F_VN_ImagePointsWorldDistance

Computes the distance in the world coordinate system between two points (in the same world coordinate z layer) given in image coordinates.

Syntax

Definition:

FUNCTION F_VN_ImagePointsWorldDistance : HRESULT
VAR_IN_OUT
    aImagePoint1            : TcVnPoint2_REAL;
    aImagePoint2            : TcVnPoint2_REAL;
    fWorldDistance          : LREAL;
    aCameraMatrix           : TcVnMatrix3x3_LREAL;
    aDistortionCoefficients : TcVnArray8_LREAL;
    aRotationMatrix         : TcVnMatrix3x3_LREAL;
    aTranslationVector      : TcVnVector3_LREAL;
END_VAR
VAR_INPUT
    fZ                      : LREAL;
    hrPrev                  : HRESULT;
END_VAR

Inputs

Name	Type	Description
fZ	LREAL	z coordinate (world coordinate system) of the given points (0 would be at (toplevel) calibration pattern)
hrPrev	HRESULT	HRESULT indicating the result of previous operations (If SUCCEEDED(hrPrev) equals false, no operation is executed.)

In/Outputs

Name	Type	Description
aImagePoint1	TcVnPoint2_REAL	First point in the image coordinate system
aImagePoint2	TcVnPoint2_REAL	Second point in the image coordinate system
fWorldDistance	LREAL	Returns the distance between aImagePoint1 and aImagePoint2 in the world coordinate system
aCameraMatrix	TcVnMatrix3x3_LREAL	3x3 camera matrix containing the intrinsic parameters
aDistortionCoefficients	TcVnArray8_LREAL	Lens distortion coefficients [k1, k2, p1, p2, k3, k4, k5, k6]
aRotationMatrix	TcVnMatrix3x3_LREAL	3x3 rotation matrix
aTranslationVector	TcVnVector3_LREAL	Translation vector

Return value

HRESULT

Required License

TC3 Vision Metrology 2D

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