F_VN_Homography

Find the homography (perspective transformation) between two planar point sets using RANSAC algorithm.

Syntax

Definition:

FUNCTION F_VN_Homography : HRESULT
VAR_INPUT
    ipSrcPoints           : ITcVnContainer;
    ipDestPoints          : ITcVnContainer;
END_VAR
VAR_IN_OUT
    aPerspectiveTransform : TcVnMatrix3x3_LREAL;
END_VAR
VAR_INPUT
    hrPrev                : HRESULT;
END_VAR

Inputs

Name	Type	Description
ipSrcPoints	ITcVnContainer	Container with at least 4 source points (ContainerType_Vector_TcVnPoint2_REAL)
ipDestPoints	ITcVnContainer	Container with destination points (same number as ipSrcPoints, ContainerType_Vector_TcVnPoint2_REAL)
hrPrev	HRESULT	HRESULT indicating the result of previous operations (If SUCCEEDED(hrPrev) equals false, no operation is executed.)

In/Outputs

Name	Type	Description
aPerspectiveTransform	TcVnMatrix3x3_LREAL	Returns the perspective transformation matrix, which transforms the source points to the destination points

Return value

HRESULT

Required License

TC3 Vision Base

System Requirements

Development environment	Target platform	PLC libraries to include
TwinCAT V3.1.4024.54 or later	PC or CX (x64) with PL50, e.g. Intel 4-core Atom CPU	Tc3_Vision