OpenCV函数学习之cvAbsDiff

cvAbsDiff
Calculates absolute difference between two arrays.
void cvAbsDiff(const CvArr* src1, const CvArr* src2, CvArr* dst);
src1 The first source array
src2 The second source array
dst The destination array
The function calculates absolute difference between two arrays.
dst(i)c = |src1(I)c − src2(I)c |
All the arrays must have the same data type and the same size (or ROI size).

这是文档中关于这个函数的介绍

它可以把两幅图的差的绝对值输出到另一幅图上面来

在QQ游戏里面有一款叫做"我们来找茬",就是要找两幅图的不同点

好啦,我们来具体看看例子吧

  
  

   
   #include 
   
   <
   
   stdlib.h
   
   >
   
   
#include 
   
   <
   
   stdio.h
   
   >
   
   
#include 
   
   <
   
   cv.h
   
   >
   
   
#include 
   
   <
   
   highgui.h
   
   >
   
   


   
   int
   
    main(
   
   int
   
    argc, 
   
   char
   
    
   
   *
   
   argv[])
{
 IplImage
   
   *
   
    img1, 
   
   *
   
   img2, 
   
   *
   
   img3;

 
   
   if
   
   (argc
   
   <
   
   3
   
   ){
 printf(
   
   "
   
   Usage: main <image-file-name>\n\7
   
   "
   
   );
 exit(
   
   0
   
   );
 }
 
 img1
   
   =
   
   cvLoadImage(argv[
   
   1
   
   ]);
 img2
   
   =
   
   cvLoadImage(argv[
   
   2
   
   ]);
 
 
   
   if
   
   (
   
   !
   
   img1 
   
   ||
   
    
   
   !
   
   img2){
 printf(
   
   "
   
   Could not load image file\n
   
   "
   
   );
 exit(
   
   0
   
   );
 }
 
 img3 
   
   =
   
    cvCreateImage(cvGetSize(img1),img1
   
   ->
   
   depth,img1
   
   ->
   
   nChannels);
 cvAbsDiff(img1,img2,img3);

 cvNamedWindow(
   
   "
   
   img1
   
   "
   
   , CV_WINDOW_AUTOSIZE);
 cvNamedWindow(
   
   "
   
   img2
   
   "
   
   , CV_WINDOW_AUTOSIZE);
 cvNamedWindow(
   
   "
   
   img3
   
   "
   
   , CV_WINDOW_AUTOSIZE);
 cvShowImage(
   
   "
   
   img1
   
   "
   
   , img1 );
 cvShowImage(
   
   "
   
   img2
   
   "
   
   , img2 );
 cvShowImage(
   
   "
   
   img3
   
   "
   
   , img3 );
 cvWaitKey(
   
   0
   
   );
 cvReleaseImage(
   
   &
   
   img1);
 cvReleaseImage(
   
   &
   
   img2);
 cvReleaseImage(
   
   &
   
   img3);
 
   
   return
   
    
   
   0
   
   ;
}
  
  

看看效果:

哈哈,看看左下角得图吧,清楚的显示了上面两幅图有4处不同之处,你都看出来了吗?

当然,游戏就是游戏,如果使用作弊手段,那有失去了很多的感情