Semi-fragile digital watermaking system based on non-redundant Contourlet conversion
A digital watermarking and non-redundant technology, applied in image data processing, instruments, electrical components, etc., can solve problems such as low inspection accuracy, difficulty in balancing robustness and semi-fragility, and difficulty in tampering area authentication and positioning. Achieve the effect of improving detection accuracy, realizing authentication and positioning
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[0070] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0071] figure 1 is the module relationship diagram of the watermarking system. As shown in the figure, the semi-fragile digital watermarking system based on non-redundant Contourlet transform includes five parts: watermark generation module, watermark embedding module, watermark extraction module, watermark detection module and watermark authentication module. Watermark generation module: When the size of the original image is m×m, a watermark with a size of m / 4×m / 4 is generated, and the watermark is composed of a pseudo-binary random sequence {0, 1}.
[0072] figure 2 It is the workflow diagram of the watermark embedding module. As shown in the figure, in the watermark embedding module, first, the original image is decomposed into 2-level non-redundant Contourlet transform to obtain 12 subbands, and 12 sets of parent-child coefficient relationship...
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