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circle.m

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+m = 250; %设置图片大小
+n = 250;
+a = zeros(m,n,3);
+
+x = linspace(-n,n,n); %建立图片坐标
+y = linspace(m,-m,m);
+[X,Y] = meshgrid(x,y);
+
+theta = atan2(-X,-Y); %计算坐标点对应的角度，转化到0~1范围作为h分量
+theta = theta - min(min(theta));
+theta = theta/max(max(theta));
+
+radius = sqrt(X.^2 + Y.^2); %计算坐标点对应的径向坐标
+rmax = radius(round(n/8),round(m/2)); %选取最大半径值
+radius(radius>rmax) = 0; %最大半径以外赋值为0,即外圈饱和度为0
+r = radius/rmax; %转换到0~1范围作为s分量
+
+value = 1; %设置亮度值范围0~1，亮度只针对园形区域范围内
+v = ones(m,n);
+v(r>0) = value;
+
+figure(1);
+subplot(1,3,1),imshow(theta),title('h'),colorbar;
+subplot(1,3,2),imshow(r),title('s'),colorbar;
+subplot(1,3,3),imshow(v),title('v'),colorbar;
+
+a(:,:,1) = theta;
+a(:,:,2) = r;
+a(:,:,3) = v;
+
+a = hsv2rgb(a); %赋值三个分量后转换为rgb
+figure(2);
+imshow(a);
+imwrite(a,'circle.bmp');

rectangular.m

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+m = 200; %设置图片大小为m*n
+n = 250;
+a = zeros(m,n,3);
+
+x = linspace(0,1,n);
+y = linspace(1,0,m);
+[X,Y] = meshgrid(x,y); %按照坐标生成分量
+
+h = X;
+s = Y;
+value = 1; %设置亮度分量的值，范围0~1,此时为全图统一亮度情况
+v = ones(m,n)*value;
+
+% x = linspace(0,1,n); %此段四行注释为设置亮度分量为渐变值，范围0.4~1,
+% y = linspace(1,0.4,m); %此时为全图不统一亮度情况
+% [X,Y] = meshgrid(x,y);
+% v = ones(m,n).*Y; 
+
+figure(1);
+subplot(1,3,1),imshow(h),title('h'),colorbar;
+subplot(1,3,2),imshow(s),title('s'),colorbar;
+subplot(1,3,3),imshow(v),title('v'),colorbar;
+
+a(:,:,1) = h;
+a(:,:,2) = s;
+a(:,:,3) = v;
+a = hsv2rgb(a); %赋值三个分量后转换为rgb
+figure(2);
+imshow(a);
+imwrite(a,'rectangular.bmp');