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error: ‘filter2D’ was not declared in this scope错误原因：google： 'filter2D' : is not a member of 'cv' 没有添加对应的库：#include<opencv2/imgproc/imgproc.hpp>

pip install XXXTraceback (most recent call last):  File "/usr/bin/pip", line 11, in <module>    load_entry_point('pip==10.0.1', 'console_scripts', 'pip')()  File "/usr/lib/python3.6/site-package...