使用OpenCV获取图像中某一点的像素值和修改某一点的像素值

int my_getpixel()
{
IplImage *img=cvLoadImage("D:\\Case\\Train1.bmp",1);
CvScalar s;
for(int i=0;i<img->height;i++){
for(int j=0;j<img->width;j++){

s=cvGet2D(img,i,j); // get the (i,j) pixel value
printf("B=%f,G=%f,R=%f\n",s.val[0],s.val[1],s.val[2]);

s.val[0]=111;
s.val[1]=111;
s.val[2]=111;
cvSet2D(img,i,j,s);//set the (i,j) pixel value
}
}

system("pause");
cvNamedWindow("Image",1);

cvShowImage("Image",img);
cvWaitKey(0); //等待按键

cvDestroyWindow( "Image" );//销毁窗口
cvReleaseImage( &img ); //释放图像
return 1;
}