Towards copy-evident JPEG images

12 years 6 months ago
Towards copy-evident JPEG images
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 technique aims to achieve a goal similar to copy-evident security-printing techniques for paper documents, namely to have an easily recognizable text message appear in lower-quality copies, while leaving the visual appearance of the original unharmed. We exploit non-linearities in the JPEG process, in particular the clipping of the result of the inverse discrete cosine transform.
Andrew Lewis, Markus Kuhn
Added 24 Jul 2010
Updated 24 Jul 2010
Type Conference
Year 2009
Where GI
Authors Andrew Lewis, Markus Kuhn
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