i used canny function to detect the contour in my android app but i would now to fill the inside of the forms to treat the image easely.

edit savecancel

I don't like just to find contours but i would to fill the inside of contours with white color .i find the Floodfill function is it useful for me in this case?

when you put thickness -1 it will fill every contour for you. i have never use floodfill, so you should give it a try

I tried thickness -1 I test it with some formes that i draw and it works really but it doen't work efficiently in my picture case because the contours aren't very clear .Have you an other solution which help me?

I think the problem here is, that cv:Canny will leave a lot of open edges, because of "non maxima suppression". So you can't fill these contours in a satisfactory way. A method to avoid this problem is to blur your image in the first step with cv::GaussianBlur or cv::blur. Than use cv::Sobel or cv::Laplacian and finally use a cv::threshold