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
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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Jack -
Peter P.