PCTSignaturesSQFD

Objective-C

@interface PCTSignaturesSQFD : Algorithm

Swift

class PCTSignaturesSQFD : Algorithm

Class implementing Signature Quadratic Form Distance (SQFD).

See

Christian Beecks, Merih Seran Uysal, Thomas Seidl. Signature quadratic form distance. In Proceedings of the ACM International Conference on Image and Video Retrieval, pages 438-445. ACM, 2010. CITE: BeecksUS10

Member of Xfeatures2d

Methods

  • Creates the algorithm instance using selected distance function, similarity function and similarity function parameter.

    Declaration

    Objective-C

    + (nonnull PCTSignaturesSQFD *)create:(int)distanceFunction
                   similarityFunction:(int)similarityFunction
                  similarityParameter:(float)similarityParameter;

    Swift

    class func create(distanceFunction: Int32, similarityFunction: Int32, similarityParameter: Float) -> PCTSignaturesSQFD

    Parameters

    distanceFunction

    Distance function selector. Default: L2 Available: L0_25, L0_5, L1, L2, L2SQUARED, L5, L_INFINITY
    similarityFunction

    Similarity function selector. Default: HEURISTIC Available: MINUS, GAUSSIAN, HEURISTIC
    similarityParameter

    Parameter of the similarity function.

  • Creates the algorithm instance using selected distance function, similarity function and similarity function parameter.

    Declaration

    Objective-C

    + (nonnull PCTSignaturesSQFD *)create:(int)distanceFunction
                   similarityFunction:(int)similarityFunction;

    Swift

    class func create(distanceFunction: Int32, similarityFunction: Int32) -> PCTSignaturesSQFD

    Parameters

    distanceFunction

    Distance function selector. Default: L2 Available: L0_25, L0_5, L1, L2, L2SQUARED, L5, L_INFINITY
    similarityFunction

    Similarity function selector. Default: HEURISTIC Available: MINUS, GAUSSIAN, HEURISTIC

  • Creates the algorithm instance using selected distance function, similarity function and similarity function parameter.

    Declaration

    Objective-C

    + (nonnull PCTSignaturesSQFD *)create:(int)distanceFunction;

    Swift

    class func create(distanceFunction: Int32) -> PCTSignaturesSQFD

    Parameters

    distanceFunction

    Distance function selector. Default: L2 Available: L0_25, L0_5, L1, L2, L2SQUARED, L5, L_INFINITY Available: MINUS, GAUSSIAN, HEURISTIC

  • Creates the algorithm instance using selected distance function, similarity function and similarity function parameter. Available: L0_25, L0_5, L1, L2, L2SQUARED, L5, L_INFINITY Available: MINUS, GAUSSIAN, HEURISTIC

    Declaration

    Objective-C

    + (nonnull PCTSignaturesSQFD *)create;

    Swift

    class func create() -> PCTSignaturesSQFD

  • Computes Signature Quadratic Form Distance of two signatures.

    Declaration

    Objective-C

    - (float)computeQuadraticFormDistance:(nonnull Mat *)_signature0
                          _signature1:(nonnull Mat *)_signature1;

    Swift

    func computeQuadraticFormDistance(_signature0: Mat, _signature1: Mat) -> Float

    Parameters

    _signature0

    The first signature.
    _signature1

    The second signature.

  • Computes Signature Quadratic Form Distance between the reference signature and each of the other image signatures.

    Declaration

    Objective-C

    - (void)computeQuadraticFormDistances:(nonnull Mat *)sourceSignature
                      imageSignatures:(nonnull NSArray<Mat *> *)imageSignatures
                            distances:(nonnull FloatVector *)distances;

    Swift

    func computeQuadraticFormDistances(sourceSignature: Mat, imageSignatures: [Mat], distances: FloatVector)

    Parameters

    sourceSignature

    The signature to measure distance of other signatures from.
    imageSignatures

    Vector of signatures to measure distance from the source signature.
    distances

    Output vector of measured distances.