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Research on Watermarking Technology of Printing Image in CMYK Space Based on Dual-Tree Complex Wavelet

Abstract— In the process of watermark embedding and extraction, there is a great contradiction between the invisibility and robustness of the watermark. In order to solve this contradiction, this paper presents a semiblind watermarking algorithm for printing image anti-counterfeiting in CMYK space, based on Arnold scrambling, 2D-DCT and dual-tree complex wavelet transform (DT-CWT). First, Arnold Scrambling is applied to the watermark image. Then the scrambled watermark image is transformed by 2D-DCT to obtain the frequency domain image. Second, the obtained frequency domain image is used to replace the sub-band containing the least information in the wavelet coefficient tree obtained from DT-CWT of the carrier CMYK image, and then applying invers dual-tree complex wavelet transform to the decomposed wavelet coefficient tree to get the watermarked CMYK image. The extraction process uses module matching technology to perform optimal watermark extraction on the watermarked images. Experimental results show that the algorithm not only has good confidentiality, but also can resist various attacks such as cropping, rotation, filtering, noise addition, lossy compression, etc. It is very suitable for anti-counterfeiting authentication of printed products.

Index Terms— DT-CWT, arnold scrambling, 2D-DCT, module matching.

Shen Lijun, Wang Wenju, Cui Ruibo, Jiang Zhongmin, Li Jinming, Tang Lijing, Sun Liujie
Shanghai University of Science and Technology, CHINA

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Cite: Shen Lijun, Wang Wenju, Cui Ruibo, Jiang Zhongmin, Li Jinming, Tang Lijing, Sun Liujie, "Research on Watermarking Technology of Printing Image in CMYK Space Based on Dual-Tree Complex Wavelet," Proceedings of 2018 the 8th International Workshop on Computer Science and Engineering, pp. 628-633, Bangkok, 28-30 June, 2018.