Hello Peter,
It is possible to use shaders for this purpose if you don't have to use only pix_ objects. For exemple, get the result of a dot product between the normalized background color and the normalized texels colors. Then use a threshold to determine if a pixel need to be transparent or not (you can even smooth this result if needed for a better result). ++
Jack
Le 06/02/2018 à 17:53, Peter P. a écrit :
Hi list,
just wondering if anyone has looked into a way to subtract a background in Gem pixes using a hybrid approach between frame difference [pix_movement] and difference to a static snapshot [pix_background]. I want to be able to detect object in front of a background also during slow light condition changes or unsupervised operation in say a gallery context. I can remember that EyesWeb had an adaptive background subtraction, that did possibly time-average a series of images to derive the background snapshot. Has anyone done anything more fancy in Gem than the two wonderful objects above offer?
thanks for all ideas! Peter
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