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Message: <blockquote data-quote="jawbroken" data-source="post: 70407" data-attributes="member: 14372">Yes, it does put you in danger of discovering logos, but as these are small in terms of screen real estate they should be easy to discard. As I stated in my second point, this could probably be easily done in the same algorithm that determines if an edge is horizontal or vertical.Perhaps your "binary search" method might work better, but I just get the impression that edge detection will need to examine less pixels than scans. I might try to knock something together over the weekend and perhaps collect some data on number of pixels examined and frame processing time.I also have another idea to do with the stream algorithm, which may be fast even for frame data because of caching and linear access.</blockquote>