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# Changelog
This file documents significant changes between KleidiCV releases.
KleidiCV uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
This changelog aims to follow the guiding principles of
[Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
- Implementation of cv::pyrDown in the OpenCV HAL.
- Implementation of cv::buildOpticalFlowPyramid in the OpenCV HAL.
- Sum implementation for 1-channel f32 input (not exposed to OpenCV).
### Changed
- Build options `KLEIDICV_ENABLE_SVE2` and `KLEIDICV_ENABLE_SME2` take effect directly.
Previously the build scripts had additional checks that attempted to identify whether the compiler supported SVE2/SME2 - these checks have been removed.
- The default setting for `KLEIDICV_ENABLE_SVE2` is on for some popular compilers known to support SVE2, otherwise off.
- `KLEIDICV_ENABLE_SME2` defaults to off. This is because the ACLE SME specification has not yet been finalized.
- In the OpenCV HAL, cvtColor for gray-RGBA & BGRA-RGBA are multithreaded.
- Improved performance of 8-bit int to 32-bit float conversion.
- Renamed functions:
- kleidicv_float_conversion_f32_s8 to kleidicv_f32_to_s8
- kleidicv_float_conversion_f32_u8 to kleidicv_f32_to_u8
- kleidicv_float_conversion_s8_f32 to kleidicv_s8_to_f32
- kleidicv_float_conversion_u8_f32 to kleidicv_u8_to_f32
- Exponential function for float.
- Gaussian Blur for 7x7 kernels.
- Gaussian Blur for 15x15 kernels.
- Separable Filter 2D for 5x5 kernels (not exposed to OpenCV).
- Enable specifying standard deviation for Gaussian blur.
- Add, subtract, multiply & absdiff enabled in OpenCV HAL.
- MinMax enabled in OpenCV HAL, float version added.
- Resize 4x4 for float.
- Resize 0.5x0.5 for uint8_t.
- Conversion from float to (u)int8_t and vice versa.
- KLEIDICV_LIMIT_SME2_TO_SELECTED_ALGORITHMS configuration option.
- Conversion from non-subsampled, interleaved YUV to RGB/BGR.
- InRange single channel, scalar bounds for uint8_t and float.
- Filter context creation API specification.
- Gaussian Blur API specification.
- In the OpenCV HAL, the following operations are multithreaded:
* cvtColor
* convertTo
* exp
* minMaxIdx
- threshold from OpenCV HAL.