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Editorial Team
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Asked: 2026-05-23T14:21:02+00:00

I am using VS 2008 with OpenCV 2.1 installed as per the installation guide.

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I am using VS 2008 with OpenCV 2.1 installed as per the installation guide. FeatureDetector/SurfFeatureDetector are listed as classes in the documentation, but they are considered “syntax error : identifier ‘SurfFeatureDetector”

This is pretty much the entirety of my code.

#include "cv.h"
#include "highgui.h"

Ptr<FeatureDetector> *detect = new SurfFeatureDetector();

I’ve tried a bunch of random combinations to get this to work. How can I initialize a featuredetector?

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1 Answer

  1. Editorial Team

    I think you have installation problem, try resinstalling from here: sourceforge.net/projects/opencvlibrary/files/opencv-win/2.2

    anther other option is that your precompiler already has __OPENCV_OLD_CV_H__ defined.
    Try undefining it before #include "cv.h"

    When you type #include "cv.h"
    It automatically should include featurs2d. in fact cv.h includes the following:

    #include "opencv2/core/core_c.h"
#include "opencv2/core/core.hpp"
#include "opencv2/imgproc/imgproc_c.h"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/video/tracking.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/flann/flann.hpp"
#include "opencv2/calib3d/calib3d.hpp"
#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/legacy/compat.hpp"
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