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It's just looking at my room, there's no motion going on.

hehe, no visible motion for a human, but at pixel level, --- whoa.

Maybe my lighting

sure.

If I ran SIFT against the same JPEG

don't use jpeg compression for computer-vision, you'll never get back the same thing twice

Edit: I took a jpeg picture of my room

yea, now try that from another machine, a different libjpeg version, etc.