Class Freak

Namespace: Emgu.CV.XFeatures2D

Assembly: Emgu.CV.dll

The FREAK (Fast Retina Keypoint) keypoint descriptor: Alahi, R. Ortiz, and P. Vandergheynst. FREAK: Fast Retina Keypoint. In IEEE Conference on Computer Vision and Pattern Recognition, 2012. CVPR 2012 Open Source Award Winner. The algorithm propose a novel keypoint descriptor inspired by the human visual system and more precisely the retina, coined Fast Retina Key- point (FREAK). A cascade of binary strings is computed by efficiently comparing image intensities over a retinal sampling pattern. FREAKs are in general faster to compute with lower memory load and also more robust than SIFT, SURF or BRISK. They are competitive alternatives to existing keypoints in particular for embedded applications.

public class Freak : Feature2D, IDisposable, IAlgorithm

Inheritance: object

DisposableObject

UnmanagedObject

SharedPtrObject

Feature2D

Freak

Implements: IDisposable

IAlgorithm

Inherited Members: Feature2D._feature2D

Feature2D.DetectAndCompute(IInputArray, IInputArray, VectorOfKeyPoint, IOutputArray, bool)

Feature2D.DetectRaw(IInputArray, VectorOfKeyPoint, IInputArray)

Feature2D.Detect(IInputArray, IInputArray)

Feature2D.Compute(IInputArray, VectorOfKeyPoint, IOutputArray)

Feature2D.Feature2DPtr

Feature2D.DescriptorSize

SharedPtrObject._sharedPtr

SharedPtrObject.SharedPtr

UnmanagedObject._ptr

UnmanagedObject.Ptr

DisposableObject.Dispose()

DisposableObject.ReleaseManagedResources()

object.GetType()

object.MemberwiseClone()

object.ToString()

object.Equals(object)

object.Equals(object, object)

object.ReferenceEquals(object, object)

object.GetHashCode()

Extension Methods: AlgorithmExtensions.Clear(IAlgorithm)

AlgorithmExtensions.GetDefaultName(IAlgorithm)

AlgorithmExtensions.IsEmpty(IAlgorithm)

AlgorithmExtensions.Load(IAlgorithm, string, string, string)

AlgorithmExtensions.LoadFromString(IAlgorithm, string, string, string)

AlgorithmExtensions.Read(IAlgorithm, FileNode)

AlgorithmExtensions.Save(IAlgorithm, string)

AlgorithmExtensions.SaveToString(IAlgorithm, string)

AlgorithmExtensions.Write(IAlgorithm, FileStorage, string)

AlgorithmExtensions.Write(IAlgorithm, FileStorage)

Constructors

Freak(bool, bool, float, int)

Create a Freak descriptor extractor.

public Freak(bool orientationNormalized = true, bool scaleNormalized = true, float patternScale = 22, int nOctaves = 4)

Parameters

orientationNormalized bool: Enable orientation normalization
scaleNormalized bool: Enable scale normalization
patternScale float: Scaling of the description pattern
nOctaves int: Number of octaves covered by the detected keypoints.

Methods

DisposeObject()

Release all the unmanaged resource associated with FREAK