I've extracted a few images out of a video and want to filter and find the legth of the visible blobs. I've tried edge filtering and a hough transformation to find the houghlines in the plot but it doesn't seem to be sensitive enough. The single blobs are just a few pixels in legth and always connect to each other. only the streaks in the middle of the frame are relevant. the tiny circular dots are noise. Any help would be appreciated.