MatchContours1vsN

Compare a reference contour with multiple other contours using the Hu moment invariants (and optionally further aspects). Returns a sorted list of best matches.

Syntax

Definition:

HRESULT MatchContours1vsN(
    HRESULT                            hrPrev,
    ITcVnContainer*                    ipRefContour,
    ITcVnContainer*                    ipContours,
    ITcVnContainer*&                   ipMatchIndexes,
    ITcVnContainer*&                   ipDissimilarities,
    double                             fDissimilarityThreshold,
    ETcVnContoursMatchComparisonMethod eComparisonMethod,
    double                             fAreaFactor = 0,
    double                             fAbsPositionFactor = 0
)

Parameters

Name	Type	Default	Description
hrPrev	HRESULT		HRESULT indicating the result of previous operations (If SUCCEEDED(hrPrev) equals false, no operation is executed.)
ipRefContour	ITcVnContainer*		Reference contour (ContainerType_Vector_TcVnPoint2_DINT or ContainerType_Vector_TcVnPoint2_REAL; The elements of this container are the points of the contour)
ipContours	ITcVnContainer*		Collection of multiple contours (CTcVnContainer_Vector_Vector_TcVnPoint2_DINT)
ipMatchIndexes	ITcVnContainer*&		Returns the indexes of the best matches (CTcVnContainer_Vector_ULINT; sorted, first element is best match, i.e. has lowest dissimilarity)
ipDissimilarities	ITcVnContainer*&		Returns the computed dissimilarities of the best matches (CTcVnContainer_Vector_LREAL; Optional, set to 0 if not required; sorted corresponding to ipMatchIndexes)
fDissimilarityThreshold	double		Neglect irrelevant matches, i.e. dissimilarity > fDissimilarityThreshold
eComparisonMethod	ETcVnContoursMatchComparisonMethod		Method used for comparing the Hu moment invariants of the contours
fAreaFactor	double	0	If > 0, the relative area difference between contours is scaled by this factor and added to the computed dissimilarity
fAbsPositionFactor	double	0	If > 0, the absolute position difference between contours (i.e. the coordinates of the geometric contour centers) is scaled by this factor and added to the computed dissimilarity

Return value

HRESULT

Required License

TC3 Vision Matching

System Requirements

Development environment	Target platform	PLC libraries to include
TwinCAT V3.1. 4024.44 or later	PC or CX (x64) with PL50, e.g. Intel 4-core Atom CPU	Tc3_Vision