Converting the absolute difference to greyscale and running it through a threshold filter allows us to more clearly see the difference between frames.
Using a blend mode and reducing the transparency of frames as they play creates a very interesting effect reminiscent of memory. By recording the movement in the video, essentially what is being captured is the moving object, at various stages, creating a visual 'trail' of it's previous states.
Again, I need to find out how I can insert external images into this process.
tutorial from createdigitalmotion.com
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