International Journal of Image, Graphics and Signal Processing (IJIGSP)
IJIGSP Vol. 9, No. 9, 8 Sep. 2017
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An Improved DCT based Image Watermarking Robust Against JPEG Compression and Other Attacks
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Author(s)
Index Terms
Image security, ownership, authentication, invisible watermarking, DCT, JPEG compression, re-watermarking
Abstract
Rapid growth of internet service attains better security of multimedia contents now a days. Heading this problem a DCT-based color image watermarking framework is proposed in this article. Many earlier works have suggested embedding watermark information in the low frequencies of the image to enhance the robustness against JPEG compression because low frequencies hold the most significant information of the image and not affected significantly by the quantization method of JPEG algorithm. Replacement of low-frequency components with watermark directly may incur undesirable degradation to the image quality. To preserve the visual quality of watermarked images, we are proposing a watermarking framework that adjusts the DCT low-frequency coefficients by scaled averaging. The security issue is well-taken care with double secret keys. Experimental result set demonstrates that the embedded watermark can be extracted efficiently from the JPEG-compressed images even after very high compression, re-watermarking, other image processing attacks. The extraction algorithm is blind i.e., neither host image nor the watermark is needed at the time of extraction.
Cite This Paper
Soumik Das, Monalisa Banerjee, Atal Chaudhuri,"An Improved DCT based Image Watermarking Robust Against JPEG Compression and Other Attacks", International Journal of Image, Graphics and Signal Processing(IJIGSP), Vol.9, No.9, pp.40-50, 2017. DOI: 10.5815/ijigsp.2017.09.05
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