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` PCA measures JPEG artifacts.` Just for some clarification - how does that work, exactly? If you decompose an image using PCA/SVD and find a cliff in the spec
by thearn4 13y ago
` PCA measures JPEG artifacts.`
Just for some clarification - how does that work, exactly? If you decompose an image using PCA/SVD and find a cliff in the spectrum, is that a fingerprint of JPEG compression?
- Havoc 13y agoThe name doesn't ring a bell, but judging by the pic its this stuff: http://29a.ch/2012/4/15/image-error-level-analysis-with-html5 http://29a.ch/2012/4/15/image-error-level-analysis-with-html...
- sp332 13y agoAll the chunks of a JPEG image should be saved with the same quantizer. If part of an image is pasted in from a different JPEG, there will be a difference in the level of compression.