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C++ opencv3 no ideas how to divide these thresholded image

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After some image transform, I obtain these image. ![thresholded image](/upfiles/14997065783244451.png) After trsforming the video image I get this stain, which I would like to separate along the red line hand-drawn. I tried with shi-thoman corner detection without getting anything worthwhile. I do not know what strategy to take .... I'm able to filter the little point on screen with findcontour, for exemple and about area contour. But I have not ideas about how to separe the 4 object along the red line (the desired result ... red line is draw by hands). regards gfx

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