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Digital watermarking techniques: A case study in fingerprints and faces (0)
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| Citations: | 10 - 0 self |
BibTeX
@MISC{Jain_digitalwatermarking,
author = {Sonia Jain},
title = {Digital watermarking techniques: A case study in fingerprints and faces},
year = {}
}
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Abstract
Watermarks have been used for centuries to authenticate images and prevent forgery. Today watermarks are embedded into digital images so that legitimate owners can assert ownership and ensure the validity of their data. However, these images (like fingerprints) are being transmitted over channels with increased frequency, thus the potential for attacks during transmission is a major concern. Recipients need a mechanism which can verify the integrity of their image. If the images are watermarked, it is straightforward for the owner to authenticate the images. But, determining whether the correct image has in fact been sent and that it has been transmitted without alteration requires use of data the owner would prefer not to transmit (namely the watermark itself or the original image). Therefore, a different key needs to be used by the receiver for authentication. We propose a local average scheme where an executable compares the block by block local average of the transmitted image and the received image. This is robust enough to detect even the most minor changes and determine where such changes took place in the image.
