How can I change the sampling period for an OpenCV frame on an Android device?

edit

What you could just do is take an average image over multiple frames, which will yield and average intensity result, which is exactly what you want to achieve right?

Hello!

I've never used OpenCV on Android, but, if I understood correctly the problem, I would give a try at the VideoCapture::set method to change the CV_CAP_PROP_EXPOSURE parameter. Though this would be a pretty rough solution to your problem.