F_VN_HistogramEqualizationExp

F_VN_HistogramEqualizationExp 1:

Equalize the histogram of a grayscale or color image, which normalizes the brightness and improves the contrast. (expert function) The channel index that should be equalized has to be specified (-1 expects a RGB image, converts it to YCbCr, equalizes the Y channel and converts the image back to RGB).
Can use available TwinCAT Job Tasks for executing parallel code regions.

Syntax

Definition:

FUNCTION F_VN_HistogramEqualizationExp : HRESULT
VAR_INPUT
    ipSrcImage  : ITcVnImage;
    ipDestImage : Reference To  ITcVnImage;
    nChannelIdx : INT;
    hrPrev      : HRESULT;
END_VAR

F_VN_HistogramEqualizationExp 2: Inputs

Name

Type

Description

ipSrcImage

ITcVnImage

Source image (USINT)

ipDestImage

Reference To ITcVnImage

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

nChannelIdx

INT

Index of the image channel that should be equalized (-1 expects a RGB image, converts it to YCbCr, equalizes the Y channel and converts the image back to RGB)

hrPrev

HRESULT

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

F_VN_HistogramEqualizationExp 3: Return value

HRESULT

Required License

TC3 Vision Base

System Requirements