www.gusucode.com > matlab像素级图像处理显示处理结果 > code11/code/duishubianhuan.m
%对数变换 I=imread('001.jpg'); a=isgray(I); b=isrgb(I); r=I(:,:,1); g=I(:,:,2); b=I(:,:,3); [M,N]=size(r) for i=1:M; for j=1:N; J(i,j)=0.2989*r(i,j)+0.5870*g(i,j)+0.1140*b(i,j); end end figure; imshow(uint8(J)); %显示灰度图像 J=double(J); [M,N]=size(J); for i=1:M for j=1:N J(i,j)=38*log(1+J(i,j));%在公式s=c*log(1+r)中,随C值的增大图像变亮 end end figure(); imshow(uint8(J)); %显示对数变换后的图像 title('对数变换');