opencv.hpp头文件的内容为：

#ifndef __OPENCV_ALL_HPP__

#define __OPENCV_ALL_HPP__

#include "opencv2/core.hpp"
#include "opencv2/imgproc.hpp"
#include "opencv2/photo.hpp"
#include "opencv2/video.hpp"
#include "opencv2/features2d.hpp"
#include "opencv2/objdetect.hpp"
#include "opencv2/calib3d.hpp"
#include "opencv2/imgcodecs.hpp"
#include "opencv2/videoio.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/ml.hpp"

#endif


所以代码文件中直接添加：#include<opencv2/opencv.hpp>


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