AKAZE

Objective-C

@interface AKAZE : Feature2D

Swift

class AKAZE : Feature2D

Class implementing the AKAZE keypoint detector and descriptor extractor, described in CITE: ANB13.

AKAZE descriptors can only be used with KAZE or AKAZE keypoints. This class is thread-safe.

Note

When you need descriptors use Feature2D::detectAndCompute, which provides better performance. When using Feature2D::detect followed by Feature2D::compute scale space pyramid is computed twice.

Note

AKAZE implements T-API. When image is passed as UMat some parts of the algorithm will use OpenCL.

Note

[ANB13] Fast Explicit Diffusion for Accelerated Features in Nonlinear Scale Spaces. Pablo F. Alcantarilla, Jesús Nuevo and Adrien Bartoli. In British Machine Vision Conference (BMVC), Bristol, UK, September 2013.

Member of Features2d

Methods

  • Declaration

    Objective-C

    - (DescriptorType)getDescriptorType NS_SWIFT_NAME(getDescriptorType());

    Swift

    func getDescriptorType() -> DescriptorType

  • Declaration

    Objective-C

    - (DiffusivityType)getDiffusivity NS_SWIFT_NAME(getDiffusivity());

    Swift

    func getDiffusivity() -> DiffusivityType

  • The AKAZE constructor

    Declaration

    Objective-C

    + (nonnull AKAZE *)create:(DescriptorType)descriptor_type
          descriptor_size:(int)descriptor_size
      descriptor_channels:(int)descriptor_channels
                threshold:(float)threshold
                 nOctaves:(int)nOctaves
            nOctaveLayers:(int)nOctaveLayers
              diffusivity:(DiffusivityType)diffusivity;

    Swift

    class func create(descriptor_type: DescriptorType, descriptor_size: Int32, descriptor_channels: Int32, threshold: Float, nOctaves: Int32, nOctaveLayers: Int32, diffusivity: DiffusivityType) -> AKAZE

    Parameters

    descriptor_type

    Type of the extracted descriptor: DESCRIPTOR_KAZE, DESCRIPTOR_KAZE_UPRIGHT, DESCRIPTOR_MLDB or DESCRIPTOR_MLDB_UPRIGHT.
    descriptor_size

    Size of the descriptor in bits. 0 -> Full size
    descriptor_channels

    Number of channels in the descriptor (1, 2, 3)
    threshold

    Detector response threshold to accept point
    nOctaves

    Maximum octave evolution of the image
    nOctaveLayers

    Default number of sublevels per scale level
    diffusivity

    Diffusivity type. DIFF_PM_G1, DIFF_PM_G2, DIFF_WEICKERT or DIFF_CHARBONNIER

  • The AKAZE constructor

    Declaration

    Objective-C

    + (nonnull AKAZE *)create:(DescriptorType)descriptor_type
          descriptor_size:(int)descriptor_size
      descriptor_channels:(int)descriptor_channels
                threshold:(float)threshold
                 nOctaves:(int)nOctaves
            nOctaveLayers:(int)nOctaveLayers;

    Swift

    class func create(descriptor_type: DescriptorType, descriptor_size: Int32, descriptor_channels: Int32, threshold: Float, nOctaves: Int32, nOctaveLayers: Int32) -> AKAZE

    Parameters

    descriptor_type

    Type of the extracted descriptor: DESCRIPTOR_KAZE, DESCRIPTOR_KAZE_UPRIGHT, DESCRIPTOR_MLDB or DESCRIPTOR_MLDB_UPRIGHT.
    descriptor_size

    Size of the descriptor in bits. 0 -> Full size
    descriptor_channels

    Number of channels in the descriptor (1, 2, 3)
    threshold

    Detector response threshold to accept point
    nOctaves

    Maximum octave evolution of the image
    nOctaveLayers

    Default number of sublevels per scale level DIFF_CHARBONNIER

  • The AKAZE constructor

    Declaration

    Objective-C

    + (nonnull AKAZE *)create:(DescriptorType)descriptor_type
          descriptor_size:(int)descriptor_size
      descriptor_channels:(int)descriptor_channels
                threshold:(float)threshold
                 nOctaves:(int)nOctaves;

    Swift

    class func create(descriptor_type: DescriptorType, descriptor_size: Int32, descriptor_channels: Int32, threshold: Float, nOctaves: Int32) -> AKAZE

    Parameters

    descriptor_type

    Type of the extracted descriptor: DESCRIPTOR_KAZE, DESCRIPTOR_KAZE_UPRIGHT, DESCRIPTOR_MLDB or DESCRIPTOR_MLDB_UPRIGHT.
    descriptor_size

    Size of the descriptor in bits. 0 -> Full size
    descriptor_channels

    Number of channels in the descriptor (1, 2, 3)
    threshold

    Detector response threshold to accept point
    nOctaves

    Maximum octave evolution of the image DIFF_CHARBONNIER

  • The AKAZE constructor

    Declaration

    Objective-C

    + (nonnull AKAZE *)create:(DescriptorType)descriptor_type
          descriptor_size:(int)descriptor_size
      descriptor_channels:(int)descriptor_channels
                threshold:(float)threshold;

    Swift

    class func create(descriptor_type: DescriptorType, descriptor_size: Int32, descriptor_channels: Int32, threshold: Float) -> AKAZE

    Parameters

    descriptor_type

    Type of the extracted descriptor: DESCRIPTOR_KAZE, DESCRIPTOR_KAZE_UPRIGHT, DESCRIPTOR_MLDB or DESCRIPTOR_MLDB_UPRIGHT.
    descriptor_size

    Size of the descriptor in bits. 0 -> Full size
    descriptor_channels

    Number of channels in the descriptor (1, 2, 3)
    threshold

    Detector response threshold to accept point DIFF_CHARBONNIER

  • The AKAZE constructor

    Declaration

    Objective-C

    + (nonnull AKAZE *)create:(DescriptorType)descriptor_type
          descriptor_size:(int)descriptor_size
      descriptor_channels:(int)descriptor_channels;

    Swift

    class func create(descriptor_type: DescriptorType, descriptor_size: Int32, descriptor_channels: Int32) -> AKAZE

    Parameters

    descriptor_type

    Type of the extracted descriptor: DESCRIPTOR_KAZE, DESCRIPTOR_KAZE_UPRIGHT, DESCRIPTOR_MLDB or DESCRIPTOR_MLDB_UPRIGHT.
    descriptor_size

    Size of the descriptor in bits. 0 -> Full size
    descriptor_channels

    Number of channels in the descriptor (1, 2, 3) DIFF_CHARBONNIER

  • The AKAZE constructor

    Declaration

    Objective-C

    + (nonnull AKAZE *)create:(DescriptorType)descriptor_type
          descriptor_size:(int)descriptor_size;

    Swift

    class func create(descriptor_type: DescriptorType, descriptor_size: Int32) -> AKAZE

    Parameters

    descriptor_type

    Type of the extracted descriptor: DESCRIPTOR_KAZE, DESCRIPTOR_KAZE_UPRIGHT, DESCRIPTOR_MLDB or DESCRIPTOR_MLDB_UPRIGHT.
    descriptor_size

    Size of the descriptor in bits. 0 -> Full size DIFF_CHARBONNIER

  • The AKAZE constructor

    Declaration

    Objective-C

    + (nonnull AKAZE *)create:(DescriptorType)descriptor_type;

    Swift

    class func create(descriptor_type: DescriptorType) -> AKAZE

    Parameters

    descriptor_type

    Type of the extracted descriptor: DESCRIPTOR_KAZE, DESCRIPTOR_KAZE_UPRIGHT, DESCRIPTOR_MLDB or DESCRIPTOR_MLDB_UPRIGHT. DIFF_CHARBONNIER

  • The AKAZE constructor

     DESCRIPTOR_KAZE_UPRIGHT, DESCRIPTOR_MLDB or DESCRIPTOR_MLDB_UPRIGHT.
 DIFF_CHARBONNIER

    Declaration

    Objective-C

    + (nonnull AKAZE *)create;

    Swift

    class func create() -> AKAZE

  • Declaration

    Objective-C

    - (nonnull NSString *)getDefaultName;

    Swift

    func getDefaultName() -> String

  • Declaration

    Objective-C

    - (double)getThreshold NS_SWIFT_NAME(getThreshold());

    Swift

    func getThreshold() -> Double

  • Declaration

    Objective-C

    - (int)getDescriptorChannels NS_SWIFT_NAME(getDescriptorChannels());

    Swift

    func getDescriptorChannels() -> Int32

  • Declaration

    Objective-C

    - (int)getDescriptorSize NS_SWIFT_NAME(getDescriptorSize());

    Swift

    func getDescriptorSize() -> Int32

  • Declaration

    Objective-C

    - (int)getNOctaveLayers NS_SWIFT_NAME(getNOctaveLayers());

    Swift

    func getNOctaveLayers() -> Int32

  • Declaration

    Objective-C

    - (int)getNOctaves NS_SWIFT_NAME(getNOctaves());

    Swift

    func getNOctaves() -> Int32

  • Declaration

    Objective-C

    - (void)setDescriptorChannels:(int)dch NS_SWIFT_NAME(setDescriptorChannels(dch:));

    Swift

    func setDescriptorChannels(dch: Int32)

  • Declaration

    Objective-C

    - (void)setDescriptorSize:(int)dsize NS_SWIFT_NAME(setDescriptorSize(dsize:));

    Swift

    func setDescriptorSize(dsize: Int32)

  • Declaration

    Objective-C

    - (void)setDescriptorType:(DescriptorType)dtype NS_SWIFT_NAME(setDescriptorType(dtype:));

    Swift

    func setDescriptorType(dtype: DescriptorType)

  • Declaration

    Objective-C

    - (void)setDiffusivity:(DiffusivityType)diff NS_SWIFT_NAME(setDiffusivity(diff:));

    Swift

    func setDiffusivity(diff: DiffusivityType)

  • Declaration

    Objective-C

    - (void)setNOctaveLayers:(int)octaveLayers NS_SWIFT_NAME(setNOctaveLayers(octaveLayers:));

    Swift

    func setNOctaveLayers(octaveLayers: Int32)

  • Declaration

    Objective-C

    - (void)setNOctaves:(int)octaves NS_SWIFT_NAME(setNOctaves(octaves:));

    Swift

    func setNOctaves(octaves: Int32)

  • Declaration

    Objective-C

    - (void)setThreshold:(double)threshold NS_SWIFT_NAME(setThreshold(threshold:));

    Swift

    func setThreshold(threshold: Double)