matlab怎样灰度变换,四种灰度变换的matlab代码

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[filename,pathname]=uigetfile('*.bmp;*.tif;*.jpg;*.png','输入原图像'); file_name=[pathname filename];

I=imread(file_name);

disp('四种基本的灰度变换，请输入选择项');

disp('0--图像反转');

disp('1--对数变换');

disp('2--伽马变换');

disp('3--分段线性变换');

disp('4--直方图均衡');

d=input('please input you choice(请输入您的选择):');

switch d

case 0

J=double(I);

J=256-1-J;

H=uint8(J);

subplot(121),imshow(I);

subplot(122),imshow(H);

case 1

J=log(1+double(I));

subplot(121),imshow(I);

subplot(122),imshow(J,[]);

case 2

x=0:255;

a=80,b=1.8,c=0.009;

J=b.^(c.*(double(I)-a))-1;

y=b.^(c.*(x-a))-1;

subplot(2,2,1),imshow(I);

subplot(2,2,2),imhist(I);

subplot(2,2,3),imshow(J);

subplot(2,2,4),imhist(J);

figure,plot(x,y);

case 3

f0=0;g0=0;