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January 11, 2005
Image Professionals Respond to Mars Rover(Part1)
Mark Carlotto responds:
JPEG compresses 8 x 8 pixel blocks of the image. You can see this if you zoom up on and enhance low contrast portions of the image. The object looks like it is a little bigger than 8 pixels, and so it occurs in two adjacent compression blocks. Although it is possible for noise to corrupt one block it is unlikely that it would affect two adjacent blocks. So I'd say that it's probably not a compression artifact.
Posted by Peter at January 11, 2005 12:47 PM
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