F_VN_MatchImageHuMoments

F_VN_MatchImageHuMoments 1:

Compare two images using the Hu moment invariants.

Syntax

Definition:

FUNCTION F_VN_MatchImageHuMoments : HRESULT
VAR_INPUT
    ipImage1          : ITcVnImage;
    ipImage2          : ITcVnImage;
    eComparisonMethod : ETcVnContoursMatchComparisonMethod;
END_VAR
VAR_IN_OUT
    fDissimilarity    : LREAL;
END_VAR
VAR_INPUT
    hrPrev            : HRESULT;
END_VAR

F_VN_MatchImageHuMoments 2: Inputs

Name

Type

Description

ipImage1

ITcVnImage

First image (1 channel)

ipImage2

ITcVnImage

Second image (1 channel)

eComparisonMethod

ETcVnContoursMatchComparisonMethod

Method used for comparing the Hu moment invariants of the images

hrPrev

HRESULT

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

F_VN_MatchImageHuMoments 3: In/Outputs

Name

Type

Description

fDissimilarity

LREAL

Returns the dissimilarity of the image Hu moment invariants depending on the chosen comparison method

F_VN_MatchImageHuMoments 4: Return value

HRESULT

Required License

TC3 Vision Matching

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