A block data compression method suitable for micro-nano satellites
A technology of block data and compression method, applied in the fields of image compression and hiding, and data transmission, can solve the problems of reducing the amount of transmitted data and increasing the complexity of implementation, so as to improve the quality of restored images, reduce the amount of transmitted data, and reduce the compression ratio. improved effect
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[0048] In order to verify the performance of the algorithm proposed in this paper, the experiment uses four 8-bit grayscale images with a size of 512×512 for simulation. The degree of image change is expressed in terms of peak signal-to-noise ratio (PSNR). Compression ratio r=4, R=4. K1*k2=4*4.
[0049] The implementation steps of a block data compression method suitable for micro-nano-satellites are as follows:
[0050] (1) Assuming that the size of the original image A1 is M*N, 8-bit quantization, the original image A1 is divided into non-overlapping blocks with a size of K1*K2, each block has X1, X2,...Xk gray values, k=K1 *K2; both K1 and K2 are positive integers; M=512, N=512, K1=4, K2=4, k=16
[0051] (2) Calculate the average gray level m of each non-overlapping block, and obtain a set B consisting of k=16 1-bit values Bj, j=1, 2,...k; where B satisfies the condition: if Xj≥m, Then Bj=1, otherwise Bj=0; calculate the average gray level L of Xj corresponding to Bj=...
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