F_VN_GetPerspectiveTransformation

Calculate the perspective transformation between four corresponding point pairs. The points mark the corners of the corresponding rectangles.

Syntax

Definition:

FUNCTION F_VN_GetPerspectiveTransformation : HRESULT
VAR_IN_OUT
    aSrcPoints            : TcVnArray4_Point2_REAL;
    aDestPoints           : TcVnArray4_Point2_REAL;
    aTransformationMatrix : TcVnMatrix3x3_LREAL;
END_VAR
VAR_INPUT
    hrPrev                : HRESULT;
END_VAR

Inputs

Name	Type	Description
hrPrev	HRESULT	HRESULT indicating the result of previous operations (If SUCCEEDED(hrPrev) equals false, no operation is executed.)

In/Outputs

Name	Type	Description
aSrcPoints	TcVnArray4_Point2_REAL	Source points
aDestPoints	TcVnArray4_Point2_REAL	Destination points
aTransformationMatrix	TcVnMatrix3x3_LREAL	Resulting transformation matrix

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