VarianceFilter

Calculates the local variance of an image.

Syntax

Definition:

HRESULT VarianceFilter(
    HRESULT                        hrPrev,
    ITcVnImage*                    ipSrcImage,
    ITcVnImage*&                   ipDestImage,
    ULONG                          nKernelSize,
    double                         fScale = 1,
    ETcVnBorderInterpolationMethod eBorderType = BIM_DEFAULT
)

Parameters

Name

Type

Default

Description

hrPrev

HRESULT

 

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

ipSrcImage

ITcVnImage*

 

Source image. Only TCVN_ET_USINT Type is supported.

ipDestImage

ITcVnImage*&

 

Destination image of type TCVN_ET_UINT (An appropriate destination image will be created if required.)

nKernelSize

ULONG

 

Size of the kernel

fScale

double

1

Scale factor for the computed variance values

eBorderType

ETcVnBorderInterpolationMethod

BIM_DEFAULT

Image border handling

VarianceFilter 1: Return value

HRESULT

Required License

TC3 Vision Base

System Requirements

Development environment

Target platform

PLC libraries to include

TwinCAT V3.1.4024.59 or later

PC or CX (x64) with min. PL50, e.g. Intel 4-core Atom CPU

Tc3_Vision