How to make Rect transparent in opencv -


i looked @ opencv java doc loading in images onto frame. did using frame picture transparent, image has black background inside rectangular container. rect function : 

mat submat = src.submat(new(rect((int) facesarray[i].tl().x, (int) facesarray[i].tl().y, (int)(facesarray[i].br().x- facesarray[i].tl().x), (int)(facesarray[i].br().y- facesarray[i].tl().y));

is there way set background of image transparent (i want remove black background , make transparent). please see link more info.

enter image description here


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