Transforming domain geometric-attack-resistant gray level image digital watermark technology
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An anti-geometric attack and grayscale image technology, applied in the field of image processing, can solve problems that cannot be put into practical applications, and achieve strong practical effects
Inactive Publication Date: 2013-09-04
UNIV OF SHANGHAI FOR SCI & TECH
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[0004] The transform domain watermarking technology proposed in the article "A Wavelet Domain Blind Image Watermarking Algorithm Against Geometric Attacks" is simple and can resist rotation and scaling attacks. difference method, and the watermark image extracted by this watermarking technology can only be observed subjectively by the human eye, and there is no objective standard to judge whether there is a watermark, which also makes this method unable to be put into practical application
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Embodiment 1
[0069] image 3 is the original carrier image.
[0070] Such as image 3 As shown, the original carrier image is a standard grayscale image with 1024×1024 pixels.
[0071] Figure 4 for embedding watermarks.
[0072] Such as Figure 4 As shown, a QR two-dimensional code has been embedded into a standard 1024×1024 pixel grayscale image according to steps S1-1 to S1-4.
[0073] Figure 5 is the QR code to be embedded.
[0074] Such as Figure 5 Shown is the QR code to be embedded.
[0075] Figure 6 is the extracted QR code.
[0076] Such as Figure 6 As shown, the embedded QR two-dimensional code is extracted from the standard 1024×1024 pixel grayscale image according to steps S2-1 to S2-2.
Embodiment 2
[0078] Figure 7 Rotate an arbitrary angle for a watermarked image.
[0079] Such as Figure 7 As shown in the figure, the standard 1024×1024 pixel grayscale image carrying the QR two-dimensional code watermark is rotated at any angle.
[0080] Figure 8 The watermark image extracted for the watermarked image rotated at any angle.
[0081] Such as Figure 8 As shown, the QR two-dimensional code watermark is extracted from the watermarked image rotated at any angle according to the steps S2-1 to S2-2, and it can still be decoded.
Embodiment 3
[0083] Figure 9 Watermarked image for arbitrary proportional scaling.
[0084] Such as Figure 9 As shown, the standard 1024×1024 pixel grayscale image carrying the QR two-dimensional code watermark is scaled by any scale.
[0085] Figure 10 is a watermark image extracted from any proportionally scaled watermarked image.
[0086] Such as Figure 10 As shown, the QR two-dimensional code watermark can still be decoded by extracting the QR two-dimensional code watermark from any proportionally scaled watermarked image according to the steps S2-1 to S2-2.
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Abstract
The invention relates to a transforming domain geometric-attack-resistant gray level image digital watermark technology which can resist to general image processing attacks, meanwhile, can effectively resist to image rotation and equal proportion zooming attacks, and can solve the problem that overlarge embedding strength has influences on human eye vision effects. According to the technical scheme, a two-dimension code technology and contourlet converting characteristics are combined to embed two-dimension codes into a gray level image, meanwhile, safety of the two-dimension codes is guaranteed through an encryption method combining substitution and replacement of character strings, a quantization mode is adopted to blindly extract watermark information, and the problem that the image cannot resist to random rotation and equal proportion zooming is solved by the two-dimension codes. The transforming domain geometric-attack-resistant gray level image digital watermark technology can effectively solve the problem that the image can not resist to random rotation and equal proportion zooming attacks, can also resist to the general image processing attacks in a certain degree, and can be widely applied to copyright protection on bigger digital images (not less than 1024*1024 pixels).
Description
technical field [0001] The invention relates to a digital watermarking method, which belongs to the field of image processing Background technique [0002] With the rapid development of network and communication technology, the issue of copyright protection of digital products has become increasingly prominent. Whether it can effectively solve the problem of digital product copyright protection directly affects the healthy and rapid development of digital products. [0003] Although there are many articles in the field of digital watermarking, most of the methods cannot be put into practical applications due to their limited effects. Among them, the bottleneck that restricts the application of existing technologies is that few digital watermarking technologies can effectively resist rotation attacks and scaling attacks. Some spatial domain watermarking algorithms can resist rotation and scaling attacks to a certain extent, but due to their sensitivity to noise and poor rob...
Claims
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