What is the fastest way to check if the image (pixels) is black

Sorry for my stupid question but,
I’m getting user’s masks pixels like this recordUser.getUserPixels(1) (for user #1),

but I need to check if the mask is entirely black, what is the fastest way to do it?

cast it in to an opencv mat and use theOverAllColor = mean(myMat);

Thanks it works :slight_smile:

If anyone like to use this - there is a good example I’ve used, but have forget,
http://pkmital.com/home/teaching/computer-vision-workshop/ section "Motion Tracking + Interactive Video Player "