Clahe

Apply Constrast Limited Adaptive Histogram Equalization. This applies local histogram equalization to individual tiles.
Can use available TwinCAT Job Tasks for executing parallel code regions.

Syntax

Definition:

HRESULT Clahe(
    HRESULT      hrPrev,
    ITcVnImage*  ipSrcImage,
    ITcVnImage*& ipDestImage,
    double       fClipLimit = 40,
    ULONG        nTilesX = 8,
    ULONG        nTilesY = 8
)

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 (TCVN_ET_USINT or TCVN_ET_UINT, 1 channel)

ipDestImage

ITcVnImage*&

 

Returns the resulting image (An appropriate image will be created if required.)

fClipLimit

double

40

Threshold for contrast limit (set to <= 0 to disable clipping)

nTilesX

ULONG

8

Number of tiles in x direction

nTilesY

ULONG

8

Number of tiles in y direction

Clahe 1: Return value

HRESULT

Required 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