F_VN_Homography

F_VN_Homography 1:

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

F_VN_Homography 2: 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.)

F_VN_Homography 3: In/Outputs

Name

Type

Description

aPerspectiveTransform

TcVnMatrix3x3_LREAL

Returns the perspective transformation matrix, which transforms the source points to the destination points

F_VN_Homography 4: 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