[FFmpeg-user] absolute difference

[Paul B Mahol]

On Fri, Mar 18, 2022 at 12:25 AM Michael Koch <astroelectronic at t-online.de>
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
>
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