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I want to detect an object floating over water. I applied canny edge detector and found all the contours in it. Now I want to match these contours to the contours of another image of the same sight taken with a still camera and very little time gap, to first find the same objects and then calculate how much difference have they covered.. Kindly help me out with this. i searched a lot but couldn't find any thing clear.

HassanShafiq
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If I got it right, you are trying to use the contours of an object to track its position on different images. In this case, you might be interested in template matching techniques.

In short, you'll be using matchTemplate to find the most probable location of a template (the contour of the object) on another image.

brunocodutra
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  • How can I use template matching in a specific area of the other image?? suppose I only want to match the contour in half of the other image..How can I achieve that? – HassanShafiq Sep 14 '13 at 23:04
  • @HassanShafiq use a ROI. http://stackoverflow.com/questions/7041181/equivalent-to-cvsetimageroi-in-the-opencv-c-interface – brunocodutra Sep 14 '13 at 23:44