Volume data watermarking method based on three-dimensional DWT-DCT perception Hash and chaos
A DWT-DCT, perceptual hashing technology, applied in image data processing, image data processing, instruments, etc., can solve the problem of increasing the difficulty of embedding multiple watermarks, and achieve strong resistance to conventional attacks, high practical value, and a wide range of applications. Effect
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[0127] The present invention will be further described below in conjunction with the accompanying drawings, and a meaningful binary image is selected as the original multi-watermark, which is denoted as W={w(i,j)|w(i,j)=0,1; 1≤i ≤M1,1≤j≤N1}, see Figure 28 , where the size of the watermark is 32×32. Watermark after chaotic scrambling through Logistic Map, see Figure 29 , it can be clearly seen that the watermark has changed a lot, and the security has improved. The simulation platform is Matlab2010a, a slice of the original medical volume data is shown in Figure 5 , is taken from the magnetic resonance three-dimensional image volume data (MRI.mat) that comes with matlab. The size of the volume data is 128x128x27, see Figure 9 . The original volume data is expressed as F(i,j,k), where 1≤i,j≤128; 1≤k≤27, and the corresponding three-dimensional DWT-DCT coefficient matrix is FD(i,j,k), where 1≤ i,j≤128; 1≤k≤27. Considering the robustness and capacity of embedding multip...
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