F_VN_HoughLinesExp
Search for lines using the standard Hough transform. (expert function)
Syntax
Definition:
FUNCTION F_VN_HoughLinesExp : HRESULT
VAR_INPUT
ipSrcImage : ITcVnImage;
ipLines : Reference To ITcVnContainer;
fDistRes : LREAL;
fAngleRes : LREAL;
nAccuThreshold : UDINT;
fDistResDiv : LREAL;
fAngleResDiv : LREAL;
hrPrev : HRESULT;
END_VAR
Inputs
|
Name |
Type |
Description |
|---|---|---|
|
ipSrcImage |
Source image (USINT, 1 channel, binary, may be modified by the function) | |
|
ipLines |
Reference To ITcVnContainer |
Returns a container which is filled with the found lines (ContainerType_Vector_TcVnVector2_REAL; Each container element contains the distance from the origin [0] in pixels and the rotation angle [1] in radians, respectively. Non-zero interface pointers are reused.) |
|
fDistRes |
LREAL |
Distance resolution of the accumulator (in pixels, must be > 0) |
|
fAngleRes |
LREAL |
Angle resolution of the accumulator (in radians, must be > 0) |
|
nAccuThreshold |
UDINT |
Accumulator threshold |
|
fDistResDiv |
LREAL |
Divisor of the distance resolution for the multi-scale Hough transform (>= 0, must be > 0 if fAngleResDiv is > 0) |
|
fAngleResDiv |
LREAL |
Divisor of the angle resolution for the multi-scale Hough transform (>= 0, must be > 0 if fDistResDiv is > 0) |
|
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 |