1、絕對值差函式imabstiff

   I=imread('cameraman.tif');
   J=uint8(filter2(fspecial('gaussian'),I));
   K=imabsdiff(I,J);
   imshow(I);
   imshow(K,[]);</span>

2、影象的疊加函式imadd

   I=imread('rice.png');
   J=imread('cameraman.tif');
   K=imadd(I,J,'uint16');
   imshow(I);
   imshow(J);
   imshow(K,[]);</span>
 

實際上imadd還可以通過制定常數引數增強一張影象的亮度，如下：

   I=imread('rice.png');
   J=imadd(I,50);
   subplot(121),imshow(I);
   subplot(122),imshow(J);</span>

3、影象求補函式imcomplement

   bw = imread('text.png');
   bw2 = imcomplement(bw);
   subplot(121),imshow(bw);
   subplot(122),imshow(bw2);</span>
 

4、影象的除法運算imdivide

   I=imread('rice.png');
   blocks=blkproc(I,[32 32],'min(x(:))');
   background=imresize(blocks,[256 256],'bilinear');
   Ip=imdivide(I,background);
   subplot(121),imshow(I);
   subplot(122),imshow(Ip,[]);</span>

如果將引數變成常數：

   I=imread('rice.png');
   J=imdivide(I,2);
   subplot(121),imshow(I);
   subplot(122),imshow(J);</span>
 

執行結果如下：

5、線性組合函式imlincomb

   I=imread('cameraman.tif');
   J=uint8(filter2(fspecial('gaussian'),I));
   K=imlincomb(1,I,-1,J,128);
   subplot(121),imshow(I);
   subplot(122),imshow(K);</span>

6、影象的乘法操作immultiply

   I=imread('moon.tif');
   J=immultiply(I,0.5);
   subplot(121),imshow(I);
   subplot(122),imshow(J);</span>

7、影象的減法函式imsubtract

   I=imread('rice.png');
   blocks=blkproc(I,[32 32],'min(x(:))');
   background=imresize(blocks,[256 256],'bilinear');
   Ip=imsubtract(I,background);
   subplot(121),imshow(I);
   subplot(122),imshow(Ip,[]);</span>