c++ - 在opencv中获取一个像素的Y值[Ycbcr]

Question

我正在尝试从处于 Ycbcr 颜色模式的帧中获取像素的 Y 值。这是我写的:

 cv::Mat frame, Ycbcrframe, helpframe;
 ........ 
cvtColor(frame,yCbCrFrame,CV_RGB2YCrCb); // converting to Ycbcr
Vec3b intensity =yCbCrFrame.at<uchar>(YPoint);
uchar yv  = intensity.val[0]; //  I thought it's my Y value but its not, coz he gives me I think the Blue channel of RGB color space 

知道怎么做才是正确的

Answer 1

下面的代码呢？

Vec3f Y_pix = YCbCrframe.at<Vec3f>(rows, cols);
int pixelval = Y_pix[0];

(注:我还没试过)