A robust watermarking algorithm based on QR factorization and DCT using quantization index modulation technique 被引量：1

A robust watermarking algorithm based on QR factorization and DCT using quantization index modulation technique

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摘要 We propose a robust digital watermarking algorithm for copyright protection.A stable feature is obtained by utilizing QR factorization and discrete cosine transform(DCT) techniques,and a meaningful watermark image is embedded into an image by modifying the stable feature with a quantization index modulation(QIM) method.The combination of QR factorization,DCT,and QIM techniques guarantees the robustness of the algorithm.Furthermore,an embedding location selection method is exploited to select blocks with small modifications as the embedding locations.This can minimize the embedding distortion and greatly improve the imperceptibility of our scheme.Several standard images were tested and the experimental results were compared with those of other published schemes.The results demonstrate that our proposed scheme can achieve not only better imperceptibility,but also stronger robustness against common signal processing operations and lossy compressions,such as filtering,noise addition,scaling,sharpening,rotation,cropping,and JPEG/JPEG2000 compression. We propose a robust digital watermarking algorithm for copyright protection. A stable feature is obtained by utilizing QR factorization and discrete cosine transform （DCT） techniques, and a meaningful watermark image is embedded into an image by modifying the stable feature with a quantization index modulation （QIM） method. The combination of QR factorization, DCT, and QIM techniques guarantees the robustness of the algorithm. Furthermore, an embedding location selection method is exploited to select blocks with small modifications as the embedding locations. This can minimize the embedding distortion and greatly improve the imperceptibility of our scheme. Several standard images were tested and the experimental results were compared with those of other published schemes. The results demonstrate that our proposed scheme can achieve not only better imperceptibility, but also stronger robustness against common signal processing operations and lossy compressions, such as filtering, noise addition, scaling, sharpening, rotation, cropping, and JPEG/JPEG2000 compression.

作者 Hong-yuan CHEN Yue-sheng ZHU

机构地区 Communication and Information Security Lab

出处《Journal of Zhejiang University-Science C(Computers and Electronics)》 SCIE EI 2012年第8期573-584,共12页 浙江大学学报C辑（计算机与电子（英文版）

基金 Project supported by the "Shuang Bai Plan" and "Shenzhen-Hong Kong Innovation Circle" Research Program of Shenzhen,China

关键词 Digital watermarking QR factorization Quantization index modulation （QIM） Discrete cosine transform （DCT）

分类号 TP309.2 [自动化与计算机技术—计算机系统结构]

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参考文献23

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