void ElutionPeakDetection::smoothData(MassTrace& mt, int win_size) const
{
// alternative smoothing using SavitzkyGolay
// looking at the unit test, this method gives better fits than lowess smoothing
// reference paper uses lowess smoothing
MSSpectrum<PeakType> spectrum;
spectrum.insert(spectrum.begin(), mt.begin(), mt.end());
SavitzkyGolayFilter sg;
Param param;
param.setValue("polynomial_order", 2);
param.setValue("frame_length", std::max(3, win_size)); // frame length must be at least polynomial_order+1, otherwise SG will fail
sg.setParameters(param);
sg.filter(spectrum);
MSSpectrum<PeakType>::iterator iter = spectrum.begin();
std::vector<double> smoothed_intensities;
for (; iter != spectrum.end(); ++iter)
{
smoothed_intensities.push_back(iter->getIntensity());
}
mt.setSmoothedIntensities(smoothed_intensities);
//alternative end
// std::cout << "win_size elution: " << scan_time << " " << win_size << std::endl;
// if there is no previous FWHM estimation... do it now
// if (win_size == 0)
// {
// mt.estimateFWHM(false); // estimate FWHM
// win_size = mt.getFWHMScansNum();
// }
// use one global window size for all mass traces to smooth
// std::vector<double> rts, ints;
//
// for (MassTrace::const_iterator c_it = mt.begin(); c_it != mt.end(); ++c_it)
// {
// rts.push_back(c_it->getRT());
// ints.push_back(c_it->getIntensity());
// }
// LowessSmoothing lowess_smooth;
// Param lowess_params;
// lowess_params.setValue("window_size", win_size);
// lowess_smooth.setParameters(lowess_params);
// std::vector<double> smoothed_data;
// lowess_smooth.smoothData(rts, ints, smoothed_data);
// mt.setSmoothedIntensities(smoothed_data);
}
double ElutionPeakDetection::computeMassTraceSNR(const MassTrace& tr)
{
double snr(0.0);
if (tr.getSize() > 0)
{
double noise_area = computeMassTraceNoise(tr) * tr.getTraceLength();
double signal_area = tr.computePeakArea();
snr = signal_area / noise_area;
}
// std::cout << "snr " << snr << " ";
return snr;
}
double ElutionPeakDetection::computeApexSNR(const MassTrace& tr)
{
double noise_level(computeMassTraceNoise(tr));
double snr = 0;
if (noise_level > 0.0)
{
double smoothed_apex_int(tr.getMaxIntensity(true));
snr = smoothed_apex_int / noise_level;
}
// std::cout << "snr " << snr << " ";
return snr;
}
double ElutionPeakDetection::computeMassTraceNoise(const MassTrace& tr)
{
// compute RMSE
double squared_sum(0.0);
std::vector<double> smooth_ints(tr.getSmoothedIntensities());
for (Size i = 0; i < smooth_ints.size(); ++i)
{
squared_sum += (tr[i].getIntensity() - smooth_ints[i]) * (tr[i].getIntensity() - smooth_ints[i]);
}
double rmse(0.0);
if (!smooth_ints.empty())
{
rmse = std::sqrt(squared_sum / smooth_ints.size());
}
return rmse;
}
void ElutionPeakDetection::detectElutionPeaks_(MassTrace& mt, std::vector<MassTrace>& single_mtraces)
{
//smooth data
//std::vector<double> smoothed_data;
// Size win_size = mt.getFWHMScansNum();
double scan_time(mt.getAverageMS1CycleTime());
Size win_size = std::ceil(chrom_fwhm_ / scan_time);
// add smoothed data (original data is still accessible)
smoothData(mt, static_cast<Int>(win_size));
// debug intensities
// Size i = 0;
// std::cout << "*****" << std::endl;
// for (MassTrace::const_iterator mt_it = mt.begin(); mt_it != mt.end(); ++mt_it)
// {
// std::cout << mt_it->getIntensity() << " " << smoothed_data[i] << std::endl;
// ++i;
// }
//std::cout << "*****" << std::endl;
std::vector<Size> maxes, mins;
findLocalExtrema(mt, win_size / 2, maxes, mins);
// if only one maximum exists: finished!
if (maxes.size() == 1)
{
bool pw_ok = true;
bool snr_ok = true;
// check mass trace filter criteria (if enabled)
if (pw_filtering_ == "fixed")
{
double act_fwhm(mt.estimateFWHM(true));
// std::cout << "act_fwhm: " << act_fwhm << " ";
if (act_fwhm < min_fwhm_ || act_fwhm > max_fwhm_)
{
pw_ok = false;
}
// std::cout << pw_ok << std::endl;
}
if (mt_snr_filtering_)
{
if (computeApexSNR(mt) < chrom_peak_snr_)
{
snr_ok = false;
}
}
if (pw_ok && snr_ok)
{
mt.updateSmoothedMaxRT();
if (pw_filtering_ != "fixed")
{
mt.estimateFWHM(true);
}
// check for minimum/maximum trace length
// double mt_length(std::fabs(mt.rbegin()->getRT() - mt.begin()->getRT()));
// if ((mt_length >= min_trace_length_) && (mt_length <= max_trace_length_))
// if (mt_quality >= 1.2)
// {
#ifdef _OPENMP
#pragma omp critical (OPENMS_ElutionPeakDetection_mtraces)
#endif
single_mtraces.push_back(mt);
}
}
else if (maxes.empty())
{
return;
}
else // split mt to sub-traces
{
MassTrace::const_iterator cp_it = mt.begin();
Size last_idx(0);
// add last data point as last minimum (to grep the last chunk of the MT)
mins.push_back(mt.getSize() - 1);
for (Size min_idx = 0; min_idx < mins.size(); ++min_idx)
{
// copy sub-trace between cp_it and split point
std::vector<PeakType> tmp_mt;
std::vector<double> smoothed_tmp;
while (last_idx <= mins[min_idx])
{
tmp_mt.push_back(*cp_it);
smoothed_tmp.push_back(mt.getSmoothedIntensities()[last_idx]);
++cp_it;
++last_idx;
}
// check if
// if (tmp_mt.size() >= win_size / 2)
// {
MassTrace new_mt(tmp_mt);
// copy smoothed int's
new_mt.setSmoothedIntensities(smoothed_tmp);
// check filter criteria
bool pw_ok = true;
bool snr_ok = true;
// check mass trace filter criteria (if enabled)
if (pw_filtering_ == "fixed")
{
double act_fwhm(new_mt.estimateFWHM(true));
// std::cout << "act_fwhm: " << act_fwhm << " ";
if (act_fwhm < min_fwhm_ || act_fwhm > max_fwhm_)
{
pw_ok = false;
}
// std::cout << pw_ok << std::endl;
}
if (mt_snr_filtering_)
{
if (computeApexSNR(mt) < chrom_peak_snr_)
{
snr_ok = false;
}
}
if (pw_ok && snr_ok)
{
// set label of sub-trace
new_mt.setLabel(mt.getLabel() + "." + String(min_idx + 1));
//new_mt.updateWeightedMeanRT();
new_mt.updateSmoothedMaxRT();
//new_mt.updateSmoothedWeightedMeanRT();
new_mt.updateWeightedMeanMZ();
new_mt.updateWeightedMZsd();
if (pw_filtering_ != "fixed")
{
new_mt.estimateFWHM(true);
}
// double mt_quality(computeApexSNR(new_mt));
// double new_mt_length(std::fabs(new_mt.rbegin()->getRT() - new_mt.begin()->getRT()));
// if ((new_mt_length >= min_trace_length_) && (new_mt_length <= max_trace_length_))
//{
#ifdef _OPENMP
#pragma omp critical (OPENMS_ElutionPeakDetection_mtraces)
#endif
single_mtraces.push_back(new_mt);
}
// }
}
}
return;
}
void ElutionPeakDetection::findLocalExtrema(const MassTrace& tr, const Size& num_neighboring_peaks, std::vector<Size>& chrom_maxes, std::vector<Size>& chrom_mins)
{
std::vector<double> smoothed_ints_vec(tr.getSmoothedIntensities());
Size mt_length(smoothed_ints_vec.size());
if (mt_length != tr.getSize())
{
throw Exception::InvalidValue(__FILE__, __LINE__, __PRETTY_FUNCTION__, "MassTrace was not smoothed before! Aborting...", String(smoothed_ints_vec.size()));
}
// first make sure that everything is cleared
chrom_maxes.clear();
chrom_mins.clear();
// Extract RTs from the chromatogram and store them into into vectors for index access
// std::cout << "neighboring peaks: " << num_neighboring_peaks << std::endl;
// Store indices along with smoothed_ints to keep track of the peak order
std::multimap<double, Size> intensity_indices;
boost::dynamic_bitset<> used_idx(mt_length);
for (Size i = 0; i < mt_length; ++i)
{
intensity_indices.insert(std::make_pair(smoothed_ints_vec[i], i));
}
for (std::multimap<double, Size>::const_iterator c_it = intensity_indices.begin(); c_it != intensity_indices.end(); ++c_it)
{
double ref_int = c_it->first;
Size ref_idx = c_it->second;
if (!(used_idx[ref_idx]) && ref_int > 0.0)
{
bool real_max = true;
// iterate up the RT
Size start_idx(0);
if (ref_idx > num_neighboring_peaks)
{
start_idx = ref_idx - num_neighboring_peaks;
}
Size end_idx = ref_idx + num_neighboring_peaks;
if (end_idx > mt_length)
{
end_idx = mt_length;
}
for (Size j = start_idx; j < end_idx; ++j)
{
if (used_idx[j])
{
real_max = false;
break;
}
if (j == ref_idx)
{
continue;
}
if (smoothed_ints_vec[j] > ref_int)
{
real_max = false;
}
}
if (real_max)
{
chrom_maxes.push_back(ref_idx);
for (Size j = start_idx; j < end_idx; ++j)
{
used_idx[j] = true;
}
}
}
}
std::sort(chrom_maxes.begin(), chrom_maxes.end());
if (chrom_maxes.size() > 1)
{
Size i(0), j(1);
//for (Size i = 0; i < chrom_maxes.size() - 1; ++i)
while (i < j && j < chrom_maxes.size())
{
// bisection
Size left_bound(chrom_maxes[i] + 1);
Size right_bound(chrom_maxes[j] - 1);
while ((left_bound + 1) < right_bound)
{
double mid_dist((right_bound - left_bound) / 2.0);
Size mid_element_idx(left_bound + std::floor(mid_dist));
double mid_element_int = smoothed_ints_vec[mid_element_idx];
if (mid_element_int <= smoothed_ints_vec[mid_element_idx + 1])
{
right_bound = mid_element_idx;
}
else // or to the right...
{
left_bound = mid_element_idx;
}
}
Size min_rt((smoothed_ints_vec[left_bound] < smoothed_ints_vec[right_bound]) ? left_bound : right_bound);
// check for valley depth between chromatographic peaks
double min_int(1.0);
if (smoothed_ints_vec[min_rt] > min_int)
{
min_int = smoothed_ints_vec[min_rt];
}
double left_max_int(smoothed_ints_vec[chrom_maxes[i]]);
double right_max_int(smoothed_ints_vec[chrom_maxes[j]]);
double left_rt(tr[chrom_maxes[i]].getRT());
double mid_rt(tr[min_rt].getRT());
double right_rt(tr[chrom_maxes[j]].getRT());
double left_dist(std::fabs(mid_rt - left_rt));
double right_dist(std::fabs(right_rt - mid_rt));
double min_dist(min_fwhm_ / 2.0);
// out debug info
// std::cout << tr.getLabel() << ": i,j " << i << "," << j << ":" << left_max_int << " min: " << min_int << " " << right_max_int << " l " << left_rt << " r " << right_rt << " m " << mid_rt << std::endl;
if (left_max_int / min_int >= 2.0
&& right_max_int / min_int >= 2.0
&& left_dist >= min_dist
&& right_dist >= min_dist)
{
chrom_mins.push_back(min_rt);
// std::cout << "min added!" << std::endl;
i = j;
++j;
}
else
{
// keep one of the chrom_maxes, iterate the other
if (left_max_int > right_max_int)
{
++j;
}
else
{
i = j;
++j;
}
}
// chrom_mins.push_back(min_rt);
}
}
return;
}
void ElutionPeakDetection::detectElutionPeaks_(MassTrace & mt, std::vector<MassTrace> & single_mtraces)
{
std::vector<DoubleReal> rts, ints;
for (MassTrace::const_iterator c_it = mt.begin(); c_it != mt.end(); ++c_it)
{
rts.push_back(c_it->getRT());
ints.push_back(c_it->getIntensity());
}
std::vector<DoubleReal> smoothed_data;
LowessSmoothing lowess_smooth;
Param lowess_params;
// use dynamically computed window sizes
// Size win_size = mt.getFWHMScansNum();
// use one global window size for all mass traces to smooth
DoubleReal scan_time(mt.getScanTime());
Size win_size = std::ceil(chrom_fwhm_ / scan_time);
// std::cout << "win_size elution: " << scan_time << " " << win_size << std::endl;
// if there is no previous FWHM estimation... do it now
// if (win_size == 0)
// {
// mt.estimateFWHM(false); // estimate FWHM
// win_size = mt.getFWHMScansNum();
// }
lowess_params.setValue("window_size", win_size);
lowess_smooth.setParameters(lowess_params);
lowess_smooth.smoothData(rts, ints, smoothed_data);
mt.setSmoothedIntensities(smoothed_data);
// debug intensities
// Size i = 0;
// std::cout << "*****" << std::endl;
// for (MassTrace::const_iterator mt_it = mt.begin(); mt_it != mt.end(); ++mt_it)
// {
// std::cout << mt_it->getIntensity() << " " << smoothed_data[i] << std::endl;
// ++i;
// }
//std::cout << "*****" << std::endl;
std::vector<Size> maxes, mins;
// mt.findLocalExtrema(win_size / 2, maxes, mins);
findLocalExtrema(mt, win_size/2, maxes, mins);
// if only one maximum exists: finished!
if (maxes.size() == 1)
{
bool pw_ok = true;
bool snr_ok = true;
// check mass trace filter criteria (if enabled)
if (pw_filtering_ == "fixed")
{
DoubleReal act_fwhm(mt.estimateFWHM(true));
// std::cout << "act_fwhm: " << act_fwhm << " ";
if (act_fwhm < min_fwhm_ || act_fwhm > max_fwhm_)
{
pw_ok = false;
}
// std::cout << pw_ok << std::endl;
}
if (mt_snr_filtering_)
{
if (computeApexSNR(mt) < chrom_peak_snr_)
{
snr_ok = false;
}
}
if (pw_ok && snr_ok)
{
mt.updateSmoothedMaxRT();
if (pw_filtering_ != "fixed")
{
mt.estimateFWHM(true);
}
// check for minimum/maximum trace length
// DoubleReal mt_length(std::fabs(mt.rbegin()->getRT() - mt.begin()->getRT()));
// if ((mt_length >= min_trace_length_) && (mt_length <= max_trace_length_))
// if (mt_quality >= 1.2)
// {
#ifdef _OPENMP
#pragma omp critical
#endif
single_mtraces.push_back(mt);
}
}
else if (maxes.empty())
{
return;
}
else // split mt to subtraces
{
MassTrace::const_iterator cp_it = mt.begin();
Size last_idx(0);
for (Size min_idx = 0; min_idx < mins.size(); ++min_idx)
{
// copy subtrace between cp_it and splitpoint
std::vector<PeakType> tmp_mt;
std::vector<DoubleReal> smoothed_tmp;
while (last_idx <= mins[min_idx])
{
tmp_mt.push_back(*cp_it);
smoothed_tmp.push_back(mt.getSmoothedIntensities()[last_idx]);
++cp_it;
++last_idx;
}
// check if
// if (tmp_mt.size() >= win_size / 2)
// {
DoubleReal scantime(mt.getScanTime());
MassTrace new_mt(tmp_mt, scantime);
// copy smoothed ints
new_mt.setSmoothedIntensities(smoothed_tmp);
// check filter criteria
bool pw_ok = true;
bool snr_ok = true;
// check mass trace filter criteria (if enabled)
if (pw_filtering_ == "fixed")
{
DoubleReal act_fwhm(new_mt.estimateFWHM(true));
// std::cout << "act_fwhm: " << act_fwhm << " ";
if (act_fwhm < min_fwhm_ || act_fwhm > max_fwhm_)
{
pw_ok = false;
}
// std::cout << pw_ok << std::endl;
}
if (mt_snr_filtering_)
{
if (computeApexSNR(mt) < chrom_peak_snr_)
{
snr_ok = false;
}
}
if (pw_ok && snr_ok)
{
// set label of subtrace
String tr_num;
std::stringstream read_in;
read_in << (min_idx + 1);
tr_num = "." + read_in.str();
new_mt.setLabel(mt.getLabel() + tr_num);
//new_mt.updateWeightedMeanRT();
new_mt.updateSmoothedMaxRT();
//new_mt.updateSmoothedWeightedMeanRT();
new_mt.updateWeightedMeanMZ();
new_mt.updateWeightedMZsd();
if (pw_filtering_ != "fixed")
{
new_mt.estimateFWHM(true);
}
// DoubleReal mt_quality(computeApexSNR(new_mt));
// DoubleReal new_mt_length(std::fabs(new_mt.rbegin()->getRT() - new_mt.begin()->getRT()));
// if ((new_mt_length >= min_trace_length_) && (new_mt_length <= max_trace_length_))
//{
#ifdef _OPENMP
#pragma omp critical
#endif
single_mtraces.push_back(new_mt);
}
// }
}
// don't forget the trailing trace
std::vector<PeakType> tmp_mt;
std::vector<DoubleReal> smoothed_tmp;
while (last_idx < mt.getSize())
{
tmp_mt.push_back(*cp_it);
smoothed_tmp.push_back(mt.getSmoothedIntensities()[last_idx]);
++cp_it;
++last_idx;
}
// if (tmp_mt.size() >= win_size / 2)
// {
DoubleReal scantime(mt.getScanTime());
MassTrace new_mt(tmp_mt, scantime);
// copy smoothed ints
new_mt.setSmoothedIntensities(smoothed_tmp);
// check filter criteria
bool pw_ok = true;
bool snr_ok = true;
// check mass trace filter criteria (if enabled)
if (pw_filtering_ == "fixed")
{
DoubleReal act_fwhm(new_mt.estimateFWHM(true));
// std::cout << "act_fwhm: " << act_fwhm << " ";
if (act_fwhm < min_fwhm_ || act_fwhm > max_fwhm_)
{
pw_ok = false;
}
// std::cout << pw_ok << std::endl;
}
if (mt_snr_filtering_)
{
if (computeApexSNR(mt) < chrom_peak_snr_)
{
snr_ok = false;
}
}
if (pw_ok && snr_ok)
{
// set label of subtrace
String tr_num;
std::stringstream read_in;
read_in << (mins.size() + 1);
tr_num = "." + read_in.str();
new_mt.setLabel(mt.getLabel() + tr_num);
new_mt.updateSmoothedMaxRT();
new_mt.updateWeightedMeanMZ();
new_mt.updateWeightedMZsd();
if (pw_filtering_ != "fixed")
{
new_mt.estimateFWHM(true);
}
// DoubleReal mt_quality(computeApexSNR(new_mt));
// DoubleReal mt_length(std::fabs(new_mt.rbegin()->getRT() - new_mt.begin()->getRT()));
// if ((mt_length >= min_trace_length_) && (mt_length <= max_trace_length_))
// {
#ifdef _OPENMP
#pragma omp critical
#endif
single_mtraces.push_back(new_mt);
}
// }
}
return;
}
