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