Image watermarking method based on phase singular value correction
An image watermarking and singular value technology, applied in image enhancement, image data processing, image data processing, etc., can solve problems such as poor resistance, and achieve good learning ability, high robustness, and good invisibility effects
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[0037] The method of the invention includes three stages: watermark embedding, geometric correction and watermark extraction.
[0038] Convention: I refers to the host image; x and y represent the number of rows and columns of the image respectively; w refers to the binary watermark image with a size of ; LL represents the watermark coefficient to be embedded; is the quantization step size; Represents a watermarked image; Indicates the corrected watermarked image; EW indicates the extracted watermark information.
[0039] Specific steps such as Figure 5 Shown:
[0040] a.Initial settings
[0041] Get the host image and initialize the settings;
[0042] b. Watermark embedding
[0043] b.1 The original image I undergoes a secondary pyramidal dual-tree directional filter bank (PDTDFB) transformation;
[0044] b.2 Perform block processing on the low-frequency sub-band coefficients of PDTDFB transformation, and the size of each block is ;
[0045] b.3 Modify the wat...
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