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Open Source Computer Vision Library opencv.org
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Liutong HAN 3fbaad36d7
Merge pull request #26624 from hanliutong:rvv-mean 
Add RISC-V HAL implementation for meanStdDev #26624

`meanStdDev` benefits from the Universal Intrinsic backend of RVV, but we also found that the performance on the `8UC4` type is worse than the scalar version when there is a mask, and there is no optimization implementation on `32FC1`.

This patch implements `meanStdDev` function in RVV_HAL using native intrinsic, significantly optimizing the performance for `8UC1`, `8UC4` and `32FC1`.

This patch is tested on BPI-F3 for both gcc 14.2 and clang 19.1.
```
$ opencv_test_core --gtest_filter="*MeanStdDev*"
$ opencv_perf_core --gtest_filter="Size_MatType_meanStdDev*
```

![1734077611879](https://github.com/user-attachments/assets/71c85c9d-1db1-470d-81d1-bf546e27ad86)

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [ ] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake
2024-12-18 22:19:02 +03:00
.github Revert "CI: enable AVX2 build" (#26610) 2024-12-10 17:23:13 +03:00
3rdparty Merge pull request #26624 from hanliutong:rvv-mean 2024-12-18 22:19:02 +03:00
apps Merge pull request #26524 from MurtazaSaherwala:DocumentationUpdation 2024-12-09 16:23:07 +03:00
cmake Merge pull request #25691 from redhecker:gifSupport 2024-12-07 10:17:41 +03:00
data Merge pull request #22727 from su77ungr:patch-1 2022-11-17 06:54:25 +00:00
doc doc: upgraded for compatibility with doxygen 1.12 2024-12-09 23:08:18 +03:00
include exclude opencv_contrib modules 2020-02-26 15:12:45 +03:00
modules js: fix helper.js to not trigger warnings 2024-12-18 11:49:08 +01:00
platforms fix build_js warnings 2024-11-24 04:24:44 +03:00
samples Merge pull request #26614 from KangJialiang:fix-multi-channel-mean-scale-sample-dnn-yolo 2024-12-16 15:29:43 +03:00
.editorconfig add .editorconfig 2018-10-11 17:57:51 +00:00
.gitattributes cmake: generate and install ffmpeg-download.ps1 2018-06-09 13:19:48 +03:00
.gitignore Merge pull request #17165 from komakai:objc-binding 2020-06-08 18:32:53 +00:00
CMakeLists.txt Merge pull request #25691 from redhecker:gifSupport 2024-12-07 10:17:41 +03:00
CONTRIBUTING.md migration: github.com/opencv/opencv 2016-07-12 12:51:12 +03:00
COPYRIGHT copyright: 2023 (update) 2023-01-09 09:49:22 +00:00
LICENSE Merge pull request #18073 from vpisarev:apache2_license 2020-08-17 11:49:11 +00:00
README.md Space mistake in README.md 2024-03-03 23:37:07 +05:30
SECURITY.md Updated PGP key for security reports 2023-04-19 19:16:55 +03:00

README.md

OpenCV: Open Source Computer Vision Library

Resources

Contributing

Please read the contribution guidelines before starting work on a pull request.

Summary of the guidelines:

  • One pull request per issue;
  • Choose the right base branch;
  • Include tests and documentation;
  • Clean up "oops" commits before submitting;
  • Follow the coding style guide.

Additional Resources