https://digiconfactory.tistory.com/entry/%EC%BB%B4%ED%93%A8%ED%84%B0-%EB%B9%84%EC%A0%84-%ED%8C%8C%EC%9D%B4%EC%8D%AC-opencv-%EB%8F%99%EC%98%81%EC%83%81-%ED%8C%8C%EC%9D%BC-%EC%9E%AC%EC%83%9D%ED%95%98%EA%B8%B0
