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Merge pull request #27430 from CodeLinaro:dsp_markdown

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Document Qualcomm's FastCV DSP based OpenCV Extension APIs and usage instructions #27430

This PR updates the documentation by:

- Adding a new section: Qualcomm's FastCV DSP based OpenCV Extension APIs list, detailing the OpenCV APIs under the cv::fastcv::dsp namespace and their corresponding Qualcomm's FastCV DSP accelerated implementations.

- Providing a step-by-step guide on how to use the Qualcomm's FastCV DSP APIs.

- Update resizeDown and warpAffine mappings

### 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
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Aakash Preetam 2025-06-11 11:53:34 +05:30 committed by GitHub
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doc/tutorials/introduction/building_fastcv/building_fastcv.markdown
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@ -175,6 +175,8 @@ HAL and Extension list of APIs
**FastCV based OpenCV Extensions APIs list :**
These OpenCV extension APIs are implemented under the **cv::fastcv** namespace.
|OpenCV Extension APIs |Underlying FastCV API for OpenCV acceleration |
|----------------------|----------------------------------------------|
|matmuls8s32 |fcvMatrixMultiplys8s32 |
@ -199,8 +201,10 @@ HAL and Extension list of APIs
|remap |fcvRemapu8_v2 |
|remapRGBA |fcvRemapRGBA8888BLu8 |
| |fcvRemapRGBA8888NNu8 |
|resizeDownBy2 |fcvScaleDownBy2u8_v2 |
|resizeDownBy4 |fcvScaleDownBy4u8_v2 |
|resizeDown |fcvScaleDownBy2u8_v2 |
| |fcvScaleDownBy4u8_v2 |
| |fcvScaleDownMNInterleaveu8 |
| |fcvScaleDownMNu8 |
|meanShift |fcvMeanShiftu8 |
| |fcvMeanShifts32 |
| |fcvMeanShiftf32 |
@ -263,3 +267,52 @@ HAL and Extension list of APIs
| |fcvChannelCombine4Planesu8 |
|split |fcvDeinterleaveu8 |
| |fcvChannelExtractu8 |
|warpAffine |fcvTransformAffineu8_v2 |
| |fcvTransformAffineClippedu8_v3 |
| |fcv3ChannelTransformAffineClippedBCu8 |
**FastCV QDSP based OpenCV Extension APIs list :**
These OpenCV extension APIs are implemented under the **cv::fastcv::dsp** namespace.
This namespace provides optimized implementations that leverage QDSP (**Qualcomm's Digital Signal Processor**) acceleration using FastCV's Q-suffixed APIs. These functions require DSP initialization (fcvQ6Init).
|OpenCV Extension APIs |Underlying FastCV API for OpenCV acceleration |
|----------------------|----------------------------------------------|
|filter2D |fcvFilterCorr3x3s8_v2Q |
| |fcvFilterCorrNxNu8Q |
| |fcvFilterCorrNxNu8s16Q |
| |fcvFilterCorrNxNu8f32Q |
|FFT |fcvFFTu8Q |
|IFFT |fcvIFFTf32Q |
|fcvdspinit |fcvQ6Init |
|fcvdspdeinit |fcvQ6DeInit |
|Canny |fcvFilterCannyu8Q |
|sumOfAbsoluteDiffs |fcvSumOfAbsoluteDiffs8x8u8_v2Q |
|thresholdOtsu |fcvFilterThresholdOtsuu8Q |
**How to Use FastCV QDSP based OpenCV Extension APIs**
This section outlines the essential steps required to use OpenCV Extension APIs that are accelerated using FastCV on QDSP(**Qualcomm's Digital Signal Processor**).
1. Initialize QDSP:
- Call **cv::fastcv::dsp::fcvdspinit()** to initialize the QDSP.
2. Allocate memory using **Qualcomm's memory allocator** for all buffers that are being fed to the OpenCV extension API.:
- Use **cv::fastcv::getQcAllocator()** to assign the allocator to the buffers.
- Example:
cv::Mat src;
src.allocator = cv::fastcv::getQcAllocator(); **// Set Qualcomm's memory allocator**
\
After setting Qualcomm's memory allocator, any buffer created using methods like src.create(...), cv::imread(...) etc., will have its memory allocated using Qualcomm's memory allocator.
3. Call the OpenCV extension API from 'cv::fastcv::dsp':
- Example: **cv::fastcv::dsp::thresholdOtsu(src, dst, binaryType);**
where 'src' and 'dst' are 'cv::Mat' objects with the Qualcomm's memory allocator,
     and 'binaryType' is a boolean indicating the thresholding mode.
4. Deinitialize QDSP:
- Call **cv::fastcv::dsp::fcvdspdeinit()** to deinitialize the QDSP.
**Reference Example**:
Refer to a working test case using the OpenCV Extension APIs in the opencv_contrib repository:[opencv_contrib/modules/fastcv/test/test_thresh_dsp.cpp](https://github.com/opencv/opencv_contrib/blob/4.x/modules/fastcv/test/test_thresh_dsp.cpp)