title: How to check Camera is covered or not using openCV?
body: <p>I am using open CV 3.4. I am getting feed from an RTSP input camera. I want to add a condition in my code such that if camera is covered using any thing Alert should go to user. Checking blackness of the frame doesn't do any justice because when covered with white color cloth, the frame will be white. Can anyone suggest some logic for this? How can we accomplish this using openCV?</p>