2-15

• 0:26:58: Q1. what should the argument of waitKey if I want 20 frames per second? ANS: 50

• 0:40:11: Q2. Why not much change even I change the filter size? ANS: increasing filter size will just add more zeros giving fixed filter sigma

• 1:01:41: Q3 what should be low_th[0] here? min_th or max_th? ANS: min_th