先贴代码：
// testcv.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include "cv.h" #include "highgui.h" #include "cxcore.h" int main(int argc, char* argv[]) { IplImage* src=cvLoadImage("D:\\360安全浏览器下载\\BB\\2000.jpg",-1); int height=src->height; int width=src->width; int channels=src->nChannels; int depth=src->depth; int step=src->widthStep; IplImage* img=cvCreateImage(cvSize(width,height),depth,channels); uchar* data1=(uchar *)img->imageData; uchar* data2=(uchar *)src->imageData; for(int i=0;i<height;i++) for(int j=0;j<width;j++) { if(i==0||j==0) { data1[i*step+j*channels+0]=128; data1[i*step+j*channels+1]=128; data1[i*step+j*channels+2]=128; } else { data1[i*step+j*channels+0]=(uchar)(data2[i*step+j*channels+0]-data2[(i-1)*step+(j-1)*channels+0]+255)/2; data1[i*step+j*channels+1]=(uchar)(data2[i*step+j*channels+1]-data2[(i-1)*step+(j-1)*channels+1]+255)/2; data1[i*step+j*channels+2]=(uchar)(data2[i*step+j*channels+2]-data2[(i-1)*step+(j-1)*channels+2]+255)/2; } } cvNamedWindow("win1"); cvShowImage("win1",src); cvNamedWindow("win2"); cvShowImage("win2",img); cvWaitKey(0); cvReleaseImage(&src); cvDestroyWindow("win1"); cvSaveImage("D:\\360安全浏览器下载\\BB\\2001.jpg",img); cvReleaseImage(&img); cvDestroyWindow("win2"); return 0; } 效果图：
实现原理：每个位置像素个分量减去其左上角位置像素相应个分量，然后加上255再除以2，得此效果。
