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entropy.m
Package: work.rar [view]
Upload User: hwtw888
Upload Date: 2016-03-15
Package Size: 177k
Code Size: 0k
Category:
Compress-Decompress algrithms
Development Platform:
Matlab
- function SHAN = entropy(x, n)
- % 计算熵，n是图像 x的灰度级，如果 n是默认则 n = 256
- error(nargchk(1, 2, nargin));
- if nargin<2
- n = 256;
- end
- x = double(x);
- xh = hist(x(:), n);
- xh = xh/sum(xh(:));
- i = find(xh);
- SHAN = -sum(xh(i).*log2(xh(i)));
