Hoàng Lê Hải Thanh

Please give more detail about your problem

Hi @animeshkalita82, You can add an `if` condition before the `cvtColor` function to make sure `roi` is not empty

Hi @animeshkalita82, Sorry but I haven't had any activities on this repo for years, so it is hard for me to check whether it works or not. Anw, if your...