Code computes histogram equalization not similar to Matlab's histeq function

9 次查看(过去 30 天)
I have a written a simple code for histogram equalization based on this formula: HistEq = (max gray leve/total no of pixels)*cumulative sum(count). I wonder why the result is quite different from Matlab's function histeq? Can someone please figure out where I am wrong?
clear;
clc;
% Input image
Img = imread('lena.bmp');
I = double(Img);
[H, W] = size(I);
total = H * W;
count = imhist(Img);
maxL = 255;
csum = 0; % Initialize to zero
cumuSum = zeros(1, length(count))';
for idx = 1 : length(count)
csum = csum + count(idx);
cumuSum(idx) = csum;
end
HistEq = round(maxL/total * cumuSum);
HIm = zeros(H, W);
for idx = 1 : H
for idy = 1 : W
HIm(idx, idy) = HistEq(Img(idx, idy));
end
end
<<
>>

回答(1 个)

xiao
xiao 2018-5-11
you can refer the function (histogram equalization) doc page and there are related references, then you can check the algorithm details.

类别

Help CenterFile Exchange 中查找有关 Histograms 的更多信息

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by