How do i access rgb or any color data from UMat? For example before i was accesing the color data like ForegroundImage.at<cv::vec3b>(y,x) But this same code is not working for UMat. I am trying to use Umat for preformance reason.
You use method getMat with parameter access flag
There is an example in cam_shift.cpp
You cannot access to gpu data. Method getMat make a copy of gpu data to cpu and when it is finished copy cpu data to gpu
example
UMat w;
...
// get access to UMat
{
Mat b= w.getMat(cv::ACCESS_READ);
b.at<Vec3b>(Point(10,12)) = Vec3b(17,15,14);
} // b object is copy to gpu and b is destroyed (cpu memory used)
Ok, but how to define the x and y position in this methode and how to read the rgb value of that pixel only? can u show small eg. code or line? cas i didn't understood and see how it is done their.
Asked: 2020-01-08 12:36:48 -0600
Seen: 407 times
Last updated: Jan 09 '20
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