li6_28.rar_源码

clear all; I=imread('saturn.png'); I=rgb2gray(I); subplot(131);imshow(I); xlabel('(a)原始图像'); [m,n]=size(I); L=255; %后续减1 R=zeros(m,n); G=zeros(m,n); B=zeros(m,n); for i=1:m for j=1:n if I(i,j)<(L)/4 R(i,j)=1; G(i,j)=4*I(i,j); B(i,j)=L; else if I(i,j)<=L/2 R(i,j)=1; G(i,j)=L; B(i,j)=-4*I(i,j)+2*L; else if I(i,j)<=3*L/4; R(i,j)=4*I(i,j)-2*L; G(i,j)=L; B(i,j)=1; else R(i,j)=L; G(i,j)=-4*I(i,j)+4*L; B(i,j)=1; end end end end end %亮度值最大值转换为255 R=R-1; G=G-1; B=B-1; Im=cat(3,R,G,B); subplot(132);imshow(uint8(Im)); xlabel('(c)亮度值转换') %把灰度图像I分成8层 I=double(I); J=floor(I/32); %对图像数组进行等分层处理 R=floor(J/4); G=rem(floor(J/2),2); B=rem(J,2); %灰度与彩色变换关系 Im=cat(3,R,G,B); %组成m×n×3图像数组 subplot(133);imshow(Im) xlabel('(c)灰度与彩色变换')