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I suspect he moved the camera slightly in between taking pictures, this would create different patterns which then reduces the amplitude of the distortion when you average these different patterns

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Makes sense, thanks! I just tried doing it in photoshop and observed that to remove moiré grid with single picture i'd need much higher blur radius -- not ideal for a ground truth image. (Note that its a far reaching guess).

I'm gonna add it to my fictional image analysis toolkit for next time when i'll need it.

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