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Hey that's cool. How'd they do it? I guess some sort of logic to look for movement in the image and put the stars around it?

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Flash (and other) video compression uses a similar algorithm to look for parts of a video that are more static. (To avoid re-sending information about a static background, for example.) I'd guess it's a modification from compression technology.

to avoid re-sending information about a static background for example. I wonder if they built theirs from scratch or just modified

They're just overlaying sprites (stars in this case) in areas of high deltas (changes). That's all.

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