image_histeq.m

来自「各种SVM分类算法」· M 代码 · 共 32 行

function [Tmp]=image_histeq(Gray_img)
%  image_histeq
%  Author: Zou Zhihuang
%  Data:   2008.1.23
% Input
%      Gray_img  -- the  gray image  
% Output:
%      Tmp - result Image of image_histeq
% Version 1: 2008.1.23

[W_in,H_in,dim]=size(Gray_img);
l=W_in*H_in;
Tmp=zeros(size(Gray_img));  
lus = zeros(1,256);
pas = zeros(1,256);
for i = 1:W_in
    for j = 1:H_in
        lus(Gray_img(i,j)+1)=lus(Gray_img(i,j)+1)+1;  %统计各灰度像素个数
    end
end
for i = 2:256
    pro(i) =lus(i)/l;    %算灰度分布概率
    pas(i) =pas(i-1)+pro(i);    %灰度累计分布概率
end
for i=1:W_in
    for j=1:H_in
        Tmp(i,j)=255*pas(Gray_img(i,j)+1);
    end
end
Tmp=uint8(Tmp);