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Added comments to clarify sample code

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Program flow is not easily apparent so hopefully ANY comments in the code could help new users.
This commit is contained in:
ggargov 2016-01-06 13:46:49 -08:00 committed by Maksim Shabunin
parent 44bda8fbb7
commit 83b36bfd79
1 changed files with 5 additions and 2 deletions
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7
samples/cpp/camshiftdemo.cpp
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@ -20,6 +20,7 @@ Point origin;
Rect selection; Rect selection;
int vmin = 10, vmax = 256, smin = 30; int vmin = 10, vmax = 256, smin = 30;
// User draws box around object to track. This triggers CAMShift to start tracking
static void onMouse( int event, int x, int y, int, void* ) static void onMouse( int event, int x, int y, int, void* )
{ {
if( selectObject ) if( selectObject )
@ -42,7 +43,7 @@ static void onMouse( int event, int x, int y, int, void* )
case EVENT_LBUTTONUP: case EVENT_LBUTTONUP:
selectObject = false; selectObject = false;
if( selection.width > 0 && selection.height > 0 ) if( selection.width > 0 && selection.height > 0 )
trackObject = -1; trackObject = -1; // Set up CAMShift properties in main() loop
break; break;
} }
} }
@ -133,12 +134,13 @@ int main( int argc, const char** argv )
if( trackObject < 0 ) if( trackObject < 0 )
{ {
// Object has been selected by user, set up CAMShift search properties once
Mat roi(hue, selection), maskroi(mask, selection); Mat roi(hue, selection), maskroi(mask, selection);
calcHist(&roi, 1, 0, maskroi, hist, 1, &hsize, &phranges); calcHist(&roi, 1, 0, maskroi, hist, 1, &hsize, &phranges);
normalize(hist, hist, 0, 255, NORM_MINMAX); normalize(hist, hist, 0, 255, NORM_MINMAX);
trackWindow = selection; trackWindow = selection;
trackObject = 1; trackObject = 1; // Don't set up again, unless user selects new ROI
histimg = Scalar::all(0); histimg = Scalar::all(0);
int binW = histimg.cols / hsize; int binW = histimg.cols / hsize;
@ -156,6 +158,7 @@ int main( int argc, const char** argv )
} }
} }
// Perform CAMShift
calcBackProject(&hue, 1, 0, hist, backproj, &phranges); calcBackProject(&hue, 1, 0, hist, backproj, &phranges);
backproj &= mask; backproj &= mask;
RotatedRect trackBox = CamShift(backproj, trackWindow, RotatedRect trackBox = CamShift(backproj, trackWindow,