Method and device for processing and watermarking a set of coefficients representing a digital image
First Claim
1. Method of processing a set of coefficients (Xi,j) representing a digital image (300) with a view to an insertion of at least one item of watermarking information (Wr) in said image, this image being liable to undergo a set of geometric transformations and said coefficients being grouped together in regions (Bi), said method being characterised in that it includes the following steps:
- determining (E220), amongst at least some of said regions (Bi), a set of so-called acceptable regions, adapted to receive said at least one item of watermarking information (Wr); and
sequencing (E230), according to at least one predetermined criterion, at least one part of said set of acceptable regions (Bi), in an order which is invariant with respect to at least one of said geometric transformations.
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Abstract
The invention concerns a method of processing a set of coefficients representing a digital image (300) with a view to an insertion of at least one item of watermarking information in said image, this image being liable to undergo a set of geometric transformations and said coefficients being grouped together in regions, said method being characterized in that it includes a step (E220) of determining, amongst at least some of said regions, a set of so-called acceptable regions, adapted to receive said at least one item of watermarking information; and a step (E230) of sequencing, according to at least one predetermined criterion, at least one part of said set of acceptable regions, in an order which is invariant with respect to at least one of said geometric transformations.
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Citations
37 Claims
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1. Method of processing a set of coefficients (Xi,j) representing a digital image (300) with a view to an insertion of at least one item of watermarking information (Wr) in said image, this image being liable to undergo a set of geometric transformations and said coefficients being grouped together in regions (Bi), said method being characterised in that it includes the following steps:
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determining (E220), amongst at least some of said regions (Bi), a set of so-called acceptable regions, adapted to receive said at least one item of watermarking information (Wr); and
sequencing (E230), according to at least one predetermined criterion, at least one part of said set of acceptable regions (Bi), in an order which is invariant with respect to at least one of said geometric transformations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 29, 30, 32, 33, 35, 36)
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16. Method of decoding a watermarking code (C′
- ) obtained from at least one item of watermarking information (W′
i) inserted in a set of coefficients (X′
i,j) representing a digital image (320), this image (320) being liable to have undergone a set of geometric transformations and said coefficients being grouped together in regions (B′
i), said method being characterised in that it includes the following steps;
determining (E720), amongst at least some of said regions (B′
i), a set of so-called acceptable regions, adapted to receive said at least one item of watermarking information (W′
i);
determining a set of so-called watermarked regions (B′
i) amongst said set of acceptable regions, said watermarked regions (B′
i) having received said at least one item of watermarking information (W′
i);
decoding (E730) said at least one item of watermarking information (W′
i) for each of said watermarked regions (B′
i);
sequencing (E740) said watermarked regions (B′
i) according to at least one predetermined criterion, in an order which is invariant with respect to at least one of said geometric transformations; and
reconstituting said watermarking code (C′
) by sequencing said watermarking information (W′
i) as a function of said sequencing of said watermarked regions. - View Dependent Claims (19, 20, 21, 22, 24, 26, 28, 31, 34, 37)
- ) obtained from at least one item of watermarking information (W′
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23. Device for processing a set of coefficients (Xi,j) representing a digital image (300) with a view to an insertion of at least one item of watermarking information (Wr) in said image, this image (300) being liable to undergo a set of geometric transformations and said coefficients (Xi,j) being grouped together in regions (Bi), said device being characterised in that it has:
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means of determining, amongst at least some of said regions, a set of so-called acceptable regions (Bi), adapted to receive said at least one item of watermarking information (Wr); and
means of sequencing, according to at least one predetermined criterion, at least one part of said set of acceptable regions (Bi), in an order which is invariant with respect to at least one of said geometric transformations.
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25. Device for watermarking a set of coefficients (Xi,j) representing a digital image (300) which is liable to undergo a set of geometric transformations and said coefficients (Xi,j) being grouped together in regions (Bi), said device being characterised in that it has:
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means of determining, from amongst at least some of said regions, a set of so-called acceptable regions (Bi), adapted to receive said at least one item of watermarking information (Wr);
means of sequencing, according to at least one predetermined criterion, at least one part of said set of acceptable regions (Bi), in an order which is invariant with respect to at least one of said geometric transformations; and
means of inserting at least one item of watermarking information (Wr), for at least certain regions (Br) in said at least one part of said set of acceptable regions, said at least one item of watermarking information (Wr) being invariant with respect to at least one of said geometric transformations.
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27. Device for decoding a watermarking code (C′
- ) consisting of at least one item of watermarking information (W′
i) inserted in a set of coefficients (X′
i,j) representing a digital image (320), this image being liable to have undergone a set of geometric transformations and said coefficients (X′
i,j) being grouped together in regions (B′
i), said device being characterised in that it has;
means of determining, amongst at least some of said regions, a set of so-called acceptable regions (B′
i), adapted to receive said at least one item of watermarking information (W′
i);
means of determining a set of so-called watermarked regions (B′
i) amongst said set of acceptable regions, said watermarked regions having received said at least one item of watermarking information (W′
i);
means of decoding said at least one item of watermarking information (W′
i) for each of said watermarked regions;
means of sequencing said watermarked regions (B′
i) according to at least one predetermined criterion, in an order which is invariant with respect to at least one of said geometric transformations; and
means of reconstituting said watermarking code (C′
) by sequencing the said watermarking information (W′
i) as a function of said sequencing of said watermarked regions (B′
i).
- ) consisting of at least one item of watermarking information (W′
Specification