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I've seen that kind of thing in Quick Cam's and Sac camera's (which use QC chips last I heard), usually when the gain is pushed too high.
It's not normally so smooth as you have there, but the same pattern of lines.
I've never checked if it's in one colour channel or not, i don't remember it having a specific hue.
I have always thought it's related to electrical interference or magnets or something like that around. Perhaps even something in the computer or camera its self.
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