X is not a member of 'cv'异常解决

以下四种异常：

'resize' is not a member of 'cv'

'cvtColor' is not a member of 'cv'
'putText' is not a member of 'cv'

'rectangle' is not a member of 'cv'

解决方法：都是加上头文件：

#include "opencv2/imgproc/imgproc.hpp"

(ofc, you have to link opencv_imgproc, too)

#include "opencv2/opencv.hpp"convertro是opencv/core库里面的如果报下面的错：VideoTest.cpp:(.text+0x6f): undefined reference to `cv::VideoWriter::fourcc(char,char,char, char)'
VideoTest.cpp:(.text+0xc3): undefined reference to `cv::VideoWriter::open(cv::String const&, int, double, cv::Size_<int>, bool)'
VideoTest.cpp:(.text+0x103): undefined reference to `cv::namedWindow(cv::String const&, int)'
VideoTest.cpp:(.text+0x146): undefined reference to `cv::VideoCapture::read(cv::_OutputArray const&)'
VideoTest.cpp:(.text+0x1b1): undefined reference to `cv::imshow(cv::String const&, cv::_InputArray const&)'解决方法是：


#include "opencv2/videoio.hpp"also, you don't seem to link to any of the required opencv libs, those are:opencv_core, opencv_videoio, opencv_highgui

参考网页：

http://stackoverflow.com/questions/27146818/opencv-resize-is-not-a-member-of-cv-opencv-basics

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