On Fri, Mar 18, 2022 at 12:25 AM Michael Koch <[email protected]> wrote:
> Question 1: > I have two streams with RGB24 pixel formats. > Is it possible to do the following calculation pixel-wise and write the > result to a grayscale stream? > output = abs(R1-R2) + abs(G1-G2) + abs(B1-B2) > > Question 2: > Three streams are given: > [a] A static background image with no person in front of it. > [b] Exactly the same background with a person in front of it. The person > does move, but the background doesn't move. > [c] A new background, for example an image. > > I want to replace the background from stream [b] by background [c]. > If the absolute difference between [a] and [b] is larger than a > threshold, then pick [b], otherwise pick [c]. > > I did already play with maskedthreshold and threshold filters, but > didn't yet find a good solution for this problem. > http://oioiiooixiii.blogspot.com/2016/09/ffmpeg-extract-foreground-moving.html > > Michael > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
