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Research on Chaotic Scrambling Colourful Digital Watermarking Technology Based on DT-CWT

Abstract— In order to improve the invisibility of watermark information, this paper proposes a technique of embedding watermark according to the direction of digital colorful image texture. First, the scrambling watermarking Image is obtained by chaotic scrambling and Fast Fourier Transformation (FFT). Second, the embedding channel of the colorful carrier image is chosen which depends on human visual characteristics and PSNR, and Gray Level Co-occurrence Matrix is applied to judge the direction which is suitable for the Dual-Tree Complex Wavelet Transformation (DTCWT) decomposition directions (15 ,45 ,75 ) .Third, the chosen channel is DTCWT decomposed into the third level, the sub-image which is suitable for the direction is substituted by the scrambling watermarking Image. In the end, the decomposed carrier image is inverse Dual-Tree Complex Wavelet transformed to obtain the watermarked image. In the extraction procession, the conjugate image generated by FFT is corrected by inverse chaotic scrambling. Results: Experimental results show that the algorithm can well embed the watermark into the colorful image, and the invisibility of the watermarking image is better in the image area with the texture direction.

Index Terms— blind watermarking, DTCWT, digital watermarking, FFT, Chaotic scrambling.

CUI Ruibo, WANG Wenju, SHEN Lijun,LI Jinming, TANG Lijing
Shanghai University of Science and Technology, CHINA
Liu Jiayin
The Information Center of Shandong Province Tobacco Company, CHINA

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Cite: CUI Ruibo, WANG Wenju, SHEN Lijun,LI Jinming, TANG Lijing, Liu Jiayin, "Research on Chaotic Scrambling Colourful Digital Watermarking Technology Based on DT-CWT," Proceedings of 2018 the 8th International Workshop on Computer Science and Engineering, pp. 623-627, Bangkok, 28-30 June, 2018.