Image watermarking method based on DCT direct-current coefficients of Weibull model

The invention discloses an image watermarking method based on the DCT direct-current coefficients of the Weibull model. In the watermark embodiment stage, discrete cosine transform (DCT) is conducted on non-overlapping 8*8 image blocks in an image block by block, watermark signals are embedded in th...

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Bibliographic Details
Main Authors HU PENG, LYU YONG, PAN YANGXU, LI JIANNI, DONG LUAN, YAN QIN
Format Patent
LanguageChinese
English
Published 03.09.2014
Subjects
CALCULATING
COMPUTING
COUNTING
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
PHYSICS
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Summary:The invention discloses an image watermarking method based on the DCT direct-current coefficients of the Weibull model. In the watermark embodiment stage, discrete cosine transform (DCT) is conducted on non-overlapping 8*8 image blocks in an image block by block, watermark signals are embedded in the direct-current coefficients of all the DCT blocks according to a multiplication rule, and discrete cosine transform is conducted on all the DCT blocks where watermarks are embedded so that a watermarked image can be obtained. In the watermark extraction stage, discrete cosine transform is conducted on the non-overlapping 8*8 image blocks in the watermarked image block by block, the direct-current coefficients of all the DCT blocks are selected, modeling is conducted according to the Weibull model, model parameters are estimated, and watermark detection is conducted through a specific detector. The image watermarking method overcomes the defect that modeling can not be conducted on the discrete cosine transform th
Bibliography:Application Number: CN20141252643