#include "cv.h"
#include "highgui.h"
#include"stdlib.h"
#include"stdio.h"
#include"math.h"
void main()
{
int tmp[8]={0};
int sum=0;
int k=0;
IplImage* img;
IplImage* dst;
img=cvLoadImage("lena.jpg",0);
CvScalar s;
if( !img)//载入失败
{
printf("could not load image file\n");
}
else
{
cvNamedWindow("img",0);
cvNamedWindow("dst",0);
cvShowImage("img",img);
uchar* data=(uchar*)img->imageData;
int step=img->widthStep;
dst=cvCreateImage(cvSize(img->width,img->height),img->depth,1);
dst->widthStep=img->widthStep;
for(int i=1;i<img->height-1;i++)
for(int j=1;j<img->width-1;j++)
{
if(data[(i-1)*step+j-1]>data[i*step+j]) tmp[0]=1;
else tmp[0]=0;
if(data[i*step+(j-1)]>data[i*step+j]) tmp[1]=1;
else tmp[1]=0;
if(data[(i+1)*step+(j-1)]>data[i*step+j]) tmp[2]=1;
else tmp[2]=0;
if (data[(i+1)*step+j]>data[i*step+j]) tmp[3]=1;
else tmp[3]=0;
if (data[(i+1)*step+(j+1)]>data[i*step+j]) tmp[4]=1;
else tmp[4]=0;
if(data[i*step+(j+1)]>data[i*step+j]) tmp[5]=1;
else tmp[5]=0;
if(data[(i-1)*step+(j+1)]>data[i*step+j]) tmp[6]=1;
else tmp[6]=0;
if(data[(i-1)*step+j]>data[i*step+j]) tmp[7]=1;
else tmp[7]=0;
for(k=0;k<=7;k++)
sum+=abs(tmp[k]-tmp[k+1]);
sum=sum+abs(tmp[7]-tmp[0]);
if (sum<=2)
s.val[0]=(tmp[0]*128+tmp[1]*64+tmp[2]*32+tmp[3]*16 +tmp[4]*8+tmp[5]*4+tmp[6]*2+tmp[7]);
// s.val[0]=(abs(tmp[0]-tmp[1])*128+abs(tmp[1]-tmp[2])*64+abs(tmp[2]-tmp[3])*32+abs(tmp[3]-tmp[4])*16
// +abs(tmp[4]-tmp[5])*8+abs(tmp[5]-tmp[6])*4+abs(tmp[6]-tmp[7])*2+abs(tmp[7]-tmp[0]));
else s.val[0]=59;
cvSet2D(dst,i,j,s);
}
cvShowImage("dst",dst);
cvWaitKey(0);
cvDestroyWindow("img");
cvReleaseImage(&img);
cvDestroyWindow("dst");
cvReleaseImage(&dst);
}
}
