Processing the video frames

In this recipe, our objective is to apply some processing function to each of the frames of a video sequence. We will do this by encapsulating the OpenCV video capture framework into our own class. Among other things, this class will allow us to specify a function that will be called each time a new frame is extracted.

How to do it...

What we want is to be able to specify a processing function (a callback function) that will be called at each frame of a video sequence. This function can be defined as receiving a cv::Mat instance and outputting a processed frame. Therefore, we designed it to have the following signature:

void processFrame(cv::Mat& img, cv::Mat& out);

As an example of such processing function, consider ...

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