CODEWITHSUNDEEP
opencvpython-3.5
rhonda.rooster
rhonda.rooster

Reputation: 875

sift = cv2.xfeatures2d.SIFT_create() not working even though have contrib installed

So I am trying to use:

sift = cv2.xfeatures2d.SIFT_create()

and it is coming up with this error:

cv2.error: OpenCV(3.4.3) C:\projects\opencv-python\opencv_contrib\modules\xfeatures2d\src\sift.cpp:1207: error: (-213:The function/feature is not implemented) 
This algorithm is patented and is excluded in this configuration; Set OPENCV_ENABLE_NONFREE CMake 
option and rebuild the library in function 'cv::xfeatures2d::SIFT::create'

I am using Python 3.5.0 and opencv(3.4.3) and I am just using idle. This occured after I tried to install TensorFlow and I have tried looking around and have installed opencv-contrib-python but I am still getting the same error. Thank you in advance and I apologise if I have not included enough info

Upvotes: 76

Views: 137280

Answers (7)

Abhirami V S
Abhirami V S

Reputation: 363

Since SIFT patent expired, SIFT has been moved to the main repo.

To use SIFT in Opencv, You should use

cv2.SIFT_create()

instead of

cv2.xfeatures2d.SIFT_create()

xfeatures2d only exists in the contrib package, but sift is part of the main package now.

This link will be helpful.

Upvotes: 23

gal peled
gal peled

Reputation: 41

I use OpenCV version 4.7 and this works for me:

cv2.SIFT_create()

the xfeatures2d.SIFT_create() method was removed because of some patent issues and is available in the short form as above.

Upvotes: 1

Mohamed Gamal
Mohamed Gamal

Reputation: 91

I've been into this problem for many hours and finally I've solved it, and I'll share with you (and for any body else) how to solve it.

Here are the steps:

1- Download CMAKE from the official website.

2- Download Visual Studio

3- Download OpenCV Sources.zip files.

4- Download OpenCV-contrib from github.

  • First, we'll create a directory and name it 'OpenCV', this directory will contain the 'opencv-x.x.x' and 'opencv_contrib-x.x.x' downloaded extracted files.

  • We'll also create a 'build' directory that will contain the new OpenCV build files.

enter image description here

  • The next step is to run the CMake (cmake-gui) app. enter image description here
  • You should then
    1. locate the 'opencv-x.x.x' extracted folder in the directory we created 'OpenCV'.
    2. do the same for the 'build' folder.

enter image description here

  • After doing that, click on 'Configure'

enter image description here

  • A popup window should appear, choose the suitable configurations enter image description here

  • Wait for the progress bar to finish.

  • Check the OPENCV_ENABLE_NONFREE, then click 'Configure' again and wait for the progress bar.

enter image description here

  • After it is done loading, click 'Generate', right next to 'Configure' button.

  • Congrats, you've done the first steps!

  • Okay, close the CMAKE (cmake-gui) app and go to the 'build' directory we created.

  • locate 'OpenCV.sln' and run it using Visual Studio.

  • Change vs build mode from 'Debug' to 'Release'.

  • On the right 'Solution Explorer' menu, locate 'CMakeTargets' >> 'ALL_BUILD', right click it and select 'Build'

  • Wait for it to build (it may take 5+ minutes)

  • Again, on the right 'Solution Explorer' menu, locate 'CMakeTargets' >> 'INSTALL', right click it and select 'Build'

enter image description here

enter image description here

  • After it finishes loading, you can then use it, that's all!

Extra:

  • You can freely uninstall any pre-installations of 'opencv-python' and 'opencv-contrib-python' via the the pip
    pip uninstall opencv-python
    pip uninstall opencv-contrib-python

  • Reboot your device.

  • Test OpenCV. Open a terminal and type

    $ python
    >>> import cv2
    >>> cv2.__version__

Hope this helps, thank you!

Upvotes: 2

Ben
Ben

Reputation: 61

You can try if python version is latest.

pip install opencv-contrib-python==4.4.0.46

Upvotes: 0

J.Zhao
J.Zhao

Reputation: 2330

I had the same problem. It seems that SIRF and SURF are no longer available in opencv > 3.4.2.16. I chose an older opencv-python and opencv-contrib-python versions and solved this problem. Here is the history version about opencv-python, and I use the following code :

pip install opencv-python==3.4.2.16
pip install opencv-contrib-python==3.4.2.16

Edit

For Anaconda User just this instead of pip

conda install -c menpo opencv

this will install cv2 3.4.1 and everything you need to run SIFT

Upvotes: 156

I.R.
I.R.

Reputation: 502

Edit: The opencv-contrib-python-nonfree was removed from pypi.

On Linux/ MacOS, I've found a better solution! To access nonfree detectors use: pip install opencv-contrib-python-nonfree

Upvotes: 13

Ben
Ben

Reputation: 71

It may be due to a mismatch of opencv version and opencv-contrib version. If you installed opencv from the source using CMake, and the source version is different from the version of opencv-contrib-python, uninstall the current opencv-contrib-python and do pip install opencv-contrib-python==<version of the source>.X or an another compatible version. One version setup that I have running is opencv source (3.2), opencv-python (3.4.0.14) and opencv-contrib-python (3.4.2.17)

Upvotes: 7

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