Documentation>C API
Data Structures
Here are the data structures with brief descriptions:

C_VlCovDet | Covariant feature detector
C VlAIB | AIB algorithm data
C VlArray | Numeric array
C VlCovDetFeature | A detected feature shape and location
C VlCovDetFeatureLaplacianScale | A detected feature Laplacian scale
C VlCovDetFeatureOrientation | A detected feature orientation
C VlDsiftDescriptorGeometry | Dense SIFT descriptor geometry
C VlDsiftFilter | Dense SIFT filter
C VlDsiftKeypoint | Dense SIFT keypoint
C VlEnumerator | Member of an enumeration
C VlFileMeta | Support for command line drivers - Definition
C VlFrameDisc | Disc feature frame
C VlFrameEllipse | Ellipse feature frame
C VlFrameOrientedDisc | Oriented disc feature frame An upright frame has `angle` equal to zero
C VlFrameOrientedEllipse | Oriented ellipse feature frame The affine transformation transforms the ellipse shape into a circular region
C VlHIKMNode | HIKM tree node
C VlHIKMTree | HIKM tree
C VlIKMFilt | IKM quantizer
C VlKDForest | KDForest object
C VlKDForestNeighbor | Neighbor of a query point
C VlKDForestSearcher | VlKDForest searcher object
C VlKMeans | K-means quantizer
C VlLbp | Local Binary Pattern extractor
C VlLiopDesc | LIOP descriptor extractor object
C VlMserExtrReg | MSER: extremal region (declaration)
C VlMserFilt | MSER filter
C VlMserReg | MSER: basic region (declaration)
C VlMserStats | MSER filter statistics definition
C vlmxOption | MEX option
C VlPgmImage | PGM image meta data
C VlQS | Quick shift results
C VlRand | Random numbber generator state
C VlScaleSpace | Scale space class
C VlScaleSpaceGeometry | Geometry of a scale space
C VlScaleSpaceOctaveGeometry | Geometry of one octave of a scale space
C VlSiftFilt | SIFT filter
C VlSiftKeypoint | SIFT filter keypoint
C VlSvmStatistics | SVM statistics This structure contains statistics characterising the state of the SVM solver, such as the current value of the objective function