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Merge pull request #28217 from satyam102006:feature/dis-coarsest-scale

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[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
This commit is contained in:
satyam yadav
2025-12-20 15:58:32 +05:30
committed by GitHub
parent 64755d0c3a
commit 2b42788803
3 changed files with 55 additions and 5 deletions
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modules/video/test/test_OF_accuracy.cpp
+26 -1
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@@ -172,4 +172,29 @@ TEST(DenseOpticalFlow_VariationalRefinement, ReferenceAccuracy)
EXPECT_LE(calcRMSE(GT, flow), target_RMSE);
}
}} // namespace
TEST(DenseOpticalFlow_DIS, ManualCoarsestScale)
{
Mat prev = Mat::zeros(Size(320, 240), CV_8UC1);
Mat next = Mat::zeros(Size(320, 240), CV_8UC1);
randu(prev, 0, 255);
randu(next, 0, 255);
Ptr<DISOpticalFlow> dis = DISOpticalFlow::create(DISOpticalFlow::PRESET_FAST);
EXPECT_EQ(dis->getCoarsestScale(), -1);
Mat flow;
dis->calc(prev, next, flow);
EXPECT_FALSE(flow.empty());
int manual_scale = 3;
dis->setCoarsestScale(manual_scale);
EXPECT_EQ(dis->getCoarsestScale(), manual_scale);
dis->calc(prev, next, flow);
EXPECT_FALSE(flow.empty());
dis->setCoarsestScale(-1);
EXPECT_EQ(dis->getCoarsestScale(), -1);
}
}} // namespace