Method and apparatus for fragile watermarking
First Claim
Patent Images
1. A method of fragile watermarking comprising:
- generating at least a first ill-conditioned operator related to values extracted from an image or portion thereof A; and
replacing a non-zero singular value of a singular value matrix SA of an image or portion thereof A, with a solution to a linear equation comprising the ill-conditioned operator, wherein the non-zero singular value to be replaced is the smallest non-zero singular value Sr(A) in a singular value matrix SA of rank r.
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Abstract
A method of fragile watermarking is characterized by the step of generating at least a first ill-conditioned operator, said ill-conditioned operator being related to values extracted from an image or portion thereof A.
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Citations
17 Claims
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1. A method of fragile watermarking comprising:
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generating at least a first ill-conditioned operator related to values extracted from an image or portion thereof A; and replacing a non-zero singular value of a singular value matrix SA of an image or portion thereof A, with a solution to a linear equation comprising the ill-conditioned operator, wherein the non-zero singular value to be replaced is the smallest non-zero singular value Sr(A) in a singular value matrix SA of rank r. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of verifying a fragile watermark comprising:
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generating at least a first ill-conditioned operator by altering a value to increase its condition number, said ill-conditioned operator being related to values extracted from a received image or portion thereof A*; and calculating a solution to the least squares problem - View Dependent Claims (16, 17)
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Specification