Significant digital watermarking algorithm of hypercomplex number frequency domain
A digital watermarking and super-complex technology, which is applied in computing, image data processing, image data processing, etc., can solve the problem of large watermark capacity
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[0107] Let the color carrier image be f 0 , the watermark graphic wm is of size M m Row×N m Binary graph of columns. Arrange wm into a one-dimensional sequence, then there are M m ×N m data. The specific embodiment of the present invention embedding digital watermark in hypercomplex number frequency domain is as follows:
[0108] 1. First, carry out hypercomplex modeling on the color carrier image, that is, express its RGB (red, green, blue) model of each pixel as a pure hypercomplex form: f 0 (x,y)=R(x,y)i+G(x,y)j+B(x,y)k. Among them, (x, y) is the coordinate of the pixel in the color image, that is, the position of the row and column of the matrix where the pixel is located.
[0109] 2. Divide the color carrier image into 8×8 unit blocks, and perform super-complex Fourier transform for each 8×8 unit block according to the following formula:
[0110] f R (u,v)=i(real(R RFT )+μ·imag(R RFT ))
[0111] +j(real(G RFT )+μ·imag(G RFT ))
[01...
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