ORB Class

Class implementing the ORB (*oriented BRIEF*) keypoint detector and descriptor extractor. described in @cite RRKB11 . The algorithm uses FAST in pyramids to detect stable keypoints, selects the strongest features using FAST or Harris response, finds their orientation using first-order moments and computes the descriptors using BRIEF (where the coordinates of random point pairs (or k-tuples) are rotated according to the measured orientation).

Inheritance Hierarchy

SystemObject
  OpenCvSharpDisposableObject
    OpenCvSharpDisposableCvObject
      OpenCvSharpAlgorithm
        OpenCvSharpFeature2D
          OpenCvSharpORB

Namespace: OpenCvSharp
Assembly: OpenCvSharp (in OpenCvSharp.dll) Version: 1.0.0

Syntax

C++

Copy

public class ORB : Feature2D

Public Class ORB
	Inherits Feature2D

public ref class ORB : public Feature2D

type ORB =  
    class
        inherit Feature2D
    end

The ORB type exposes the following members.

Constructors

	Name	Description
	ORB	Initializes a new instance of the ORB class

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Properties

	Name	Description
	AllocatedMemory	Gets or sets a memory address allocated by AllocMemory. (Inherited from DisposableObject.)
	AllocatedMemorySize	Gets or sets the byte length of the allocated memory (Inherited from DisposableObject.)
	CvPtr	Native pointer of OpenCV structure (Inherited from DisposableCvObject.)
	DataHandle	Gets or sets a handle which allocates using cvSetData. (Inherited from DisposableObject.)
	DefaultNorm	(Inherited from Feature2D.)
	DescriptorSize	(Inherited from Feature2D.)
	DescriptorType	(Inherited from Feature2D.)
	EdgeThreshold
	Empty	Returns true if the Algorithm is empty (e.g. in the very beginning or after unsuccessful read (Inherited from Algorithm.)
	FastThreshold
	FirstLevel
	IsDisposed	Gets a value indicating whether this instance has been disposed. (Inherited from DisposableObject.)
	IsEnabledDispose	Gets or sets a value indicating whether you permit disposing this instance. (Inherited from DisposableObject.)
	MaxFeatures
	NLevels
	PatchSize
	ScaleFactor
	ScoreType
	WTA_K

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Methods

	Name	Description
	AllocGCHandle	Pins the object to be allocated by cvSetData. (Inherited from DisposableObject.)
	AllocMemory	Allocates the specified size of memory. (Inherited from DisposableObject.)
	Compute(InputArray, KeyPoint, OutputArray)	Compute the descriptors for a set of keypoints in an image. (Inherited from Feature2D.)
	Compute(IEnumerableMat, KeyPoint, IEnumerableMat)	Compute the descriptors for a keypoints collection detected in image collection. (Inherited from Feature2D.)
	Create	The ORB constructor
	Detect(InputArray, Mat)	Detect keypoints in an image. (Inherited from Feature2D.)
	Detect(Mat, Mat)	Detect keypoints in an image. (Inherited from Feature2D.)
	Detect(IEnumerableMat, IEnumerableMat)	Detect keypoints in an image set. (Inherited from Feature2D.)
	DetectAndCompute	Detects keypoints and computes the descriptors (Inherited from Feature2D.)
	Dispose	Releases the resources (Inherited from DisposableObject.)
	Dispose(Boolean)	Releases the resources (Inherited from DisposableObject.)
	DisposeManaged	Releases managed resources (Overrides DisposableObjectDisposeManaged.)
	DisposeUnmanaged	releases unmanaged resources (Inherited from DisposableCvObject.)
	Empty	Return true if detector object is empty (Inherited from Feature2D.)
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Finalize	Destructor (Inherited from DisposableObject.)
	GetDefaultName	(Inherited from Feature2D.)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	NotifyMemoryPressure	Notifies the allocated size of memory. (Inherited from DisposableObject.)
	Read(String)	(Inherited from Feature2D.)
	Read(FileNode)	Reads algorithm parameters from a file storage (Inherited from Algorithm.)
	Save	Saves the algorithm to a file. In order to make this method work, the derived class must implement Algorithm::write(FileStorage fs). (Inherited from Algorithm.)
	ThrowIfDisposed	If this object is disposed, then ObjectDisposedException is thrown. (Inherited from DisposableObject.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)
	Write(String)	(Inherited from Feature2D.)
	Write(FileStorage)	Stores algorithm parameters in a file storage (Inherited from Algorithm.)

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Fields

	Name	Description
	ptr	Data pointer (Inherited from DisposableCvObject.)

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Reference

OpenCvSharp Namespace