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- W2133079966 abstract "In the paper is presented one approach for image content protection based on layered still image decomposition with Inverse Difference Pyramid (IDP) and digital watermark insertion. Unlike the famous pyramid decompositions (Laplacian, Gaussian, etc.), the IDP starts from the pyramid top, which comprises smallest number of coefficients, and continues with the next decomposition layers (i.e., it represents the processed image with consecutive approximations of increasing quality). The new approach permits the insertion of multiple watermarks in the consecutive decomposition layers (resistant and fragile) and their reliable extraction by authorized users only. The fragile watermark is added as additional information in the corresponding decomposition layers. Any change in the extracted fragile watermark indicates unauthorized image editing. The resistant watermark embedding is performed in the image spectrum phase domain. For this, the decomposition is accomplished with Complex Hadamard Transform (CHT). The resistant watermark is inserted in the transform coefficients' imaginary part, which permits the insertion of relatively large amounts of watermark data in the protected image. The images are transformed into new format, based on the IDP decomposition. This approach affords the opportunity for the successful developing of various applications - image content protection; historical heritage protection; telemedicine and healthcare; transfer of confidential information with restricted access and many others." @default.
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- W2133079966 date "2010-07-01" @default.
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- W2133079966 title "Fragile and resistant image watermarking based on inverse difference pyramid decomposition" @default.
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