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A watermarking scheme that varies the coefficient is described. A watermark element is embedded in the scheme, according to blocks. This scheme generates watermarked images with a desired objective image quality in terms of the peak signal-to-noise ratio, and it extracts an embedded watermark without any reference images. The proposed scheme can change the.subjective image quality of a watermarked image independent of the objective image quality by selecting the coefficient for embedding according to the blocks. However, malicious detection of the embedding coefficients becomes difficult.

An Image Quality Guaranteed Watermarking Scheme by Spreading the Spectrum of Watermarks