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added extra check to avoid crashes

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This commit is contained in:
Vadim Pisarevsky 2011-04-29 10:34:54 +00:00
parent 06b233bdc9
commit 8da637854c
1 changed files with 1 additions and 1 deletions
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2
samples/cpp/connected_components.cpp
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@ -32,7 +32,7 @@ void on_trackbar(int, void*)
Mat dst = Mat::zeros(img.size(), CV_8UC3);
if( contours.size() > 0 )
if( !contours.empty() && !hierarchy.empty() )
{
// iterate through all the top-level contours,
// draw each connected component with its own random color