c++ - OpenCV rgb value for cv::Point in cv::Mat

Question

I've looked at different questions already here on StackOverflow, but none seems to helps. What I want to do is quite simple: I have a cv::Point and I need to get the RGB value for the pixel at that point in a cv::Mat so that I can compare it with a stored RGB value.

Now this should be very easy but I've tried 1001 different ways and it just doesnt work for me.

Someone please help me out of my misery!!

edit: both answers below work! I'm kinda new with C++ and didn't know that outputting a unsigned char through cout gives a questionmark! printf offcourse gives the right value!!

Answer 1

That's really easy. However the documentation of OpenCV is good at hiding the simple answers.

Here is example code:

cv::Mat3b image = imread(filename);
cv::Point point(23, 42);
cv::Vec3b template;
template[0] = 128; template[1] = 12; template[2] = 64;

const cv::Vec3b& bgr = image(point);
if (bgr[0] == template[0] && bgr[1] == template[1] && bgr[2] == template[2])
   std::cout << "Colors match!" << std::endl;

There are probable better ways of dealing with the cv::Vec, but I forgot. See also the OpenCV Cheat Sheet.