Fragile watermarks for detecting tampering in images

Details Fragile watermarks for detecting tampering in images Fragile watermarks for detecting tampering in images

1998-03-30

2000-05-16

Tadayon, Bisan

Image analysis

Pattern recognition

Limited to specially coded, human-readable characters

382100, G06K 900

Patent

active

060647647

ABSTRACT:
A watermarking scheme for images which includes techniques for inserting and extracting fragile watermarks in the frequency domain and for determining whether an image so watermarked has been tampered with. Watermark insertion is accomplished by embedding the bits of a digital signature of a hash function of the image in the frequency coefficients of the image. Tamper detection is accomplished generally as follows: the fragile watermark which was embedded during the watermark insertion process is extracted from the image; the hash function of the image is computed as in the insertion process; it is verified using a public key whether the extracted watermark is a valid signature of the hash value. If so, then there is assurance that the image has not been tampered with. Otherwise, there is reason to conclude that the image has been tampered with.

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