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python: cv.Mat wrapper over numpy.ndarray

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Alexander Alekhin
2021-08-15 20:33:06 +00:00
parent 3c89a28a06
commit 0c10ae1861
5 changed files with 244 additions and 17 deletions
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doc/py_tutorials/py_bindings/py_bindings_basics/py_bindings_basics.markdown
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@@ -60,6 +60,14 @@ of C++.
So this is the basic version of how OpenCV-Python bindings are generated.
@note There is no 1:1 mapping of numpy.ndarray on cv::Mat. For example, cv::Mat has channels field,
which is emulated as last dimension of numpy.ndarray and implicitly converted.
However, such implicit conversion has problem with passing of 3D numpy arrays into C++ code
(the last dimension is implicitly reinterpreted as number of channels).
Refer to the [issue](https://github.com/opencv/opencv/issues/19091) for workarounds if you need to process 3D arrays or ND-arrays with channels.
OpenCV 4.5.4+ has `cv.Mat` wrapper derived from `numpy.ndarray` to explicitly handle the channels behavior.
How to extend new modules to Python?
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