Method and apparatus for embedding and extracting image watermarking based on BP and RBF neural networks
A BP neural network and image watermarking technology, applied in image data processing, image data processing, instruments, etc., can solve the problem of low confidentiality of watermarked images
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[0048] 1. Image watermark embedding and extraction method based on BP and RBF neural network, the steps are as follows:
[0049] (1) Watermark image scrambling
[0050] Scramble the original watermark image W with a size of 64×64, where W(i,j) is the pixel value of the original watermark image at position (i,j), that is, W={W(i,j),1≤ i≤64, 1≤j≤64}. The original watermark image is scrambled by affine transformation. According to the relationship between the original watermark image and the scrambled watermark image, the encrypted scrambled watermark image is obtained through the BP neural network algorithm, and the affine transformation is combined with the BP neural network. Double encryption of watermarked images.
[0051] (1) Affine transformation
[0052] In this embodiment, an improved affine transformation formula is used to transform the original watermark image to obtain a scrambled image. The affine transformation expression is as follows:
[0053] When x
[0054...
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