shuzituxiang.rar_仿射_仿射变换_图像仿射 matlab_图像灰度变换_灰度图像仿射变换

%读取图像灰度矩阵 r=imread('C:\Users\raoqiang\Desktop\转发：第一次作业\lena.bmp'); I=im2double(r); [row,col]=size(I)%求图形矩阵的行列 J1=zeros(row,col);%J1作为中间变量进行灰度变换 %分级显示1—8灰度的图像 for k=1:8%灰度从2^1到2^8级显示 a=[2 4 8 16 32 64 128 256]; for i=1:row for j=1:col J1(i,j)=floor(a(k)/256*r(i,j)); end end figure(1) imshow(r) figure(2) subplot(2,4,8-k+1)%分区域显示图像 imshow(J1,[0,a(k)]) J1=uint8(J1); end %求灰度平均值 s=0 for i=1:512 for j=1:512 s=s+I(i,j); end end s s=s*255/(512*512) %求图像方差 p=0; for i=1:512 for j=1:512 p=p+(255*I(i,j)-s)*(255*I(i,j)-s); end end p=p/(512*512) %分别用最邻近插值、双线性插值、双三次插值对图像进行放大 [h1,h2,h3]=change(r); imwrite(h1,'C:\Users\raoqiang\Desktop\转发：第一次作业\第四问\lena1.bmp') imwrite(h2,'C:\Users\raoqiang\Desktop\转发：第一次作业\第四问\lena2.bmp') imwrite(h3,'C:\Users\raoqiang\Desktop\转发：第一次作业\第四问\lena3.bmp')