(uint16_t firstAPV, const digivector_t& digis) {
  SiStripQuality::Range detQualityRange = qualityHandle->getRange(detId_);
 
  uint16_t nAPVflagged = 0;
  for (uint16_t iAPV = firstAPV; iAPV < firstAPV + digis.size() / nTotStripsPerAPV; ++iAPV) {
    if (!badAPVs_[iAPV]) {
      int zeroCount = 0, qualityCount = 0;
      for (uint16_t istrip = iAPV * nTotStripsPerAPV; istrip < (iAPV + 1) * nTotStripsPerAPV; ++istrip) {
        const auto fs = static_cast<int>(digis[istrip - firstAPV * nTotStripsPerAPV]);
        if (!qualityHandle->IsStripBad(detQualityRange, istrip)) {
          qualityCount++;
          if (fs < 1)
            zeroCount++;
        }
      }
      if (zeroCount > restoreThreshold_ * qualityCount) {
        apvFlags_[iAPV] = restoreAlgo_;  //specify any algo to make the restore
        nAPVflagged++;
      }
    }
  }
  return nAPVflagged;
}
 
inline uint16_t SiStripAPVRestorer::hybridEmulationInspect(uint16_t firstAPV, const digivector_t& digis) {
  uint16_t nAPVflagged = 0;
 
  auto itCMMap = std::end(meanCMmap_);
  if (useRealMeanCM_)
    itCMMap = meanCMmap_.find(detId_);
 
  for (uint16_t iAPV = firstAPV; iAPV < firstAPV + digis.size() / nTotStripsPerAPV; ++iAPV) {
    if (!badAPVs_[iAPV]) {
      float MeanAPVCM = meanCM_;
      if (useRealMeanCM_ && (std::end(meanCMmap_) != itCMMap))
        MeanAPVCM = itCMMap->second[iAPV];
 
      const float DeltaCM = median_[iAPV] - (MeanAPVCM + 1024) / 2;
      if ((DeltaCM < 0) && (std::abs(DeltaCM) > deltaCMThreshold_ / 2)) {
        apvFlags_[iAPV] = "HybridEmulation";
        ++nAPVflagged;
      }
    }
  }
  return nAPVflagged;
}
 
// Restore method implementations
 
inline void SiStripAPVRestorer::baselineFollowerRestore(uint16_t apvN,
                                                        uint16_t firstAPV,
                                                        float median,
                                                        digivector_t& digis) {
  digivector_t baseline(size_t(nTotStripsPerAPV), 0);
 
  //============================= Find Flat Regions & Interpolating the baseline & subtracting the baseline  =================
  if (!smoothedMaps_.empty()) {
    auto itSmootedMap = smoothedMaps_.find(apvN);
    baselineFollower(itSmootedMap->second, baseline, median);
  } else {
    //median=0;
    digivector_t singleAPVdigi;
    singleAPVdigi.reserve(nTotStripsPerAPV);
    std::copy_n(
        std::begin(digis) + nTotStripsPerAPV * (apvN - firstAPV), nTotStripsPerAPV, std::back_inserter(singleAPVdigi));
    digimap_t smoothedpoints;
    flatRegionsFinder(singleAPVdigi, smoothedpoints, apvN);
    baselineFollower(smoothedpoints, baseline, median);
  }
 
  if (applyBaselineRejection_) {
    if (checkBaseline(baseline))
      apvFlagsBoolOverride_[apvN] = true;
  }
 
  //============================= subtracting the baseline =============================================
  for (int16_t itStrip = 0; itStrip < nTotStripsPerAPV; ++itStrip) {
    digis[nTotStripsPerAPV * (apvN - firstAPV) + itStrip] -= baseline[itStrip] - median;
  }
 
  //============================= storing baseline to the map =============================================
  baselineMap_.emplace_hint(baselineMap_.end(), apvN, std::move(baseline));
}
 
inline void SiStripAPVRestorer::flatRestore(uint16_t apvN, uint16_t firstAPV, digivector_t& digis) {
  digivector_t baseline(size_t(nTotStripsPerAPV), 150);
  baseline[0] = 0;
  baseline[nTotStripsPerAPV - 1] = 0;
 
  for (int16_t itStrip = 0; itStrip < nTotStripsPerAPV; ++itStrip) {
    digis[nTotStripsPerAPV * (apvN - firstAPV) + itStrip] = baseline[itStrip];
  }
  baselineMap_.emplace_hint(baselineMap_.end(), apvN, std::move(baseline));
}
 
// Baseline calculation implementation =========================================
bool inline SiStripAPVRestorer::flatRegionsFinder(const digivector_t& adcs, digimap_t& smoothedpoints, uint16_t apvN) {
  smoothedpoints.clear();
 
  SiStripNoises::Range detNoiseRange = noiseHandle->getRange(detId_);
 
  //============================= Height above local minimum ===============================
  std::vector<float> adcsLocalMinSubtracted(size_t(nTotStripsPerAPV), 0);
  for (uint32_t istrip = 0; istrip < nTotStripsPerAPV; ++istrip) {
    float localmin = 999.9;
    for (uint16_t jstrip = std::max(0, static_cast<int>(istrip - nSmooth_ / 2));
         jstrip < std::min((int)nTotStripsPerAPV, static_cast<int>(istrip + nSmooth_ / 2));
         ++jstrip) {
      const float nextvalue = adcs[jstrip];
      if (nextvalue < localmin)
        localmin = nextvalue;
    }
    adcsLocalMinSubtracted[istrip] = adcs[istrip] - localmin;
  }
 
  //============================= Find regions with stable slopes ========================
  digimap_t consecpoints;
  std::vector<uint16_t> nConsStrip;
  //Creating maps with all the neighborhood strip and putting in a nCosntStip vector how many we have
  uint16_t consecStrips = 0;
  for (uint32_t istrip = 0; istrip < nTotStripsPerAPV; ++istrip) {
    const int16_t adc = adcs[istrip];
    //if( adcsLocalMinSubtracted[istrip] < nSigmaNoiseDerTh_ * (float)noiseHandle->getNoise(istrip+apvN*128,detNoiseRange) && (adc - median) < hitStripThreshold_){
    if (adcsLocalMinSubtracted[istrip] <
        nSigmaNoiseDerTh_ * (float)noiseHandle->getNoiseFast(istrip + apvN * nTotStripsPerAPV, detNoiseRange)) {
      consecpoints.emplace_hint(consecpoints.end(), istrip, adc);
      ++consecStrips;
    } else if (consecStrips > 0) {
      nConsStrip.push_back(consecStrips);
      consecStrips = 0;
    }
  }
  //to cope with the last flat region of the APV
  if (consecStrips > 0)
    nConsStrip.push_back(consecStrips);
 
  //removing from the map the fist and last points in wide flat regions and erasing from the map too small regions
  auto itConsecpoints = consecpoints.begin();
  float MinSmoothValue = 20000., MaxSmoothValue = 0.;
  for (const auto consecStrips : nConsStrip) {
    if (consecStrips >= consecThreshold_) {
      ++itConsecpoints;  //skipping first point
      uint16_t nFirstStrip = itConsecpoints->first;
      uint16_t nLastStrip;
      float smoothValue = 0.0;
      float stripCount = 1;
      for (uint16_t n = 0; n < consecStrips - 2; ++n) {
        smoothValue += itConsecpoints->second;
        if (stripCount == consecThreshold_) {
          smoothValue /= (float)stripCount;
          nLastStrip = nFirstStrip + stripCount - 1;
          smoothedpoints.emplace_hint(smoothedpoints.end(), nFirstStrip, smoothValue);
          smoothedpoints.emplace_hint(smoothedpoints.end(), nLastStrip, smoothValue);
          if (smoothValue > MaxSmoothValue)
            MaxSmoothValue = smoothValue;
          if (smoothValue < MinSmoothValue)
            MinSmoothValue = smoothValue;
          nFirstStrip = nLastStrip + 1;
          smoothValue = 0;
          stripCount = 0;
        }
        ++stripCount;
        ++itConsecpoints;
      }
      ++itConsecpoints;  //and putting the pointer to the new seies of point
 
      if (stripCount > 1) {
        //if(smoothValue>0){
        --stripCount;
        smoothValue /= static_cast<float>(stripCount);
        nLastStrip = nFirstStrip + stripCount - 1;
        smoothedpoints.emplace_hint(smoothedpoints.end(), nFirstStrip, smoothValue);
        smoothedpoints.emplace_hint(smoothedpoints.end(), nLastStrip, smoothValue);
        if (smoothValue > MaxSmoothValue)
          MaxSmoothValue = smoothValue;
        if (smoothValue < MinSmoothValue)
          MinSmoothValue = smoothValue;
      }
    } else {
      for (int n = 0; n < consecStrips; ++n)
        ++itConsecpoints;
    }
  }
 
  if ((MaxSmoothValue - MinSmoothValue) > distortionThreshold_) {
    if (applyBaselineCleaner_)
      baselineCleaner(adcs, smoothedpoints, apvN);
    return false;
  }
  return true;
}
 
void inline SiStripAPVRestorer::baselineCleaner(const digivector_t& adcs, digimap_t& smoothedpoints, uint16_t apvN) {
  if (cleaningSequence_ == 0) {  //default sequence used up to now
    cleaner_HighSlopeChecker(smoothedpoints);
    cleaner_LocalMinimumAdder(adcs, smoothedpoints, apvN);
  } else if (cleaningSequence_ == 1) {
    cleaner_LocalMinimumAdder(adcs, smoothedpoints, apvN);
    cleaner_HighSlopeChecker(smoothedpoints);
    cleaner_MonotonyChecker(smoothedpoints);
  } else if (cleaningSequence_ == 2) {
    cleaner_HighSlopeChecker(smoothedpoints);
  } else if (cleaningSequence_ == 3) {
    cleaner_LocalMinimumAdder(adcs, smoothedpoints, apvN);
    cleaner_HighSlopeChecker(smoothedpoints);
  } else {
    cleaner_HighSlopeChecker(smoothedpoints);
    cleaner_LocalMinimumAdder(adcs, smoothedpoints, apvN);
  }
}
 
void inline SiStripAPVRestorer::cleaner_MonotonyChecker(digimap_t& smoothedpoints) {
  //Removing points without monotony
  //--------------------------------------------------------------------------------------------------
  if (smoothedpoints.size() < 3)
    return;
 
  auto it = smoothedpoints.begin();
  while (smoothedpoints.size() > 3 && it != --(--smoothedpoints.end())) {  //while we are not at the last point
    // get info about current and next points
    auto it2 = it;
    const float adc1 = it2->second;
    const float adc2 = (++it2)->second;
    const float adc3 = (++it2)->second;
 
    if ((adc2 - adc1) > hitStripThreshold_ && (adc2 - adc3) > hitStripThreshold_) {
      smoothedpoints.erase(--it2);
    } else {
      ++it;
    }
  }
}
 
void inline SiStripAPVRestorer::cleaner_LocalMinimumAdder(const digivector_t& adcs,
                                                          digimap_t& smoothedpoints,
                                                          uint16_t apvN) {
  SiStripNoises::Range detNoiseRange = noiseHandle->getRange(detId_);
  //inserting extra point is case of local minimum
  //--------------------------------------------------------------------------------------------------
  // these should be reset now for the point-insertion that follows
 
  if (smoothedpoints.size() >= 2) {
    for (auto it = smoothedpoints.begin(); it != --smoothedpoints.end(); ++it) {
      auto itNext = it;
      ++itNext;
      const float strip1 = it->first;
      const float strip2 = itNext->first;
      const float adc1 = it->second;
      const float adc2 = itNext->second;
      const float m = (adc2 - adc1) / (strip2 - strip1);
 
      //2,4
      if ((strip2 - strip1) > slopeX_ && std::abs(adc1 - adc2) > slopeY_) {
        float itStrip = 1;
        float strip = itStrip + strip1;
        while (strip < strip2) {
          const float adc = adcs[strip];
          const auto noise =
              static_cast<float>(noiseHandle->getNoiseFast(strip + apvN * nTotStripsPerAPV, detNoiseRange));
          if (adc < (adc1 + m * itStrip - 2 * noise)) {
            smoothedpoints.emplace_hint(itNext, strip, adc);
            ++it;
          }
          ++itStrip;
          ++strip;
        }
      }
    }
  }
 
  const uint16_t firstStripFlat = smoothedpoints.begin()->first;
  const uint16_t lastStripFlat = (--smoothedpoints.end())->first;
  const int16_t firstStripFlatADC = smoothedpoints.begin()->second;
  const int16_t lastStripFlatADC = (--smoothedpoints.end())->second;
  if (firstStripFlat > 3) {
    auto it = smoothedpoints.begin();
    float strip = 0;
    while (strip < firstStripFlat) {
      const float adc = adcs[strip];
      const auto noise = static_cast<float>(noiseHandle->getNoiseFast(strip + apvN * nTotStripsPerAPV, detNoiseRange));
      if (adc < (firstStripFlatADC - 2 * noise)) {
        smoothedpoints.emplace_hint(it, strip, adc);
        ++it;
      }
      ++strip;
    }
  }
  if (lastStripFlat < (nTotStripsPerAPV - 3)) {
    float strip = lastStripFlat + 1;
    while (strip < nTotStripsPerAPV) {
      const float adc = adcs[strip];
      const auto noise = static_cast<float>(noiseHandle->getNoiseFast(strip + apvN * nTotStripsPerAPV, detNoiseRange));
      if (adc < (lastStripFlatADC - 2 * noise)) {
        smoothedpoints.emplace_hint(smoothedpoints.end(), strip, adc);
      }
      ++strip;
    }
  }
}
 
void inline SiStripAPVRestorer::cleaner_HighSlopeChecker(digimap_t& smoothedpoints) {
  //Removing points in the slope is too high
  //----------------------------------------------------------------------------
  if (smoothedpoints.size() < 4)
    return;
 
  auto it = smoothedpoints.begin();
  while (smoothedpoints.size() > 2 && it != --smoothedpoints.end()) {  //while we are not at the last point
    //if(smoothedpoints.size() <2) break;
    // get info about current and next points
    auto itNext = it;
    ++itNext;
    const float strip1 = it->first;
    const float strip2 = itNext->first;
    const float adc1 = it->second;
    const float adc2 = itNext->second;
    const float m = (adc2 - adc1) / (strip2 - strip1);
 
    if (m > 2) {  // in case of large positive slope, remove next point and try again from same current point
      smoothedpoints.erase(itNext);
    } else if (m < -2) {  // in case of large negative slope, remove current point and either...
      // move to next point if we have reached the beginning (post-increment to avoid invalidating pointer during erase) or...
      if (it == smoothedpoints.begin())
        smoothedpoints.erase(it++);
      // try again from the previous point if we have not reached the beginning
      else
        smoothedpoints.erase(it--);
    } else {  // in case of a flat enough slope, continue on to the next point
      ++it;
    }
  }
}
 
void inline SiStripAPVRestorer::baselineFollower(const digimap_t& smoothedpoints,
                                                 digivector_t& baseline,
                                                 float median) {
  //if not enough points
  if (smoothedpoints.size() < minStripsToFit_) {
    baseline.insert(baseline.begin(), nTotStripsPerAPV, median);
  } else {
    baseline.assign(size_t(nTotStripsPerAPV), 0);
 
    const auto lastIt = --smoothedpoints.end();
    const uint16_t firstStripFlat = smoothedpoints.begin()->first;
    const uint16_t lastStripFlat = lastIt->first;
    const int16_t firstStripFlatADC = smoothedpoints.begin()->second;
    const int16_t lastStripFlatADC = lastIt->second;
 
    //adding here the costant line at the extremities
    baseline.erase(baseline.begin(), baseline.begin() + firstStripFlat);
    baseline.insert(baseline.begin(), firstStripFlat, firstStripFlatADC);
 
    baseline.erase(baseline.begin() + lastStripFlat, baseline.end());
    baseline.insert(baseline.end(), nTotStripsPerAPV - lastStripFlat, lastStripFlatADC);
 
    //IMPORTANT: the itSmoothedpointsEnd should be at least smaller than smoothedpoints.end() -1
    for (auto itSmoothedpoints = smoothedpoints.begin(); itSmoothedpoints != (--smoothedpoints.end());
         ++itSmoothedpoints) {
      auto itNextSmoothedpoints = itSmoothedpoints;
      ++itNextSmoothedpoints;
      const float strip1 = itSmoothedpoints->first;
      const float strip2 = itNextSmoothedpoints->first;
      const float adc1 = itSmoothedpoints->second;
      const float adc2 = itNextSmoothedpoints->second;
 
      baseline[strip1] = adc1;
      baseline[strip2] = adc2;
      const float m = (adc2 - adc1) / (strip2 - strip1);
      uint16_t itStrip = strip1 + 1;
      float stripadc = adc1 + m;
      while (itStrip < strip2) {
        baseline[itStrip] = stripadc;
        ++itStrip;
        stripadc += m;
      }
    }
  }
}
 
bool SiStripAPVRestorer::checkBaseline(const digivector_t& baseline) const {
  // The Savitzky-Golay (S-G) filter of any left length nL, right
  // length nR, and order m, and with an optional opt equals the
  // derivative order (0 for the magnitude, 1 for the first
  // derivative, etc.) can be calculated using the following
  // Mathematica code:
  //
  // SavitzkyGolay[m_?IntegerQ, {nL_?IntegerQ, nR_?IntegerQ},
  //   opt___] := Module[
  //   {a, d},
  //   d = If[opt === Null, 0, If[IntegerQ[opt], opt, 0]];
  //   a = Table[
  //     If[i == 0 && j == 0, 1, i^j], {i, -nL, nR}, {j, 0,
  //      m}]; (Inverse[Transpose[a].a].Transpose[a])[[d + 1]]];
  //
  // The following coefficients can be then calculated by:
  //
  // N[Join[Table[SavitzkyGolay[2, {k, 16}], {k, 0, 16}],
  //   Table[SavitzkyGolay[2, {16, k}], {k, 15, 0, -1}]]]
 
  // nLR = max(nL, nR)
  static const size_t savitzky_golay_n_l_r = 16;
  static const float savitzky_golay_coefficient[2 * savitzky_golay_n_l_r + 1][2 * savitzky_golay_n_l_r + 1] = {
      {0.422085,
       0.325077,
       0.23839,
       0.162023,
       0.0959752,
       0.0402477,
       -0.00515996,
       -0.0402477,
       -0.0650155,
       -0.0794634,
       -0.0835913,
       -0.0773994,
       -0.0608875,
       -0.0340557,
       0.00309598,
       0.0505676,
       0.108359},
      {0.315789,
       0.254902,
       0.19969,
       0.150155,
       0.106295,
       0.0681115,
       0.0356037,
       0.00877193,
       -0.0123839,
       -0.0278638,
       -0.0376677,
       -0.0417957,
       -0.0402477,
       -0.0330237,
       -0.0201238,
       -0.00154799,
       0.0227038,
       0.0526316},
      {0.234586,
       0.198496,
       0.165207,
       0.134719,
       0.107032,
       0.0821465,
       0.0600619,
       0.0407784,
       0.024296,
       0.0106148,
       -0.000265369,
       -0.00834439,
       -0.0136223,
       -0.0160991,
       -0.0157747,
       -0.0126493,
       -0.00672269,
       0.00200501,
       0.0135338},
      {0.172078,     0.153076,    0.135099,    0.118148,   0.102221,   0.0873206, 0.073445,
       0.0605947,    0.0487697,   0.0379699,   0.0281955,  0.0194463,  0.0117225, 0.00502392,
       -0.000649351, -0.00529733, -0.00892003, -0.0115174, -0.0130895, -0.0136364},
      {0.123659,  0.116431,   0.109144,    0.101798,    0.0943921,  0.0869268,  0.0794021,
       0.0718179, 0.0641743,  0.0564712,   0.0487087,   0.0408868,  0.0330054,  0.0250646,
       0.0170644, 0.00900473, 0.000885613, -0.00729294, -0.0155309, -0.0238283, -0.0321852},
      {0.0859684, 0.0868154,  0.0869565,   0.0863919,  0.0851214,  0.0831451, 0.080463,  0.0770751,
       0.0729814, 0.0681818,  0.0626765,   0.0564653,  0.0495483,  0.0419255, 0.0335968, 0.0245624,
       0.0148221, 0.00437606, -0.00677583, -0.0186335, -0.0311971, -0.0444664},
      {0.0565217, 0.0628458, 0.0680971,  0.0722756,   0.0753811,  0.0774139,  0.0783738, 0.0782609,
       0.0770751, 0.0748165, 0.071485,   0.0670807,   0.0616036,  0.0550536,  0.0474308, 0.0387352,
       0.0289667, 0.0181254, 0.00621118, -0.00677583, -0.0208357, -0.0359684, -0.0521739},
      {0.0334615, 0.0434281, 0.0521329, 0.0595759,  0.0657571,   0.0706765, 0.0743341,  0.07673,
       0.0778641, 0.0777364, 0.0763469, 0.0736957,  0.0697826,   0.0646078, 0.0581712,  0.0504728,
       0.0415126, 0.0312907, 0.0198069, 0.00706142, -0.00694588, -0.022215, -0.0387458, -0.0565385},
      {0.0153846, 0.0276923, 0.0386622,  0.0482943,  0.0565886,  0.0635452, 0.0691639, 0.0734448, 0.076388,
       0.0779933, 0.0782609, 0.0771906,  0.0747826,  0.0710368,  0.0659532, 0.0595318, 0.0517726, 0.0426756,
       0.0322408, 0.0204682, 0.00735786, -0.0070903, -0.0228763, -0.04,     -0.0584615},
      {0.001221,  0.0149451, 0.027326,  0.0383639,  0.0480586,   0.0564103,  0.0634188,  0.0690842, 0.0734066,
       0.0763858, 0.078022,  0.078315,  0.077265,   0.0748718,   0.0711355,  0.0660562,  0.0596337, 0.0518681,
       0.0427595, 0.0323077, 0.0205128, 0.00737485, -0.00710623, -0.0229304, -0.0400977, -0.0586081},
      {-0.00985222, 0.00463138, 0.0178098, 0.029683,  0.0402509, 0.0495137,   0.0574713,  0.0641236,  0.0694708,
       0.0735127,   0.0762494,  0.0776809, 0.0778073, 0.0766284, 0.0741442,   0.0703549,  0.0652604,  0.0588607,
       0.0511557,   0.0421456,  0.0318302, 0.0202097, 0.0072839, -0.00694708, -0.0224833, -0.0393247, -0.0574713},
      {-0.0184729, -0.00369458, 0.00984169, 0.0221359,   0.0331881,  0.0429982,  0.0515662,
       0.0588923,  0.0649762,   0.0698181,  0.073418,    0.0757758,  0.0768915,  0.0767652,
       0.0753968,  0.0727864,   0.0689339,  0.0638394,   0.0575028,  0.0499242,  0.0411035,
       0.0310408,  0.019736,    0.00718917, -0.00659972, -0.0216307, -0.0379037, -0.0554187},
      {-0.025139, -0.0103925,  0.00318873, 0.0156046,  0.0268552, 0.0369405, 0.0458605, 0.0536151,
       0.0602045, 0.0656285,   0.0698872,  0.0729806,  0.0749086, 0.0756714, 0.0752688, 0.0737009,
       0.0709677, 0.0670692,   0.0620054,  0.0557763,  0.0483818, 0.039822,  0.0300969, 0.0192065,
       0.0071508, -0.00607024, -0.0204566, -0.0360083, -0.0527253},
      {-0.0302419, -0.0157536, -0.00234785, 0.00997537, 0.021216,   0.0313741, 0.0404497, 0.0484427,
       0.0553532,  0.0611811,  0.0659264,   0.0695892,  0.0721695,  0.0736672, 0.0740823, 0.0734149,
       0.0716649,  0.0688324,  0.0649174,   0.0599198,  0.0538396,  0.0466769, 0.0384316, 0.0291038,
       0.0186934,  0.00720046, -0.00537502, -0.0190331, -0.0337736, -0.0495968},
      {-0.0340909, -0.0200147, -0.006937, 0.00514208,  0.0162226,  0.0263045, 0.0353878, 0.0434725,
       0.0505587,  0.0566463,  0.0617353, 0.0658257,   0.0689175,  0.0710107, 0.0721054, 0.0722014,
       0.0712989,  0.0693978,  0.0664981, 0.0625999,   0.057703,   0.0518076, 0.0449135, 0.0370209,
       0.0281297,  0.01824,    0.0073516, -0.00453534, -0.0174209, -0.031305, -0.0461877},
      {-0.0369318, -0.0233688, -0.0107221, 0.00100806, 0.0118218,   0.0217192,  0.0307001, 0.0387647,
       0.0459128,  0.0521444,  0.0574597,  0.0618585,  0.0653409,   0.0679069,  0.0695565, 0.0702896,
       0.0701063,  0.0690066,  0.0669905,  0.0640579,  0.0602089,   0.0554435,  0.0497617, 0.0431635,
       0.0356488,  0.0272177,  0.0178702,  0.0076063,  -0.00357405, -0.0156708, -0.028684, -0.0426136},
      {-0.038961, -0.025974,  -0.0138249,  -0.00251362, 0.00795978, 0.0175953, 0.026393,  0.0343527, 0.0414747,
       0.0477587, 0.0532049,  0.0578132,   0.0615836,   0.0645161,  0.0666108, 0.0678676, 0.0682866, 0.0678676,
       0.0666108, 0.0645161,  0.0615836,   0.0578132,   0.0532049,  0.0477587, 0.0414747, 0.0343527, 0.026393,
       0.0175953, 0.00795978, -0.00251362, -0.0138249,  -0.025974,  -0.038961},
      {-0.0426136, -0.028684, -0.0156708, -0.00357405, 0.0076063,  0.0178702,  0.0272177,  0.0356488,
       0.0431635,  0.0497617, 0.0554435,  0.0602089,   0.0640579,  0.0669905,  0.0690066,  0.0701063,
       0.0702896,  0.0695565, 0.0679069,  0.0653409,   0.0618585,  0.0574597,  0.0521444,  0.0459128,
       0.0387647,  0.0307001, 0.0217192,  0.0118218,   0.00100806, -0.0107221, -0.0233688, -0.0369318},
      {-0.0461877, -0.031305, -0.0174209, -0.00453534, 0.0073516, 0.01824,    0.0281297, 0.0370209,
       0.0449135,  0.0518076, 0.057703,   0.0625999,   0.0664981, 0.0693978,  0.0712989, 0.0722014,
       0.0721054,  0.0710107, 0.0689175,  0.0658257,   0.0617353, 0.0566463,  0.0505587, 0.0434725,
       0.0353878,  0.0263045, 0.0162226,  0.00514208,  -0.006937, -0.0200147, -0.0340909},
      {-0.0495968, -0.0337736, -0.0190331, -0.00537502, 0.00720046, 0.0186934, 0.0291038, 0.0384316,
       0.0466769,  0.0538396,  0.0599198,  0.0649174,   0.0688324,  0.0716649, 0.0734149, 0.0740823,
       0.0736672,  0.0721695,  0.0695892,  0.0659264,   0.0611811,  0.0553532, 0.0484427, 0.0404497,
       0.0313741,  0.021216,   0.00997537, -0.00234785, -0.0157536, -0.0302419},
      {-0.0527253, -0.0360083, -0.0204566, -0.00607024, 0.0071508, 0.0192065, 0.0300969, 0.039822,
       0.0483818,  0.0557763,  0.0620054,  0.0670692,   0.0709677, 0.0737009, 0.0752688, 0.0756714,
       0.0749086,  0.0729806,  0.0698872,  0.0656285,   0.0602045, 0.0536151, 0.0458605, 0.0369405,
       0.0268552,  0.0156046,  0.00318873, -0.0103925,  -0.025139},
      {-0.0554187, -0.0379037, -0.0216307, -0.00659972, 0.00718917, 0.019736,    0.0310408,
       0.0411035,  0.0499242,  0.0575028,  0.0638394,   0.0689339,  0.0727864,   0.0753968,
       0.0767652,  0.0768915,  0.0757758,  0.073418,    0.0698181,  0.0649762,   0.0588923,
       0.0515662,  0.0429982,  0.0331881,  0.0221359,   0.00984169, -0.00369458, -0.0184729},
      {-0.0574713, -0.0393247, -0.0224833, -0.00694708, 0.0072839, 0.0202097, 0.0318302, 0.0421456,  0.0511557,
       0.0588607,  0.0652604,  0.0703549,  0.0741442,   0.0766284, 0.0778073, 0.0776809, 0.0762494,  0.0735127,
       0.0694708,  0.0641236,  0.0574713,  0.0495137,   0.0402509, 0.029683,  0.0178098, 0.00463138, -0.00985222},
      {-0.0586081, -0.0400977, -0.0229304, -0.00710623, 0.00737485, 0.0205128, 0.0323077, 0.0427595, 0.0518681,
       0.0596337,  0.0660562,  0.0711355,  0.0748718,   0.077265,   0.078315,  0.078022,  0.0763858, 0.0734066,
       0.0690842,  0.0634188,  0.0564103,  0.0480586,   0.0383639,  0.027326,  0.0149451, 0.001221},
      {-0.0584615, -0.04,     -0.0228763, -0.0070903, 0.00735786, 0.0204682, 0.0322408, 0.0426756, 0.0517726,
       0.0595318,  0.0659532, 0.0710368,  0.0747826,  0.0771906,  0.0782609, 0.0779933, 0.076388,  0.0734448,
       0.0691639,  0.0635452, 0.0565886,  0.0482943,  0.0386622,  0.0276923, 0.0153846},
      {-0.0565385, -0.0387458, -0.022215, -0.00694588, 0.00706142, 0.0198069, 0.0312907, 0.0415126,
       0.0504728,  0.0581712,  0.0646078, 0.0697826,   0.0736957,  0.0763469, 0.0777364, 0.0778641,
       0.07673,    0.0743341,  0.0706765, 0.0657571,   0.0595759,  0.0521329, 0.0434281, 0.0334615},
      {-0.0521739, -0.0359684, -0.0208357, -0.00677583, 0.00621118, 0.0181254, 0.0289667, 0.0387352,
       0.0474308,  0.0550536,  0.0616036,  0.0670807,   0.071485,   0.0748165, 0.0770751, 0.0782609,
       0.0783738,  0.0774139,  0.0753811,  0.0722756,   0.0680971,  0.0628458, 0.0565217},
      {-0.0444664, -0.0311971, -0.0186335, -0.00677583, 0.00437606, 0.0148221, 0.0245624, 0.0335968,
       0.0419255,  0.0495483,  0.0564653,  0.0626765,   0.0681818,  0.0729814, 0.0770751, 0.080463,
       0.0831451,  0.0851214,  0.0863919,  0.0869565,   0.0868154,  0.0859684},
      {-0.0321852, -0.0238283, -0.0155309, -0.00729294, 0.000885613, 0.00900473, 0.0170644,
       0.0250646,  0.0330054,  0.0408868,  0.0487087,   0.0564712,   0.0641743,  0.0718179,
       0.0794021,  0.0869268,  0.0943921,  0.101798,    0.109144,    0.116431,   0.123659},
      {-0.0136364, -0.0130895, -0.0115174, -0.00892003, -0.00529733, -0.000649351, 0.00502392,
       0.0117225,  0.0194463,  0.0281955,  0.0379699,   0.0487697,   0.0605947,    0.073445,
       0.0873206,  0.102221,   0.118148,   0.135099,    0.153076,    0.172078},
      {0.0135338,
       0.00200501,
       -0.00672269,
       -0.0126493,
       -0.0157747,
       -0.0160991,
       -0.0136223,
       -0.00834439,
       -0.000265369,
       0.0106148,
       0.024296,
       0.0407784,
       0.0600619,
       0.0821465,
       0.107032,
       0.134719,
       0.165207,
       0.198496,
       0.234586},
      {0.0526316,
       0.0227038,
       -0.00154799,
       -0.0201238,
       -0.0330237,
       -0.0402477,
       -0.0417957,
       -0.0376677,
       -0.0278638,
       -0.0123839,
       0.00877193,
       0.0356037,
       0.0681115,
       0.106295,
       0.150155,
       0.19969,
       0.254902,
       0.315789},
      {0.108359,
       0.0505676,
       0.00309598,
       -0.0340557,
       -0.0608875,
       -0.0773994,
       -0.0835913,
       -0.0794634,
       -0.0650155,
       -0.0402477,
       -0.00515996,
       0.0402477,
       0.0959752,
       0.162023,
       0.23839,
       0.325077,
       0.422085}};
 
  float filtered_baseline[nTotStripsPerAPV];
  float filtered_baseline_derivative[nTotStripsPerAPV - 1];
 
  // Zero filtered_baseline
  memset(filtered_baseline, 0, nTotStripsPerAPV * sizeof(float));
  // Filter the left edge using (nL, nR) = (0, 16) .. (15, 16) S-G
  // filters
  for (size_t i = 0; i < savitzky_golay_n_l_r; i++) {
    for (size_t j = 0; j < savitzky_golay_n_l_r + 1 + i; j++) {
      filtered_baseline[i] += savitzky_golay_coefficient[i][j] * baseline[j];
    }
  }
  // Filter the middle section using the (nL, nR) = (16, 16) S-G
  // filter, while taking advantage of the symmetry to save 16
  // multiplications.
  for (size_t i = savitzky_golay_n_l_r; i < nTotStripsPerAPV - savitzky_golay_n_l_r; i++) {
    filtered_baseline[i] = savitzky_golay_coefficient[savitzky_golay_n_l_r][savitzky_golay_n_l_r] * baseline[i];
    for (size_t j = 0; j < savitzky_golay_n_l_r; j++) {
      filtered_baseline[i] += savitzky_golay_coefficient[savitzky_golay_n_l_r][j] *
                              (baseline[i + j - savitzky_golay_n_l_r] + baseline[i - j + savitzky_golay_n_l_r]);
    }
#if 0
  // Test that the indexing above is correct
  float test = 0;
  for (size_t j = 0; j < 2 * savitzky_golay_n_l_r + 1; j++) {
    test +=
        savitzky_golay_coefficient[savitzky_golay_n_l_r][j] *
        baseline[i + j - savitzky_golay_n_l_r];
  }
  // test == filtered_baseline[i] should hold now
#endif
  }
  // Filter the right edge using (nL, nR) = (16, 15) .. (16, 0) S-G
  // filters
  for (size_t i = nTotStripsPerAPV - savitzky_golay_n_l_r; i < nTotStripsPerAPV; i++) {
    for (size_t j = 0; j < nTotStripsPerAPV - i + savitzky_golay_n_l_r; j++) {
      filtered_baseline[i] += savitzky_golay_coefficient[2 * savitzky_golay_n_l_r + i + 1 - nTotStripsPerAPV][j] *
                              baseline[i + j - savitzky_golay_n_l_r];
    }
  }
  // In lieu of a spearate S-G derivative filter, the finite
  // difference is used here (since the output is sufficiently
  // smooth).
  for (size_t i = 0; i < (nTotStripsPerAPV - 1); i++) {
    filtered_baseline_derivative[i] = filtered_baseline[i + 1] - filtered_baseline[i];
  }
 
  // Calculate the maximum deviation between filtered and unfiltered
  // baseline, plus the sum square of the derivative.
 
  double filtered_baseline_max = 0;
  double filtered_baseline_derivative_sum_square = 0;
 
  for (size_t i = 0; i < nTotStripsPerAPV; i++) {
    const double d = filtered_baseline[i] - baseline[i];
 
    filtered_baseline_max = std::max(filtered_baseline_max, static_cast<double>(fabs(d)));
  }
  for (size_t i = 0; i < (nTotStripsPerAPV - 1); i++) {
    filtered_baseline_derivative_sum_square += filtered_baseline_derivative[i] * filtered_baseline_derivative[i];
  }
 
#if 0
  std::cerr << __FILE__ << ':' << __LINE__ << ": "
          << filtered_baseline_max << ' '
          << filtered_baseline_derivative_sum_square << std::endl;
#endif
 
  // Apply the cut
  return !(filtered_baseline_max >= filteredBaselineMax_ ||
           filtered_baseline_derivative_sum_square >= filteredBaselineDerivativeSumSquare_);
}
 
//Other methods implementation ==============================================
//==========================================================================
 
void SiStripAPVRestorer::loadMeanCMMap(const edm::Event& iEvent) {
  if (useRealMeanCM_) {
    edm::Handle<edm::DetSetVector<SiStripRawDigi>> input;
    iEvent.getByLabel("siStripDigis", "VirginRaw", input);
    createCMMapRealPed(*input);
  } else {
    edm::Handle<edm::DetSetVector<SiStripProcessedRawDigi>> inputCM;
    iEvent.getByLabel("MEANAPVCM", inputCM);
    createCMMapCMstored(*inputCM);
  }
}
void SiStripAPVRestorer::createCMMapRealPed(const edm::DetSetVector<SiStripRawDigi>& input) {
  meanCMmap_.clear();
  for (const auto& rawDigis : input) {
    const auto detPedestalRange = pedestalHandle->getRange(rawDigis.id);
    const size_t nAPVs = rawDigis.size() / nTotStripsPerAPV;
    std::vector<float> meanCMDetSet;
    meanCMDetSet.reserve(nAPVs);
    for (uint16_t iAPV = 0; iAPV < nAPVs; ++iAPV) {
      uint16_t minPed = nTotStripsPerAPV;
      for (uint16_t strip = nTotStripsPerAPV * iAPV; strip < nTotStripsPerAPV * (iAPV + 1); ++strip) {
        uint16_t ped = static_cast<uint16_t>(pedestalHandle->getPed(strip, detPedestalRange));
        if (ped < minPed)
          minPed = ped;
      }
      meanCMDetSet.push_back(minPed);
    }
    meanCMmap_.emplace(rawDigis.id, std::move(meanCMDetSet));
  }
}
void SiStripAPVRestorer::createCMMapCMstored(const edm::DetSetVector<SiStripProcessedRawDigi>& input) {
  meanCMmap_.clear();
  for (const auto& rawDigis : input) {
    std::vector<float> meanCMNValue;
    meanCMNValue.reserve(rawDigis.size());
    std::transform(
        std::begin(rawDigis), std::end(rawDigis), std::back_inserter(meanCMNValue), [](SiStripProcessedRawDigi cm) {
          return cm.adc();
        });
    meanCMmap_.emplace(rawDigis.id, std::move(meanCMNValue));
  }
}
 
//NEW algorithm designed for implementation in FW=============================
//============================================================================
void SiStripAPVRestorer::derivativeFollowerRestore(uint16_t apvN, uint16_t firstAPV, digivector_t& digis) {
  digivector_t singleAPVdigi;
  singleAPVdigi.clear();
  for (int16_t strip = (apvN - firstAPV) * nTotStripsPerAPV; strip < (apvN - firstAPV + 1) * nTotStripsPerAPV; ++strip)
    singleAPVdigi.push_back(digis[strip] + 1024);
 
  digimap_t discontinuities;  // it will contain the start and the end of each region in which a greadient is present
  discontinuities.clear();
 
  digimap_t::iterator itdiscontinuities;
 
  //----Variables of the first part---//
 
  bool isMinimumAndNoMax = false;
  bool isFirstStrip = false;
 
  //---Variables of the second part---//
 
  int actualStripADC = 0;
  int previousStripADC = 0;
 
  int greadient = 0;
  int maximum_value = 0;
  const uint32_t n_high_maximum_cluster = 1025 + 1024;
  int high_maximum_cluster = n_high_maximum_cluster;
  int number_good_minimum = 0;
  int first_gradient = 0;
  int strip_first_gradient = 0;
  int adc_start_point_cluster_pw = 0;
  int auxiliary_end_cluster = 0;
  int first_start_cluster_strip = 0;
  int first_start_cluster_ADC = 0;
  bool isAuxiliary_Minimum = false;
  bool isPossible_wrong_minimum = false;
  bool isMax = false;
 
  //----------SECOND PART: CLUSTER FINDING--------//
 
  for (uint16_t strip = 0; strip < singleAPVdigi.size(); ++strip) {
    if (strip == 0) {
      actualStripADC = singleAPVdigi[strip];
      if (std::abs(singleAPVdigi[strip] - singleAPVdigi[strip + 1]) > gradient_threshold_) {
        isFirstStrip = true;
        isMinimumAndNoMax = true;
        discontinuities.insert(discontinuities.end(), std::pair<int, int>(strip, actualStripADC));
      } else if (actualStripADC > (gradient_threshold_ + 1024)) {
        discontinuities.insert(discontinuities.end(), std::pair<uint16_t, int16_t>(strip, 0 + 1024));
        isMinimumAndNoMax = true;
        first_start_cluster_strip = strip;
        first_start_cluster_ADC = 1024;
      }
 
    } else {
      previousStripADC = actualStripADC;
      actualStripADC = singleAPVdigi[strip];
      greadient = actualStripADC - previousStripADC;
 
      if (((greadient > gradient_threshold_) && (!isMax) && (!isMinimumAndNoMax))) {
        isMax = false;
        if (((std::abs(maximum_value - previousStripADC) < (2 * gradient_threshold_)) &&
             discontinuities.size() > 1)) {  // add the || with the cluster size
          //to verify if the noise do not interfere and is detected fake hits
          isPossible_wrong_minimum = true;
          itdiscontinuities = --discontinuities.end();
          if (discontinuities.size() > 1) {
            --itdiscontinuities;
          }
          strip_first_gradient = itdiscontinuities->first;
          adc_start_point_cluster_pw = itdiscontinuities->second;
          first_gradient = std::abs(adc_start_point_cluster_pw - singleAPVdigi[strip_first_gradient + 1]);
          discontinuities.erase(++itdiscontinuities);
          discontinuities.erase(--discontinuities.end());
        }
 
        if ((discontinuities.size() % 2 == 1) && (!discontinuities.empty())) {  //&&(no_minimo == 0)
          discontinuities.erase(--discontinuities.end());
        }
 
        discontinuities.insert(discontinuities.end(), std::pair<uint16_t, int16_t>(strip - 1, previousStripADC));
        isMinimumAndNoMax = true;
        maximum_value = 0;
        first_start_cluster_strip = strip - 1;
        first_start_cluster_ADC = previousStripADC;
 
      } else if ((!isMax) && ((actualStripADC - previousStripADC < 0) && (isMinimumAndNoMax))) {
        isMax = true;
        isMinimumAndNoMax = false;
        high_maximum_cluster = n_high_maximum_cluster;
        if ((previousStripADC > maximum_value) && (discontinuities.size() % 2 == 1))
          maximum_value = previousStripADC;
      }
 
      if ((isMax) && (strip < (nTotStripsPerAPV - 2))) {
        if (high_maximum_cluster > (std::abs(singleAPVdigi[strip + 1] - actualStripADC))) {
          high_maximum_cluster = singleAPVdigi[strip + 1] - actualStripADC;
          auxiliary_end_cluster = strip + 2;
        } else {
          auxiliary_end_cluster = nTotStripsPerAPV - 1;
        }
      }
 
      if ((isMax) && ((actualStripADC - previousStripADC) >= 0) && (size_window_ > 0) &&
          (strip <= ((nTotStripsPerAPV - 1) - size_window_ - 1))) {
        number_good_minimum = 0;
        for (uint16_t wintry = 0; wintry <= size_window_; wintry++) {
          if (std::abs(singleAPVdigi[strip + wintry] - singleAPVdigi[strip + wintry + 1]) <= last_gradient_)
            ++number_good_minimum;
        }
        --number_good_minimum;
 
        if (size_window_ != number_good_minimum) {
          isMax = false;  // not Valid end Point
          isMinimumAndNoMax = true;
        }
 
      } else if ((isMax) && (strip > ((nTotStripsPerAPV - 1) - size_window_ - 1))) {
        isMax = true;
        isAuxiliary_Minimum = true;  //for minimums after strip 127-SW-1
      }
 
      if (!discontinuities.empty()) {
        itdiscontinuities = --discontinuities.end();
      }
 
      if ((isMax) && (actualStripADC <= first_start_cluster_ADC)) {
        if ((std::abs(first_start_cluster_ADC - singleAPVdigi[strip + 2]) > first_gradient) &&
            (isPossible_wrong_minimum)) {
          discontinuities.erase(itdiscontinuities);
          discontinuities.insert(discontinuities.end(),
                                 std::pair<int, int>(strip_first_gradient, adc_start_point_cluster_pw));
          discontinuities.insert(discontinuities.end(), std::pair<int, int>(strip, adc_start_point_cluster_pw));
        } else {
          if ((discontinuities.size() % 2 == 0) && (discontinuities.size() > 1)) {
            discontinuities.erase(--discontinuities.end());
          }
          discontinuities.insert(discontinuities.end(), std::pair<int, int>(strip, actualStripADC));
        }
        isMax = false;
        adc_start_point_cluster_pw = 0;
        isPossible_wrong_minimum = false;
        strip_first_gradient = 0;
        first_start_cluster_strip = 0;
        first_start_cluster_ADC = 0;
      }
 
      if ((isMax) && ((actualStripADC - previousStripADC) >= 0) &&
          (!isAuxiliary_Minimum)) {  //For the end Poit when strip >127-SW-1
        if ((std::abs(first_start_cluster_ADC - singleAPVdigi[strip + 1]) > first_gradient) &&
            (isPossible_wrong_minimum)) {
          discontinuities.erase(itdiscontinuities);
          discontinuities.insert(discontinuities.end(),
                                 std::pair<int, int>(strip_first_gradient, adc_start_point_cluster_pw));
        }
 
        if ((discontinuities.size() % 2 == 0) && (discontinuities.size() > 1)) {
          discontinuities.erase(--discontinuities.end());
        }
        discontinuities.insert(discontinuities.end(), std::pair<int, int>(strip - 1, previousStripADC));
        isMax = false;
        adc_start_point_cluster_pw = 0;
        isPossible_wrong_minimum = false;
        strip_first_gradient = 0;
        first_start_cluster_strip = 0;
        first_start_cluster_ADC = 0;
      }
    }
  }
 
  //----------THIRD PART reconstruction of the event without baseline-------//
 
  if (!discontinuities.empty()) {
    if ((first_start_cluster_strip) == (nTotStripsPerAPV - 1) - 1)
      discontinuities.insert(discontinuities.end(),
                             std::pair<int, int>((nTotStripsPerAPV - 1), first_start_cluster_ADC));
    if ((isMax) && (isAuxiliary_Minimum))
      discontinuities.insert(discontinuities.end(),
                             std::pair<int, int>(auxiliary_end_cluster, first_start_cluster_ADC));
  }
 
  if (isFirstStrip) {
    itdiscontinuities = discontinuities.begin();
    ++itdiscontinuities;
    ++itdiscontinuities;
    int firstADC = itdiscontinuities->second;
    --itdiscontinuities;
    itdiscontinuities->second = firstADC;
    --itdiscontinuities;
    itdiscontinuities->second = firstADC;
  }
 
  if (!discontinuities.empty()) {
    itdiscontinuities = discontinuities.begin();
    uint16_t firstStrip = itdiscontinuities->first;
    int16_t firstADC = itdiscontinuities->second;
    ++itdiscontinuities;
    uint16_t lastStrip = itdiscontinuities->first;
    int16_t secondADC = itdiscontinuities->second;
    ++itdiscontinuities;
 
    for (uint16_t strip = 0; strip < nTotStripsPerAPV; ++strip) {
      if (strip > lastStrip && itdiscontinuities != discontinuities.end()) {
        firstStrip = itdiscontinuities->first;
        firstADC = itdiscontinuities->second;
        ++itdiscontinuities;
        lastStrip = itdiscontinuities->first;
        secondADC = itdiscontinuities->second;
        ++itdiscontinuities;
      }
 
      if ((firstStrip <= strip) && (strip <= lastStrip) &&
          (0 < (singleAPVdigi[strip] - firstADC -
                ((secondADC - firstADC) / (lastStrip - firstStrip)) * (strip - firstStrip) - gradient_threshold_))) {
        digis[(apvN - firstAPV) * nTotStripsPerAPV + strip] =
            singleAPVdigi[strip] - firstADC -
            (((secondADC - firstADC) / (lastStrip - firstStrip)) * (strip - firstStrip));
        edm::LogWarning("NoBaseline") << "No baseline " << digis[(apvN - firstAPV) * nTotStripsPerAPV + strip] << "\n";
      } else {
        digis[(apvN - firstAPV) * nTotStripsPerAPV + strip] = 0;
      }
    }
  }
}