Add OpenCV 5 features wrappers: ALIKED, DISK, LightGlue, ANNIndex, AffineFeature - #1926
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…dex, AffineFeature Wraps the new and previously-unwrapped classes from the OpenCV 5 features module (formerly features2d): - ALIKED, DISK: deep-learning local feature detectors/descriptors (Feature2D, ONNX via dnn). Both expose Create (file path) and CreateFromMemory (buffer). - LightGlueMatcher: attention-based descriptor matcher (DescriptorMatcher) with SetPairInfo/ClearPairInfo. - ANNIndex: Annoy-based approximate nearest neighbor index (modern FLANN alternative) with add/build/knnSearch/save/load and ANNIndexDistance enum. - AffineFeature: affine-invariant wrapper over a backend Feature2D (ASIFT). DNN-dependent classes are guarded with HAVE_OPENCV_DNN in the native bridge. Model-path string entry points use the Windows/NotWindows marshaling split. Tests: AffineFeature and ANNIndex are exercised end-to-end; DISK/ALIKED/ LightGlue verify entry-point wiring (missing model -> OpenCVException) since their ONNX models are not committed. Full Features suite green (51 passed). Refs #1924. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This was referenced Jun 25, 2026
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Summary
Implements the remaining features (formerly features2d) module classes from #1924 (OpenCV 5 API coverage).
New wrappers
ALIKED/DISK— deep-learning local feature detectors & descriptors (Feature2D, ONNX via the dnn module). Each exposesCreate(model file path) andCreateFromMemory(in-memory buffer). DISK additionally exposesMaxKeypoints/ScoreThreshold/ImageSize.LightGlueMatcher— attention-based descriptor matcher (DescriptorMatcher) withSetPairInfo/ClearPairInfo.ANNIndex— Annoy-based approximate nearest neighbor index (modern FLANN alternative):AddItems/Build/KnnSearch/Save/Load/GetTreeNumber/GetItemNumber/SetOnDiskBuild/SetSeed, plus theANNIndexDistanceenum.AffineFeature— affine-invariant (ASIFT-style) wrapper over a backendFeature2D, withSetViewParams/GetViewParams.Native bridge
#ifdef HAVE_OPENCV_DNN.ANNIndexlives in a newfeatures_ANNIndex.h(it is neitherFeature2DnorDescriptorMatcher); the others are added to the existing grouped headers.Test
AffineFeatureTestandANNIndexTestexercise the classes end-to-end (detect over SIFT backend; add/build/knnSearch round-trip + save/load).DiskAlikedLightGlueTestverifies entry-point wiring (missing model / garbage buffer →OpenCVException), since the ONNX models are not committed to the repo.OpenCvSharpExternlocally; full Features suite green (51 passed).Refs #1924.
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