Question

I have been testing background subtraction using gaussian state model. I am using opencv
2.1.0. I can generate binary image of foreground of the scene. Now all I want to do is Draw
countour bounding rectangle to highlight the moving object. I have used cvCountourBoundingRect
to obtain the rectangle covering countour. The issue I am facing is in case of multiple
countour, sometime nearby rectangle overlaps. Here, can anyone suggest me to prevent
overlapping of rectangle? In ideal case, two rectangle should not be overlapped. It rather
should be draw a bigger rectagle which covers all two rectangles.

Any suggetion will be greatful.

Answer 1

There’s no ready possibility to do this in OpenCV. But actually the algorithm is very easy:

1. Cycle through all rectangles and check if two rectangles overlap each other. This topic will be useful: Determine if two rectangles overlap each other?
2. For every overlapped pair of rectangles create rectangle that contains both of them. To do this you should select one corner from first rectangle and another corner from second rectangle and these two corners will create rectangle for you. I don’t think that it’s a hard task – just simple math.