All zero-valued pixels in the same connected component as the seed point of the mask are replaced by the value you specify. This value must be added to the flags parameter, left-shifted by 8 bits: uchar fillValue = 128; cv::floodFill(img, mask, seed, cv::Scalar(255) ,0, cv::Scalar(), cv::Scalar(), 4 | cv::FLOODFILL_MASK_ONLY | (fillValue << 8)); A simple, … Read more
As a heuristic, you could construct a graph where each node represents a set of contiguous, same-colour squares, and each node is connected to those it touches. (Each edge weighted as 1). You could then use a path-finding algorithm to calculate the “distance” from the top left to all other nodes. Then, by looking the … Read more
According to the documentation of imfill in MATLAB: BW2 = imfill(BW,’holes’); fills holes in the binary image BW. A hole is a set of background pixels that cannot be reached by filling in the background from the edge of the image. Therefore to get the “holes” pixels, make a call to cvFloodFill with the left … Read more