生成3个整数随机数代表rgb通道值, 即随机彩色

H = 400;
W = 600;
imgvertical = uint8(zeros(H,W,3));
imghorizontal = uint8(zeros(H,W,3));

leftThres = 100;
rightThres = 200;

pixelstep = 10;  % 条纹大小
numsV = W / pixelstep;
numsH = H / pixelstep;
for i = 1:numsV
    r = randi([leftThres,rightThres],1,3);  % 改变left  right, 即改变整体颜色
    imgvertical(:,1 + (i - 1)*pixelstep:i * pixelstep,1) = r(1);  % 竖条纹
    imgvertical(:,1 + (i - 1)*pixelstep:i * pixelstep,2) = r(2);
    imgvertical(:,1 + (i - 1)*pixelstep:i * pixelstep,3) = r(3);
end

for i = 1:numsH
    r = randi([leftThres,rightThres],1,3);  % 改变left  right, 即改变整体颜色
    imghorizontal(1 + (i - 1)*pixelstep:i * pixelstep,:,1) = r(1);  % 竖条纹
    imghorizontal(1 + (i - 1)*pixelstep:i * pixelstep,:,2) = r(2);
    imghorizontal(1 + (i - 1)*pixelstep:i * pixelstep,:,3) = r(3);
end


figure
subplot(121)
imshow(imgvertical)
title('Vertical')

subplot(122)
imshow(imghorizontal)
title('Horizontal')

输出结果如下: