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FIX: VideoCapture::read() was returning empty image for camera captures

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This commit is contained in:
Alexander Mordvintsev 2012-05-22 07:58:31 +00:00
parent 37d9c3f835
commit 8429c109be
1 changed files with 10 additions and 9 deletions
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19
modules/highgui/src/cap.cpp
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@ -494,11 +494,15 @@ bool VideoCapture::retrieve(Mat& image, int channel)
bool VideoCapture::read(Mat& image) bool VideoCapture::read(Mat& image)
{ {
if (get(CV_CAP_PROP_POS_FRAMES) < get(CV_CAP_PROP_FRAME_COUNT)) double frame_pos = get(CV_CAP_PROP_POS_FRAMES);
if(!grab()) double frame_count = get(CV_CAP_PROP_FRAME_COUNT);
image.release(); if (frame_pos < frame_count || frame_pos < 0 || frame_count < 0)
else {
retrieve(image); if(grab())
retrieve(image);
else
image.release();
}
else else
image.release(); image.release();
return !image.empty(); return !image.empty();
@ -506,10 +510,7 @@ bool VideoCapture::read(Mat& image)
VideoCapture& VideoCapture::operator >> (Mat& image) VideoCapture& VideoCapture::operator >> (Mat& image)
{ {
if(!grab()) read(image);
image.release();
else
retrieve(image);
return *this; return *this;
} }