原因分析:
In OpenCV 3 for C++ you have to use cv::ImreadModes::IMREAD_GRAYSCALE which is located on
解决方法:
应该用:
cv2.IMREAD_GRAYSCALE
说明:
...
IMREAD_ANYCOLOR = 4
IMREAD_ANYDEPTH = 2
IMREAD_COLOR = 1
IMREAD_GRAYSCALE = 0 #that will be it ;)
IMREAD_LOAD_GDAL = 8
IMREAD_UNCHANGED = -1
...
VERSION
3.0.0-dev