Gray image watermark embedding and extracting method based on singular value decomposition
A singular value decomposition and gray-scale image technology, which is applied in image data processing, image data processing, instruments, etc., can solve the problems of few gray-scale image watermark processing methods, difficult to judge copyright information, and small digital watermark information capacity. , to achieve the effect of solving the illegal release of images, visualizing the amount of information, realizing copyright protection and image industry
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[0096] Example 1
[0097] The watermark in this embodiment is as figure 2 As shown, the size is 32*32 pixels, the singular value decomposition operation is performed on it to obtain singular value matrix values, and the singular values are encoded in descending order to obtain embedded watermark information w. The host image involved in this embodiment is as image 3 As shown, the size is 512*512 pixels, which is preprocessed according to step 2, and the specific embedding position of the watermark information is selected according to the activity factor value of each block. Then implement the digital watermark embedding according to step 3, such as Figure 4 Shown is the image with the watermark hidden. This method uses the peak signal-to-noise ratio (PSNR) to evaluate the imperceptibility of the algorithm. Without any attack, image 3 The PSNR value of the watermark embedded in the middle image is 42.6847. The watermark does not affect the image quality and is not noticeable ...
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