F_VN_HoughCircles
Search for circles using the Hough transform.
Can use available TwinCAT Job Tasks for executing parallel code regions.
Can return partial results when canceled by Watchdog.
Syntax
Definition:
FUNCTION F_VN_HoughCircles : HRESULT
VAR_INPUT
ipSrcImage : ITcVnImage;
ipCircles : Reference To ITcVnContainer;
fInvAccuRatio : LREAL;
fMinDist : LREAL;
hrPrev : HRESULT;
END_VAR
Inputs
|
Name |
Type |
Description |
|---|---|---|
|
ipSrcImage |
Source image (USINT, 1 channel, gray-level) | |
|
ipCircles |
Reference To ITcVnContainer |
Returns a container which is filled with the found circles (ContainerType_Vector_TcVnVector3_REAL; Each container element contains the x coordinate of the circle center [0], the y coordinate of the circle center [1], and the radius [2], respectively. Non-zero interface pointers are reused.) |
|
fInvAccuRatio |
LREAL |
Inverted ratio of the accumulator size in relation to the source image's size (must be > 0. A value of 2 means that the size is halved in both directions.) |
|
fMinDist |
LREAL |
Smallest allowed distance of two circles (must be > 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 V3.1.4024.54 or later | PC or CX (x64) with PL50, e.g. Intel 4-core Atom CPU | Tc3_Vision |