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A new extension to wavelet transform called Contourlet was introduced. It possessed not only spatial and frequency locality and multiresolution but also directionality and anisotropy. We made use of the trait of contourlet coefficient, and analyzed the embedding location and depth. The watermarks were inserted in locations, which were identified by contourlet coefficients corresponding to the strong image texture. And the embedding depth was adjusted intelligently based on the noise visibility function (NVF). The proposed algorithm is robust enough in withstanding some attacks such as filtering, adding noise, and JPEG compression.
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Source :
DCABES 2006 PROCEEDINGS, VOLS 1 AND 2
Year: 2006
Page: 329-332
Language: English
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