matlab学习：图像的加减乘除操作

1. 图像加法

imgRice = rgb2gray(imread('rice.png'));

imgCameraman = imread('cameraman.tif');
imgCameraman = imgCameraman(:,1:255);

addimg = imadd(imgRice,imgCameraman);
figure,
subplot(131),imshow(imgRice);
subplot(132),imshow(imgCameraman);
subplot(133),imshow(addimg);

注意的地方，相加的两张图片的尺寸大小和维度应该是一样的。

2. 数值加法

imgflower = imread('flower.tif');
imgAddFlower = imadd(imgflower,30);
figure,
subplot(121),imshow(imgflower);
subplot(122),imshow(imgAddFlower);

结果

注意，如果原来是比较白的部分，会出现溢出限制，变成255；

imgTire = imread('tire.tif');
[m,n]=size(imgTire);
imgeight = imread('eight.tif');
c = imgeight;
imgTire = im2double(imgTire);
imgeight = im2double(imgeight);
c = im2double(imgeight);

for i =1:m
    for j = 1:n
        c(i,j) = imgTire(i,j)+imgeight(i,j);
    end
end

diff=imabsdiff(c,imgeight);
figure,
subplot(221),imshow(imgTire);
subplot(222),imshow(imgeight);
subplot(223),imshow(c);
subplot(224),imshow(diff);