Hi
Silly little problem , but for some reason the method rectangle does not react to the input argument.
This should yield a red box, but the box is always gray no matter what I do to the input arguments of Scalar.
rectangle( CurrentMat, matchLoc, Point( matchLoc.x + TemplateMat.cols , matchLoc.y + TemplateMat.rows ), Scalar(0,0,255), 2, 8, 0);
Any suggestions? TIA.
Hi, check the type of your image (CurrentMat). If it is a single channel image, the rectangle will be drawn in gray. Then you can use cv::cvtColor() to convert the image into a RGB image and draw the rectangle in this image.
cv::Mat CurrentMat_RGB;
cv::cvtColor(CurrentMat, CurrentMat_RGB, CV_GRAY2RGB);
rectangle( CurrentMat_RGB, matchLoc, Point( matchLoc.x + TemplateMat.cols , matchLoc.y + TemplateMat.rows ), Scalar(0,0,255), 2, 8, 0);Asked: Dec 10 '12
Seen: 5,883 times
Last updated: Dec 10 '12
Are your CurrentMat grayscale? If CurrentMat is 1-channel mat, rectangle always draw grayscale objects.