Home/ Questions/Q 4587688
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-21T21:48:58+00:00

Am a beginner to OpenCV and have gone so far as to work out

  • 0

Am a beginner to OpenCV and have gone so far as to work out the hello world samples, inverting, color conversion(RGB->greyscale ) etc programs working.
However i am stuck at the Programs that use cvCanny, cvPyr and other such feature detectors.Would really be thankful if the tiny prblem was sorted out .

I get the Error: error C3861: ‘cvPyrDown’: identifier not found
error C3861: ‘cvCanny’: identifier not found

I’ve included the imgproc and features2d headers yet the problem persists.
What am I missing out ?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Do you have your “Additional input directories” property set correctly?

    Mine, configured by cmake, looks like this:

    C:/OpenCV-2.2.0/release
C:/OpenCV-2.2.0/include
C:/OpenCV-2.2.0/include/opencv
C:/OpenCV-2.2.0/modules/core/include
C:/OpenCV-2.2.0/modules/imgproc/include
C:/OpenCV-2.2.0/modules/features2d/include
C:/OpenCV-2.2.0/modules/gpu/include
C:/OpenCV-2.2.0/modules/calib3d/include
C:/OpenCV-2.2.0/modules/objdetect/include
C:/OpenCV-2.2.0/modules/video/include
C:/OpenCV-2.2.0/modules/highgui/include
C:/OpenCV-2.2.0/modules/ml/include
C:/OpenCV-2.2.0/modules/legacy/include
C:/OpenCV-2.2.0/modules/contrib/include
C:/OpenCV-2.2.0/modules/flann/include

    Btw. CMake is a nice tool if you are dealing with libraries that contains many include files, line OpenCV.

    You can also check two other things:

    1. After compiling OpenCV2.2 from sources, did you built “INSTALL” project in the OpenCV VS solution?

    2. If you are using c++ headers, you might prefer c++ version of those functions,
      in the cv namespace:

      cv::Canny(…)

    • 0