ch5_1_1 线性变换的matlab源程序：.m

%%%%% 5－1－1－1  线性变换的matlab源程序：X1=imread('E:\role0\001i.bmp');figure,imshow(X1);f0=0;g0=0;f1=10;g1=10f2=180;g2=1800;f3=255;g3=255;figure,plot([f0,f1,f2,f3],[g0,g1,g2,g3])axis tight,xlabel('f'),ylabel('g')title('intensitytransformation')%绘制变换曲线r1=(g1-g0)/(f1-f0);b1=g0-r1*f0;r2=(g2-g1)/(f2-f1);b2=g1-r2*f1;r3=(g3-g2)/(f3-f2);b3=g2-r3*f2;[m,n]=size(X1);X2=double(X1);for i=1:m    for j=1:n        f=X2(i,j);        g(i,j)=0;        if(f>=f1)&(f<=f2)            g(i,j)=r1*f+b2;        elseif(f>=f2)&(f<=f3)            g(i,j)=r3*f+b3;        end    endendfigure, imshow(mat2gray(g))