OpenCV 2.3: Convert Mat to RGBA pixel array

Question

I am attempting to use OpenCV to grab frames from a webcam and display them in a window using SFML.

VideoCapture returns frames in OpenCV\'s Mat format. To display t

Answer 1

OpenCV can do all job for you:

VideoCapture cap(0);
Mat frame;
cap >> frame;

uchar* camData = new uchar[frame.total()*4];
Mat continuousRGBA(frame.size(), CV_8UC4, camData);
cv::cvtColor(frame, continuousRGBA, CV_BGR2RGBA, 4);
img.LoadFromPixels(frame.cols, frame.rows, camData);