F_VN_FourierDescriptors
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
Inputs
|
Name |
Type |
Description |
|---|---|---|
|
ipContour |
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 indicating the result of previous operations (If SUCCEEDED(hrPrev) equals false, no operation is executed.) |
Return valueRequired License
TC3 Vision Base
System Requirements
Development environment | Target platform | PLC libraries to include |
|---|---|---|
TwinCAT V3.1. 4024.44 or later | PC or CX (x64) with PL50, e.g. Intel 4-core Atom CPU | Tc3_Vision |