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satyam yadav 2b42788803 Merge pull request #28217 from satyam102006:feature/dis-coarsest-scale

[video] Add setCoarsestScale to DISOpticalFlow (Fixes #25068) #28217

### Description
This PR addresses issue #25068 regarding the number of scales in `DISOpticalFlow`.

Currently, `DISOpticalFlow` automatically computes the `coarsest_scale` based on the image size. While generally effective, this behavior can cause errors in specific use cases (e.g., mechanics/speckle pattern analysis) where high pyramid levels degrade quality.

This change introduces a manual override:
- Added `setCoarsestScale(int val)` and `getCoarsestScale()` to the public API.
- Updated `DISOpticalFlowImpl::calc` and `ocl_calc` to use the user-defined scale if set.
- Preserved the existing "automatic" behavior as the default (when set to -1).

### Changes
- **`modules/video/include/opencv2/video/tracking.hpp`**: Added virtual method declarations.
- **`modules/video/src/dis_flow.cpp`**: Implemented `set/getCoarsestScale` in `DISOpticalFlowImpl` and updated calculation logic.
- **`modules/video/test/test_OF_accuracy.cpp`**: Added `DenseOpticalFlow_DIS.ManualCoarsestScale` regression test.


Fixes #25068

2025-12-20 13:28:32 +03:00

ocl

Merge pull request #23109 from seanm:misc-warnings

2023-10-06 13:33:21 +03:00

test_accum.cpp

ts: refactor OpenCV tests

2018-02-03 19:39:47 +00:00

test_bgfg2.cpp

Merge pull request #27810 from D00E:known-foreground-mask

2025-10-14 09:56:06 +03:00

test_camshift.cpp

Backport C-API cleanup (imgproc) from 5.x