万能opencv2/opencv.hpp"

1.opencv.hpp位置

该头文件位于*\opencv\sources\include\opencv2

比如下面就是该文件在我的机器上位置： 
D:\opencv2.4.10\opencv\sources\include\opencv2\opencv.hpp

2.opencv.hpp内容

通常在查看opencv库文件时，转到定义(F12)，我们会发现库文件开头都会声明

#include "opencv2/core/version.hpp"

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#ifndef __OPENCV_ALL_HPP__
#define __OPENCV_ALL_HPP__

#include "opencv2/core/core_c.h"
#include "opencv2/core/core.hpp"
#include "opencv2/flann/miniflann.hpp"
#include "opencv2/imgproc/imgproc_c.h"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/photo/photo.hpp"
#include "opencv2/video/video.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/calib3d/calib3d.hpp"
#include "opencv2/ml/ml.hpp"
#include "opencv2/highgui/highgui_c.h"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/contrib/contrib.hpp"

#endif

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如果仔细观察，我们就可以看到，在该头文件中已经包含了OpenCV中各个模块的头文件，换句话说我们在一般情况下，只需要引用

#include<opencv2/opencv.hpp>

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可以显著的简化代码。