%?This?code?is?written?according?to?the?following?paper
%?“A?Space-Variant?Luminance?Map?based?Color?Iamge?Enhancement“Sungmok?Lee
%?etal.
%?This?algorithm?can?enhance?the?luminance?while?preserving?details.
clear?all;
close?all;
%?顯示文件打開對話框
[FileNamePathName]=uigetfile（{‘*.png‘;‘*.jpg‘}‘Open?an?Image?File‘）;
img?=?imread（[PathName?FileName]）;
figureimshow（img）;
img=double（img）;
Rimg=img（::1）;
Gimg=img（::2）;
Bimg=img（::3）;
Lum=0.299*Rimg+0.587*Gimg+0.114*Bimg;
%?高斯濾波
sigma=15;
w=31;
w1=31;
[x?y]=meshgrid（-w:w-w1:w1）;
%高斯函數
G=1/（2*pi*sigma^2）*exp（-（x.^2+y.^2）/（2*sigma^2））;
LumSmooth=imfilter（LumG‘conv‘）;
%?figureimshow（uint8（LumSmooth））;
%?亮度增強
r=0.25.^（（128.0-LumSmooth）/128.0）;
Lumout=255.0*（Lum/255.0）.^r;
figureimshow（uint8（Lumout））;
%?對比度增強?
sigma1=std2（Lum（:））;
if?sigma1<=70
????P=2.4;
else?if?sigma1>100
????????P=1.0;
????else
????????P=-0.025*sigma1+3;
????end
end
E=（LumSmooth./（Lumout+eps（0.005）））.^P;
S=255*（（Lumout/255）.^E）

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件??????618597??2014-03-21?09:35??A?Space-Variant?Luminance?Map?based?Color?Iamge?Enhancement\16112756-d5450cd7e48748cd8c8232a9f4e8b57b.png
?????文件??????148135??2014-03-21?09:37??A?Space-Variant?Luminance?Map?based?Color?Iamge?Enhancement\16141137.png
?????文件??????942091??2005-03-26?18:06??A?Space-Variant?Luminance?Map?based?Color?Iamge?Enhancement\A?Space-Variant?Luminance?Map?based?Color?Image?Enhancement.pdf
?????文件????????1378??2014-12-11?15:46??A?Space-Variant?Luminance?Map?based?Color?Iamge?Enhancement\ASLMCIEdemo.m