opencv | Open Source Computer Vision Library | Computer Vision library
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- opencv has a medium active ecosystem.
- It has 60896 star(s) with 50971 fork(s). There are 2643 watchers for this library.
- There were 1 major release(s) in the last 6 months.
- There are 2010 open issues and 6782 have been closed. On average issues are closed in 208 days. There are 113 open pull requests and 0 closed requests.
- It has a neutral sentiment in the developer community.
- The latest version of opencv is 4.5.5
Quality
- opencv has 0 bugs and 0 code smells.
Security
- opencv has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
- opencv code analysis shows 0 unresolved vulnerabilities.
- There are 0 security hotspots that need review.
License
- opencv has a Non-SPDX License.
- Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.
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- opencv releases are available to install and integrate.
- It has 792998 lines of code, 4581 functions and 801 files.
- It has high code complexity. Code complexity directly impacts maintainability of the code.
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opencv Key Features
Open Source Computer Vision Library
opencv Examples and Code Snippets
OpenCV numpy to cv::Mat conversion
PyMODINIT_FUNC PyInit_cv2();
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QUESTION
OpenCV numpy to cv::Mat conversion
Asked 2022-Apr-05 at 12:36I inherited an application with opencv, shiboken and pyside and my first task was to update to qt6, pyside6 and opencv 4.5.5. This has gone well so far, I can import the module and make class instances etc. However I have a crash when passing numpy arrays:
I am passing images in the form of numpy arrays through python to opencv and I am using pyopencv_to to convert from the array to cv::Mat. This worked in a previous version of opencv (4.5.3), but with 4.5.5 it seems to be broken.
When I try to pass an array through pyopencv_to, I get the exception opencv_ARRAY_API was nullptr. My predecessor solved this by directly calling PyInit_cv2(), which was apparently previously included via a header. But I cannot find any header in the git under the tag 4.5.3 that defines this function. Is this a file that is generated? I can see there is a pycompat.hpp, but that does not include the function either.
Is there a canonical way to initialize everything so that numpy arrays can be passed properly? Or a tutorial anyone can point me to? My searches have so far not produced any useful hints.
Thanks a lot in advance! :)
ANSWER
Answered 2022-Apr-05 at 12:36I finally found a solution. I dont know if this is the correct way of doing it, but it works.
I made a header file that contains
PyMODINIT_FUNC PyInit_cv2();
as a forward declaration and then copied over everything in the modules/python/src2 directory. I assumed this was already happening in the cv2.cpp file, because there is already exactly that line (in cv2.cpp).
But just adding that include works perfectly fine, apparently. Now I can call the init function when my own module is initialized and it seems to properly set all the needed state.
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