Cộng đồng Hỏi & Đáp của Inflearn

Traceback (most recent call last):

  File "D:/001_DataAnalysisTools/pythonProject3/ex_opencv/main.py", line 790, in <module>

    auto_scan_image_via_webcam()

  File "D:/001_DataAnalysisTools/pythonProject3/ex_opencv/main.py", line 737, in auto_scan_image_via_webcam

    if len(screenCnt) == 0:

UnboundLocalError: local variable 'screenCnt' referenced before assignment

STEP 1: Edge Detection

[ WARN:0] global D:\a\opencv-python\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (438) `anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback