int main(int argc, char *argv[])
{

  FILE *fp;
  IplImage* img = 0; 
  int height,width,step,channels;
  uchar *data;
  int i,j;

  if(argcheight;
  width     = img->width;
  step      = img->widthStep;
  channels  = img->nChannels;
  data      = (uchar *)img->imageData;
  printf("Processing a %dx%d image with %d channels\n",height,width,channels); 

  fp=fopen("cal.txt","w");
  // invert the image
  // 相当于 cvNot(img);
  for(i=0;i<height;i++) 
   { 
      fprintf(fp,"\n第%d行Data:",i+1);
      for(j=0;j<width;j++)
       {
          fprintf(fp,"%d ",data[i*step+j]);
      }
  }

  return 0;
}