FREAK

Objective-C

@interface FREAK : Feature2D

Swift

class FREAK : Feature2D

Class implementing the FREAK (Fast Retina Keypoint) keypoint descriptor, described in CITE: AOV12 .

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.

@note - An example on how to use the FREAK descriptor can be found at opencv_source_code/samples/cpp/freak_demo.cpp

Member of Xfeatures2d

Methods


                    
                    
                    +create:scaleNormalized:patternScale:nOctaves:selectedPairs:

Declaration

Objective-C

+ (nonnull FREAK *)create:(BOOL)orientationNormalized
          scaleNormalized:(BOOL)scaleNormalized
             patternScale:(float)patternScale
                 nOctaves:(int)nOctaves
            selectedPairs:(nonnull IntVector *)selectedPairs;

Swift

class func create(orientationNormalized: Bool, scaleNormalized: Bool, patternScale: Float, nOctaves: Int32, selectedPairs: IntVector) -> FREAK

Parameters

`orientationNormalized`	Enable orientation normalization.
`scaleNormalized`	Enable scale normalization.
`patternScale`	Scaling of the description pattern.
`nOctaves`	Number of octaves covered by the detected keypoints.
`selectedPairs`	(Optional) user defined selected pairs indexes,


                    
                    
                    +create:scaleNormalized:patternScale:nOctaves:

Declaration

Objective-C

+ (nonnull FREAK *)create:(BOOL)orientationNormalized
          scaleNormalized:(BOOL)scaleNormalized
             patternScale:(float)patternScale
                 nOctaves:(int)nOctaves;

Swift

class func create(orientationNormalized: Bool, scaleNormalized: Bool, patternScale: Float, nOctaves: Int32) -> FREAK

Parameters

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


                    
                    
                    +create:scaleNormalized:patternScale:

Declaration

Objective-C

+ (nonnull FREAK *)create:(BOOL)orientationNormalized
          scaleNormalized:(BOOL)scaleNormalized
             patternScale:(float)patternScale;

Swift

class func create(orientationNormalized: Bool, scaleNormalized: Bool, patternScale: Float) -> FREAK

Parameters

`orientationNormalized`	Enable orientation normalization.
`scaleNormalized`	Enable scale normalization.
`patternScale`	Scaling of the description pattern.


                    
                    
                    +create:scaleNormalized:

Declaration

Objective-C

+ (nonnull FREAK *)create:(BOOL)orientationNormalized
          scaleNormalized:(BOOL)scaleNormalized;

Swift

class func create(orientationNormalized: Bool, scaleNormalized: Bool) -> FREAK

Parameters

`orientationNormalized`	Enable orientation normalization.
`scaleNormalized`	Enable scale normalization.


                    
                    
                    +create:

Declaration

Objective-C

+ (nonnull FREAK *)create:(BOOL)orientationNormalized;

Swift

class func create(orientationNormalized: Bool) -> FREAK

Parameters


                                orientationNormalized

Enable orientation normalization.


                    
                    
                    +create

Declaration

Objective-C

+ (nonnull FREAK *)create;

Swift

class func create() -> FREAK