What steps will reproduce the problem?
1. Place glyph in front of your camera
2. Move/rotate it slowly
3. Preview recognition results

What is the expected output? What do you see instead?
The glyph should be found in case of slow movements/rorations. Right now it 
seems that current implementation looses it for a moment which causes to have 
this ugly effect - switching fourth and back between the image and the glyph.

I understand this is not an easy task to find the glyph but maybe you can 
workout the issue.