BoostDesc

Objective-C

@interface BoostDesc : Feature2D

Swift

class BoostDesc : Feature2D

Class implementing BoostDesc (Learning Image Descriptors with Boosting), described in CITE: Trzcinski13a and CITE: Trzcinski13b.

desc type of descriptor to use, BoostDesc::BINBOOST_256 is default (256 bit long dimension) Available types are: BoostDesc::BGM, BoostDesc::BGM_HARD, BoostDesc::BGM_BILINEAR, BoostDesc::LBGM, BoostDesc::BINBOOST_64, BoostDesc::BINBOOST_128, BoostDesc::BINBOOST_256 use_orientation sample patterns using keypoints orientation, enabled by default scale_factor adjust the sampling window of detected keypoints 6.25f is default and fits for KAZE, SURF detected keypoints window ratio 6.75f should be the scale for SIFT detected keypoints window ratio 5.00f should be the scale for AKAZE, MSD, AGAST, FAST, BRISK keypoints window ratio 0.75f should be the scale for ORB keypoints ratio 1.50f was the default in original implementation

Note

BGM is the base descriptor where each binary dimension is computed as the output of a single weak learner. BGM_HARD and BGM_BILINEAR refers to same BGM but use different type of gradient binning. In the BGM_HARD that use ASSIGN_HARD binning type the gradient is assigned to the nearest orientation bin. In the BGM_BILINEAR that use ASSIGN_BILINEAR binning type the gradient is assigned to the two neighbouring bins. In the BGM and all other modes that use ASSIGN_SOFT binning type the gradient is assigned to 8 nearest bins according to the cosine value between the gradient angle and the bin center. LBGM (alias FP-Boost) is the floating point extension where each dimension is computed as a linear combination of the weak learner responses. BINBOOST and subvariants are the binary extensions of LBGM where each bit is computed as a thresholded linear combination of a set of weak learners. BoostDesc header files (boostdesc_*.i) was exported from original binaries with export-boostdesc.py script from samples subfolder.

Member of Xfeatures2d

Methods

  • Declaration

    Objective-C

    + (BoostDesc*)create:(int)desc use_scale_orientation:(BOOL)use_scale_orientation scale_factor:(float)scale_factor NS_SWIFT_NAME(create(desc:use_scale_orientation:scale_factor:));

    Swift

    class func create(desc: Int32, use_scale_orientation: Bool, scale_factor: Float) -> BoostDesc

  • Declaration

    Objective-C

    + (BoostDesc*)create:(int)desc use_scale_orientation:(BOOL)use_scale_orientation NS_SWIFT_NAME(create(desc:use_scale_orientation:));

    Swift

    class func create(desc: Int32, use_scale_orientation: Bool) -> BoostDesc

  • Declaration

    Objective-C

    + (BoostDesc*)create:(int)desc NS_SWIFT_NAME(create(desc:));

    Swift

    class func create(desc: Int32) -> BoostDesc

  • Declaration

    Objective-C

    + (BoostDesc*)create NS_SWIFT_NAME(create());

    Swift

    class func create() -> BoostDesc

  • Declaration

    Objective-C

    - (BOOL)getUseScaleOrientation NS_SWIFT_NAME(getUseScaleOrientation());

    Swift

    func getUseScaleOrientation() -> Bool

  • Declaration

    Objective-C

    - (float)getScaleFactor NS_SWIFT_NAME(getScaleFactor());

    Swift

    func getScaleFactor() -> Float

  • Declaration

    Objective-C

    - (void)setScaleFactor:(float)scale_factor NS_SWIFT_NAME(setScaleFactor(scale_factor:));

    Swift

    func setScaleFactor(scale_factor: Float)

  • Declaration

    Objective-C

    - (void)setUseScaleOrientation:(BOOL)use_scale_orientation NS_SWIFT_NAME(setUseScaleOrientation(use_scale_orientation:));

    Swift

    func setUseScaleOrientation(use_scale_orientation: Bool)