High-robustness digital watermarking method making color QR code embedded in color image

Abstract

The invention relates to a high-robustness digital watermarking method making a color QR code embedded in a color image. Based on a color QR code, a Contourlet transformation technology, a DCT (discrete cosine transformation) technology and an SVD (singular value decomposition) transformation technology, the color QR code is adopted as original watermark information. The method includes the following steps that: a color host image and the color QR code are water-marked in an RGB space so as to be subjected to three-channel decomposition, and three-channel watermarks obtained after the decomposition are subjected to chaotic encryption separately; Contourlet transformation is performed on each channel image of the color host image, and DCT is performed on the low-frequency components of the channel images, and the direct-current components of the channel images are adopted to construct new matrixes, SVD transformation is performed on the new matrixes, so that singular value matrixes can be obtained; and the watermarks are embedded into corresponding channels, SVD inverse transformation, inverse DCT, and Contourlet inverse transformation are carried out, so that the color image containing the watermarks can be obtained. Compared with an existing algorithm for embedding color watermarks into a color image, the high-robustness digital watermarking method of the invention has the advantages of high imperceptibility and high robustness.

Description

technical field [0001] The invention relates to a digital watermarking technology for copyright protection of color digital images, in particular to a robust digital watermarking method for embedding color QR codes into color images. Background technique [0002] In recent years, with the rapid development of Internet technology, the protection of digital product copyright has become more and more important. Copyright protection of color images is an important point. Digital watermark technology provides a new way for copyright protection of color images. Since the color image is copied or destroyed through multiple transmissions in the network, the image will be damaged, which increases the difficulty of watermark extraction, which has higher requirements for watermark extraction. [0003] At present, there are many digital watermarking algorithms for color images, but the embedded original watermark information is basically a binary watermark image or a grayscale image; ...

AI Technical Summary

Problems solved by technology

Since the color image is copied or destroyed through multiple transmissions in the network, the image will be damaged, which increases the difficulty of watermark extraction, which has higher requirements for watermark extraction.

[0003] At present, there are many digital watermarking algorithms for color images, but the embedded original watermark information is basically a binary watermark image or a grayscale image; some algorithms have certain security, but the extracted watermark will be noisy or partially missing. Basically only subjective evaluation or structural similarity evaluation

Most color image watermarking algorithms cannot solve the embedding of color watermarks. In some digital watermarking algorithms embedded with color watermarks, after extracting meaningful color watermarks, due to image damage, only subjective evaluation can be performed to measure whether the watermark exists or not. The meaning represented by the watermark lacks the necessary persuasiveness

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