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A new watermarking approach based on lapped orthogonal transform (LOT) is proposed. It provides better imperceptibility by reducing the blocking effects which exist in most block-based image coding transforms like JPEG. The proposed scheme performs the LOT to the cover image, modifies the LOT coefficients to hide the watermark bits according to the given user-key, and executes the inverse LOT to generate a watermarked image. It requires no original cover image to be introduced during extraction, and it has strong robustness under the JPEG attacks.
Circuits and Systems, 2004. Proceedings. The 2004 IEEE Asia-Pacific Conference on (Volume:2 )
Date of Conference: 6-9 Dec. 2004