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cv2)?Ī: It's easier for users to understand opencv-python than cv2 and it makes it easier to find the package with search engines. Q: Why the package and import are different (opencv-python vs. Q: Why the packages do not include non-free algorithms?Ī: Non-free algorithms such as SIFT and SURF are not included in these packages because they are patented and therefore cannot be distributed as built binaries. #LINUX CONDA INSTALL OPENCV MANUAL#If you still encounter the error after you have checked all the previous solutions, download Dependencies and open the cv2.pyd (located usually at C:\Users\username\AppData\Local\Programs\Python\PythonXX\Lib\site-packages\cv2) file with it to debug missing DLL issues.Ī: Make sure you have removed old manual installations of OpenCV Python bindings (cv2.so or cv2.pyd in site-packages). Old Anaconda versions have a bug which causes the error, see this issue for a manual fix. If the above does not help, check if you are using Anaconda. #LINUX CONDA INSTALL OPENCV WINDOWS#If you are using Windows N or KN edition, please install also Windows Media Feature Pack. Windows N and KN editions do not include Media Feature Pack which is required by OpenCV. #LINUX CONDA INSTALL OPENCV WINDOWS 10#If you are using older Windows version than Windows 10 and latest system updates are not installed, Universal C Runtime might be also required. ![]() Q: Import fails on Windows: ImportError: DLL load failed: The specified module could not be found.?Ī: If the import fails on Windows, make sure you have Visual C redistributable 2015 installed. However, opencv-python packages for Raspberry Pi can be found from. Note that the wheel (especially manylinux) format does not currently support properly ARM architecture so there are no packages for ARM based platforms in PyPI. ?Ī: Most likely the issue is related to too old pip and can be fixed by running pip install -upgrade pip. Q: Pip fails with Could not find a version that satisfies the requirement. Q: Do I need to install also OpenCV separately?Ī: No, the packages are special wheel binary packages and they already contain statically built OpenCV binaries. For example:Ĭv2.CascadeClassifier( "haarcascade_frontalface_default.xml")īefore opening a new issue, read the FAQ below and have a look at the other issues which are already open. can be used as a shortcut to the data folder. run pip install opencv-contrib-python-headless if you need both main and contrib modules (check extra modules listing from OpenCV documentation)Īll packages contain haarcascade files.run pip install opencv-python-headless if you need only main modules.They are smaller and suitable for more restricted environments. These packages do not contain any GUI functionality. Packages for server (headless) environments run pip install opencv-contrib-python if you need both main and contrib modules (check extra modules listing from OpenCV documentation)ī.run pip install opencv-python if you need only main modules.Packages for standard desktop environments (Windows, macOS, almost any GNU/Linux distribution) If you installed multiple different packages in the same environment, uninstall them all with pip uninstall and reinstall only one package.Ī. There is no plugin architecture: all the packages use the same namespace ( cv2). Do not install multiple different packages in the same environment. There are four different packages and you should select only one of them. ![]() Select the correct package for your environment: cv2 module in the root of Python's site-packages), remove it before installation to avoid conflicts. If you have previous/other manually installed (= not installed via pip) version of OpenCV installed (e.g. Unofficial pre-built OpenCV packages for Python. ![]()
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