Can t use SURF SIFT in OpenCV

Question

I m trying a simple thing like  detector   cv2 SIFT     and get this bad error  detector   cv2 SIFT   AttributeError   module  object has no attribute  SIFT    I do not understand that because cv2 is installed   cv2   version   is   Rev  4557     My system is Ubuntu 12 04   Maybe someone has got the same problem and could help me   EDIT   Long story short  testypypypy py   import cv2  detector   cv2 SIFT     ERROR   Traceback  most recent call last     File  testypypy py   line 3  in  lt module gt      detector   cv2 SIFT   AttributeError   module  object has no attribute  SIFT   If I take SURF it works because SURF is in dir cv2  but if I also take cv2 BFMatcher   I get the same error    So it s missing and I have to add it but I don t know how

User · Answer

try this  pip install opencv-contrib-python  4 4 0 44 sift   cv2 SIFT create

User · Answer

just change SHIFT to ORB  I think it make occur because of non-relevant version  ORB is efficient and better alternative of SHIFT or SURF   As I also face same problem when i was used cv2 SHIFT       ERROR  AttributeError   module  object has no attribute  SIFT    Now its completely working for me please try this   ORB   cv2 ORB

User · Answer

for debian users its  easy  to create their own libopencv-nonfree package   i followed the opencv tutorial for python  but in my debian the SIFT and SURF modules were missing  And there is no non-free package available for debian including SIFT and SURF etc   They were stripped from the package due to license issues      i never created a package for debian before  adding a new module etc  but i followed some small steps in the debian tutorials and tried and guessed around a bit  and after 1 day  voila    i got working a libopencv-nonfree2 4 deb package and a python module with correct bindings    i dont know if i also needed to install the newly built python-opencv package or only the nonfree    i re-installed both and got a working python opencv library with all necessary nonfree modules    ok  here it is    this is for libopencv 2 4     you can do all steps except installing as a normal user   we need the built essesntials and some tools from debian repository to compile and create a new package   sudo apt-get install build-essential fakeroot devscripts   create a directory in your home and change to that directory   cd    amp  amp  mkdir opencv-debian cd opencv-debian   download the needed packages   apt-get source libopencv-core2 4   and download all needed dependency packages to build the new opencv  apt-get build-dep libopencv-core2 4   this will download the neeeded sources and create a directory called  opencv-2 4 9 1 dfsg   change to that directory   cd opencv-2 4 9 1 dfsg   now you can test if the package will built without modifications by typing   fakeroot debian rules binary   this will take a long time  this step should finish without errors you now have a lot of  deb packages in your opencv-debian directory  now we make some modifications to the package definition to let debian buld the nonfree modules and package   change to the opencv-debian directory and download the correct opencv source   in my case opencv 2 4 9 or so  i got mine from https   github com Itseez opencv releases  wget https   codeload github com Itseez opencv tar gz 2 4 9   this will download opencv-2 4 9 tar gz  extract the archive   tar -xzvf opencv-2 4 9 tar gz   this will unpack the original source to a directory called opencv-2 4 9  now copy the nonfree modules from original source to the debian source   cp -rv opencv-2 4 9 modules nonfree opencv-2 4 9 1 dfsg modules    ok  now we have the source of the nonfree modules  but thats not enough for debian    we need to modify 1 file and create a new one  we have to edit the debian control file and add a new section at end of file   i use mcedit as an editor here   mcedit opencv-2 4 9 1 dfsg debian control   or use any other editor of your choice  and add this section   Package  libopencv-nonfree2 4 Architecture  any Depends    shlibs Depends     misc Depends  Description  OpenCV Nonfree Modules like SIFT and SURF  This package contains nonfree modules for the OpenCV  Open Computer Vision   library      The Open Computer Vision Library is a collection of algorithms and sample  code for various computer vision problems  The library is compatible with  IPL  Intel s Image Processing Library  and  if available  can use IPP   Intel s Integrated Performance Primitives  for better performance      OpenCV provides low level portable data types and operators  and a set  of high level functionalities for video acquisition  image processing and  analysis  structural analysis  motion analysis and object tracking  object  recognition  camera calibration and 3D reconstruction    now we create a new file called libopencv-nonfree2 4 install  touch opencv-2 4 9 1 dfsg debian libopencv-nonfree2 4 install   and edit   mcedit opencv-2 4 9 1 dfsg debian libopencv-nonfree2 4 install   and add the following content   usr lib   libopencv nonfree so     ok  thats it  now create the packages again   cd opencv-2 4 9 1 dfsg   first a clean up   fakeroot debian rules clean   and build   fakeroot debian rules binary   et voila    after a while you have a fresh built and a new package libopencv-nonfree2 4 deb   now install as root   dpkg -i libopencv-nonfree2 4 deb dpkg -i python-opencv deb   and test   import cv2 import numpy as np from matplotlib import pyplot as plt  img   cv2 imread  test jpg   gray   cv2 cvtColor img cv2 COLOR BGR2GRAY   sift   cv2 SIFT   kp   sift detect gray None  img cv2 drawKeypoints gray kp   corners   cv2 goodFeaturesToTrack gray 16 0 05 10  corners   np int0 corners   for i in corners      x y   i ravel       cv2 circle img  x y  90 255 3   plt imshow img  plt show     have fun

User · Answer

You can proceed in this way  It must work for you as well    Step 1    virtualenv venv  source venv bin activate     Step 2    sudo python3 -m pip install opencv-python  3 4 2 16  sudo python3 -m pip install opencv-contrib-python  3 4 2 16     Step 3    import cv2 sift   cv2 xfeatures2d SIFT create       Don t use cv2 SIFT     It will raise an exception

User · Answer

There is a pip source that makes this very easy    If you have another version of opencv-python installed use this command to remove it to avoid conflicts   pip uninstall opencv-python  Then install the contrib version with this   pip install opencv-contrib-python  SIFT usage   import cv2 sift   cv2 xfeatures2d SIFT create

User · Answer

The following page provides a relatively good guide that requires few corrections   https   cv-tricks com how-to installation-of-opencv-4-1-0-in-windows-10-from-source   On step 8  when you are choosing generator for the project  tool used for building   don t forget to specify x64 in the second field if you need it  If you don t  you will get LNK1112 error  which is a linker error caused if one module is created with the x64 compiler  and another module is created with the x86 compiler    Next  when choosing flags in step 9  don t forget to tick the  OPENCV ENABLE NONFREE   and set the path for flag  OPENCV EXTRA MODULES PATH  flag  The path must be set to  modules  folder in opencv-contrib-python    So you need both opencv  and opencv-contrib-python in order to use SIFT and SURF

User · Answer

Just change the version of opencv to 3 4 2 16  Since it is patented it is not available in newer version

User · Answer

As per June 2020  I suppose this version  pip install -U opencv-contrib-python  3 4 2 16  is still working  so install it and enjoy

User · Answer

As an Anaconda user  I wanted to find one or two appropriate commands to solve the problem  Fortunately  this answer helped  For conda 4 5 11  use conda -V to check Anaconda version  I have performed next steps     Python version does not matter  most likely  check yourself conda create -n myenv python 3 6      conda activate myenv conda install -c menpo opencv   That will install OpenCV 2 4 11  Anaconda s another command conda install -c menpo opencv3 will install OpenCV3  but Python has to be downgraded to 2 7  To install OpenCV3 with Python3 use next  due to the first link    conda create -n myenv python   pip install opencv-python  3 4 2 16 pip install opencv-contrib-python  3 4 2 16   Check the SIFT   conda activate myenv python  gt  gt  gt  cv2 xfeatures2d SIFT create    lt xfeatures2d SIFT 000002A3478655B0 gt

User · Answer

Follow this installation operation  cmake -D CMAKE BUILD TYPE RELEASE -D CMAKE INSTALL PREFIX  usr local     -D WITH TBB ON -D BUILD NEW PYTHON SUPPORT ON -D WITH V4L ON      -D INSTALL C EXAMPLES ON -D INSTALL PYTHON EXAMPLES ON      -D BUILD EXAMPLES ON -D WITH QT ON -D WITH OPENGL ON      using this command will install library to your  usr local lib

User · Answer

The approach suggested by vizzy also works with OpenCV 2 4 8  as when building the non-free package under Ubuntu 14 04 LTS   This dependency issue may prevent installation of the non-free package    libopencv-nonfree2 4 depends on libopencv-ocl2 4  however    Package libopencv-ocl2 4 is not installed    Easily fixable because the missing package can be installed from the ones just built   dpkg -i libopencv-ocl2 4 2 4 8 dfsg1-2ubuntu1 amd64 deb   After that the install proceeds as explained in vizzy s answer

User · Answer

None of the above suggested solutions worked for me  I use Anaconda and found that opencv version 3 3 1 still had Sift enabled   If you want to test in isolated conda environment  try the following inspired from  A Ametov s answer above   conda create -n testenv opencv 3 3 1      conda activate testenv  conda activate myenv python  Check version of opencv being used  gt  gt  gt  import cv2  gt  gt  gt  cv2   version    Check if Sift is available  gt  gt  gt  cv2 xfeatures2d SIFT create    lt xfeatures2d SIFT 000002A3478655B0 gt

User · Answer

I think this is far from the  correct  way to do it  the  correct  way on Ubuntu seems to be to stick to a broken and or outdated OpenCV   but for me building opencv-2 4 6 1 from source brings back cv2 SIFT and cv2 SURF   Steps    Download opencv-2 4 6 1 tar gz from opencv org  Extract the source   tar -xf opencv-2 4 6 1 tar gz -C  tmp  Configure the source  This will tell OpenCV to install into  opencv-2 4 6 1 in your home directory   cmake -D CMAKE BUILD TYPE RELEASE         -D BUILD PYTHON SUPPORT ON         -D WITH XINE ON         -D WITH OPENGL ON         -D WITH TBB ON         -D BUILD EXAMPLES ON         -D BUILD NEW PYTHON SUPPORT ON         -D WITH V4L ON         -D CMAKE INSTALL PREFIX    opencv-2 4 6 1          tmp opencv-2 4 6 1  Build and install   cd  tmp opencv-2 4 6 1 make -j4 make install  Set PYTHONPATH  this works in bash  I have no clue about other shells    export PYTHONPATH    opencv-2 4 6 1 lib python2 7 dist-packages    Now if I start python and import cv2  for me  this produces a gnome-keyring warning   I have cv2 SIFT and cv2 SURF available

User · Answer

Install OpenCV-Contrib import cv2  sift   cv2 xfeatures2d SIFT create   sift something     This is the easy way to install the Contrib

User · Answer

Change this   sift   cv2 xfeatures2d SIFT create     By this   cv2 ORB create

User · Answer

This is what worked for me in September 2020   Remove previous versions  pip uninstall opencv-python pip uninstall opencv-contrib-python   Install this particular version  3 4 2 16 was no longer available  pip install opencv-python  3 4 2 17 pip install opencv-contrib-python  3 4 2 17   Create the detectors with  import cv2 sift   cv2 xfeatures2d SIFT create   surf   cv2 xfeatures2d SURF create

User · Answer

IN opencv3 x SIFT    amp  SURF   are no longer exist  for this  uninstall all the opencv versions  python -m pip uninstall opencv-python  python -m pip uninstall opencv-contrib-python   after that install opencv-contrib to include sift   and surf   using below given command with python 3 x   python -m pip install opencv-contrib-python  3 4 2 16   then you can use   sift   cv2 xfeatures2d SIFT create

User · Answer

FYI  as of 3 0 0 SIFT and friends are in a contrib repo located at https   github com Itseez opencv contrib and are not included with opencv by default

User · Answer

For recent information on this issue  as of Sept 2015  consult this page   Most information on this question here is obsolete   What pyimagesearch is saying is that SURF SIFT  were moved to opencv contrib because of patent issues    For installation there is also a nice page that tells you how to install opencv with opencv contrib and Python support so you get SURF SIFT   Notice that the API also changed  Now it s like this   sift   cv2 xfeatures2d SIFT create     Before I found the above pages  I also suffered quite a bit  But the pages listed do a very good job of helping with installation and explaining what s wrong

User · Answer

Install Python opencv pip install opencv-python  and instead of using     cv2 SIFT    Use  cv2 SIFT create    working code using opencv-python below import cv2 img1   cv2 imread  yourimg png  0  sift   cv2 SIFT create   kp1  des1   sift detectAndCompute img1 None   keypoint and descriptors      you can also install  quot opencv-contrib-python quot  and use  quot cv2 xfeatures2d SIFT create   quot  but that is secondary and up to you   working code using the python package opencv-contrib-python import cv2 img1   cv2 imread  yourimg png  0  sift   cv2 xfeatures2d SIFT create   kp1  des1   sift detectAndCompute img1 None   keypoint and descriptors  Thanks

User · Answer

since I had already compiled opencv when I discovered this problem  all I had to do was  from my opencv build directory    make opencv nonfree sudo make install

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