C# Class OpenCvSharp.Feature2D

Abstract base class for 2D image feature detectors and descriptor extractors

Inheritance: Algorithm

Private Properties

Property	Type	Description
Feature2D	System
FromPtr	Feature2D

Method	Description
Compute ( IEnumerable images, KeyPoint &keypoints, IEnumerable descriptors ) : void	Compute the descriptors for a keypoints collection detected in image collection.
Compute ( InputArray image, KeyPoint inKeypoints, KeyPoint &outKeypoints, OutputArray descriptors ) : void	Compute the descriptors for a set of keypoints in an image.
Compute ( InputArray image, KeyPoint &keypoints, OutputArray descriptors ) : void	Compute the descriptors for a set of keypoints in an image.
Detect ( InputArray image, OpenCvSharp.Mat mask = null ) : KeyPoint[]	Detect keypoints in an image.
Detect ( OpenCvSharp.Mat image, OpenCvSharp.Mat mask = null ) : KeyPoint[]	Detect keypoints in an image.
Detect ( IEnumerable images, IEnumerable masks = null ) : KeyPoint[][]	Detect keypoints in an image set.
DetectAndCompute ( InputArray image, InputArray mask, KeyPoint &keypoints, OutputArray descriptors, bool useProvidedKeypoints = false ) : void	Detects keypoints and computes the descriptors
Empty ( ) : bool	Return true if detector object is empty

Method	Description
Dispose ( bool disposing ) : void	Releases the resources

Method	Description
Feature2D ( ) : System
FromPtr ( IntPtr ptr ) : Feature2D	Creates instance from cv::Ptr<T> . ptr is disposed when the wrapper disposes.

Compute the descriptors for a keypoints collection detected in image collection.

public Compute ( IEnumerable images, KeyPoint &keypoints, IEnumerable descriptors ) : void
images	IEnumerable	Image collection.
keypoints	KeyPoint	Input keypoints collection. keypoints[i] is keypoints detected in images[i]. /// Keypoints for which a descriptor cannot be computed are removed.
descriptors	IEnumerable	Descriptor collection. descriptors[i] are descriptors computed for set keypoints[i].
return	void

Compute the descriptors for a set of keypoints in an image.

public Compute ( InputArray image, KeyPoint inKeypoints, KeyPoint &outKeypoints, OutputArray descriptors ) : void
image	InputArray	The image.
inKeypoints	KeyPoint	The input keypoints. Keypoints for which a descriptor cannot be computed are removed.
outKeypoints	KeyPoint
descriptors	OutputArray	Copmputed descriptors. Row i is the descriptor for keypoint i.
return	void

Compute the descriptors for a set of keypoints in an image.

public Compute ( InputArray image, KeyPoint &keypoints, OutputArray descriptors ) : void
image	InputArray	The image.
keypoints	KeyPoint	The input keypoints. Keypoints for which a descriptor cannot be computed are removed.
descriptors	OutputArray	Copmputed descriptors. Row i is the descriptor for keypoint i.
return	void

Detect keypoints in an image.

public Detect ( InputArray image, OpenCvSharp.Mat mask = null ) : KeyPoint[]
image	InputArray	The image.
mask	OpenCvSharp.Mat	Mask specifying where to look for keypoints (optional). /// Must be a char matrix with non-zero values in the region of interest.
return	KeyPoint[]

Detect keypoints in an image.

public Detect ( OpenCvSharp.Mat image, OpenCvSharp.Mat mask = null ) : KeyPoint[]
image	OpenCvSharp.Mat	The image.
mask	OpenCvSharp.Mat	Mask specifying where to look for keypoints (optional). /// Must be a char matrix with non-zero values in the region of interest.
return	KeyPoint[]

Detect keypoints in an image set.

public Detect ( IEnumerable images, IEnumerable masks = null ) : KeyPoint[][]
images	IEnumerable	Image collection.
masks	IEnumerable	Masks for image set. masks[i] is a mask for images[i].
return	KeyPoint[][]

Detects keypoints and computes the descriptors

public DetectAndCompute ( InputArray image, InputArray mask, KeyPoint &keypoints, OutputArray descriptors, bool useProvidedKeypoints = false ) : void
image	InputArray
mask	InputArray
keypoints	KeyPoint
descriptors	OutputArray
useProvidedKeypoints	bool
return	void

Releases the resources

protected Dispose ( bool disposing ) : void
disposing	bool	/// If disposing equals true, the method has been called directly or indirectly by a user's code. Managed and unmanaged resources can be disposed. /// If false, the method has been called by the runtime from inside the finalizer and you should not reference other objects. Only unmanaged resources can be disposed. ///
return	void

Return true if detector object is empty

public Empty ( ) : bool
return	bool