[Cv] opencv header file

What you need to call to the function opencv, it is referenced in the code head in advance corresponding header files.
All header files are in the include/opencv2/folder to find the file.

Common header file:

#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"

Specific action:

• core: it can be seen by name is the core module, defines the basic data structures and arithmetic functions;
• imgproc: The module consists of linear and nonlinear image filtering, image geometric transformations, color space conversion, histogram processing and the like;
• video: The module comprises a motion estimation, background separation, object tracking;
• highgui: Interface video capture, encoding and decoding of image and video, the graphical interface;
• calib3d: substantially multi-view geometry algorithm, the individual stereo camera calibration, the object pose estimation, stereo reconstruction algorithm similarity, 3D information;
• features2d: remarkable feature detection, description, feature matching;
• objdetect: object detection and classification of pre-defined instances (such as the face, eyes, face, people, vehicles, etc.);
• ml: machine learning module (SVM, decision trees, Boosting, etc.) ;;
• GPU: OpenCV module using the GPU acceleration algorithm;
• contrib: achieve a variety of target tracking algorithms, including featuretracker, hybridtracker and detection_based_tracker etc;

Among them, the most frequently cited header file:

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

Since opencv.hppalready contains OpenCV header file of each module, you may only reference the header files:

#include <opencv2/opencv.hpp>

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references

[. 1] the OpenCV overview
[2] the OpenCV Learning (3) OpenCV frame