F_VN_HoughLinesPExp

F_VN_HoughLinesPExp 1:

Search for line segments using the probabilistic Hough transform. (expert function)

Syntax

Definition:

FUNCTION F_VN_HoughLinesPExp : HRESULT
VAR_INPUT
    ipSrcImage     : ITcVnImage;
    ipLines        : Reference To ITcVnContainer;
    fDistRes       : LREAL;
    fAngleRes      : LREAL;
    nAccuThreshold : UDINT;
    fMinLineLength : LREAL;
    fMaxLineGap    : LREAL;
    hrPrev         : HRESULT;
END_VAR

F_VN_HoughLinesPExp 2: Inputs

Name

Type

Description

ipSrcImage

ITcVnImage

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 line segments (ContainerType_Vector_TcVnVector4_DINT; Each container element contains the two ending points. 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

fMinLineLength

LREAL

Minimum line length to search for

fMaxLineGap

LREAL

Maximum gap between points on the same line

hrPrev

HRESULT

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

F_VN_HoughLinesPExp 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