| Document Date: 2009-10-12 05:02:25
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Company Independent JPEG Group / Computer Laboratory / / Currency EUR / / Facility Independent JPEG Group library / University of Cambridge / / IndustryTerm copy-evident multi-media file / trap printing techniques / copy-evident security-printing techniques / power law / compression algorithms / security-printing techniques / possible processing parameters / Internet service / particular a priori known processing step / display device / lossy processing techniques / printing process / hidden processing step / / Organization International Organization for Standardization / University of Cambridge / / Person Markus G. Kuhn / Andrew B. Lewis / Rudolf L. van Renesse / Thomas G. Lane / / Position editor / / PublishedMedium Proceedings of SPIE / / Technology 1 Marking algorithm / LAN / HTTP / ISP / JPEG / Information technology / compression algorithms / / URL http /
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Towards copy-evident JPEG images Andrew B. Lewis, Markus G. Kuhn Abstract: We present a technique for adding a high-frequency pattern to JPEG images that is imperceptible to the unaided eye, but turns into a clearly readable largeletter warning if the image is recompressed with some different quality factor. Our