Images get distortion-proof crypto marks

Thursday, 24 October 2002, 11:20 AM EST

A team of scientists from Xerox and the University of Rochester said that the technique, called reversible data hiding, could be used in situations that require proof that an image has not been altered.

Its uses could range from sensitive military and medical diagnostic images to legal documents and photographs of crime scenes. The technique could also be used to encode information within the image itself for cataloging and retrieving from databases.

Concerns about the authenticity of Web-based tickets, receipts and signed contracts have hampered the development of some e-commerce applications. While digital watermarking offers protection against tampering in most situations, it can also irreversibly change the quality of an image.

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