F_VN_FourierDescriptors

F_VN_FourierDescriptors 1:

Computes the fourier descriptors for a closed contour.

Syntax

Definition:

FUNCTION F_VN_FourierDescriptors : HRESULT
VAR_INPUT
    ipContour     : ITcVnContainer;
    ipDescriptors : Reference To ITcVnContainer;
    nDescriptors  : DINT;
    hrPrev        : HRESULT;
END_VAR

F_VN_FourierDescriptors 2: Inputs

Name

Type

Description

ipContour

ITcVnContainer

Closed contour (ContainerType_Vector_TcVnPoint2_DINT or ContainerType_Vector_TcVnPoint2_REAL or ContainerType_Vector_TcVnPoint2_LREAL. Providing the full contour is strongly recommended, i.e. use TCVN_CAM_NONE for contour detection algorithms.)

ipDescriptors

Reference To ITcVnContainer

Returns the fourier descriptors for ipContour (Re0, Im0, Re1, Im1, ...; ContainerType_Vector_LREAL if ipContour is of type ContainerType_Vector_TcVnPoint2_LREAL, else ContainerType_Vector_REAL.)

nDescriptors

DINT

Specifies how many descriptors should be returned (set to -1 to return all computed descriptors, i.e. at least as many as the number of contour points)

hrPrev

HRESULT

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

F_VN_FourierDescriptors 3: 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