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I can confirm with this screenshot (http://cl.ly/image/2Q2e3k1w0g25 http://cl.ly/image/2Q2e3k1w0g25) that imgur does indeed do some sort of compression that mak

I can confirm with this screenshot (http://cl.ly/image/2Q2e3k1w0g25 http://cl.ly/image/2Q2e3k1w0g25) that imgur does indeed do some sort of compression that makes this solution break with an imgur link for Mathematica 9. I may investigate a bit further. I had previously tested with an uncompressed image, and the same technique did produce the expected results from the answer on Stackexchange. UPDATE: Changed the correlation value from .12 to .2 and the compressed imgur image has some interesting results (3 circles, one of them is on Waldo): http://cl.ly/image/0Z3k150S2z10 http://cl.ly/image/0Z3k150S2z10

sillysaurus3 12y ago
Changed the correlation value from .12 to .2 and the compressed imgur image has some interesting results (3 circles, one of them is on Waldo): http://cl.ly/image/0Z3k150S2z10 http://cl.ly/image/0Z3k150S2z10 Yeah, I'm getting the exact same results. So it looks like compression is messing with the algorithm's correlation ability. I think the problem is that red color values are often thrown out in image compression (moreso than intensity / green channels).