Merge pull request #207 from githubdoe/fix_histogram_crash

Fixed bug in pixelstats.cpp that was causing intermittent crash

Author: gr5

pixelstats.cpp

@@ -493,11 +493,8 @@ void  pixelStats::updateHisto(){
     ui->histo->detachItems( QwtPlotItem::Rtti_PlotCurve);
     ui->histo->detachItems( QwtPlotItem::Rtti_PlotMarker);
     ui->histo->detachItems(QwtPlotItem::Rtti_PlotItem);
-    // Quantize the hue to 30 levels
-    // and the saturation to 32 levels
-    int hbins = 1000, sbins = 32;
-    int histSize[] = {hbins, sbins};
-    // hue varies from 0 to 179, see cvtColor
+    int hbins = 1000; // make histogram with 1000 bins
+    int histSize[] = {hbins};
 
 
     cv::Mat hist;
@@ -510,7 +507,7 @@ void  pixelStats::updateHisto(){
 
     float hranges[] = { (float)m_wf->min, (float)m_wf->max};
     const float* ranges[] = { hranges };
-    int channels[] = {0, 1};
+    int channels[] = { 0 };
     cv::calcHist( &values, 1, channels, m_wf->workMask, // do not use mask
              hist, 1, histSize, ranges,
              true, // the histogram is uniform