F_VN_LocalMinima

Find local minima in a gray-scale single-channel image. The found minima are marked by a value of 1 in the destination image.

Syntax

Definition:

FUNCTION F_VN_LocalMinima : HRESULT
VAR_INPUT
    ipSrcImage  : ITcVnImage;
    ipDestImage : Reference To  ITcVnImage;
    hrPrev      : HRESULT;
END_VAR

Inputs

Name	Type	Description
ipSrcImage	ITcVnImage	Source image (USINT or UINT, 1 channel)
ipDestImage	Reference To ITcVnImage	Destination image (Must be different from ipSrcImage! An appropriate destination image will be created if required.)
hrPrev	HRESULT	HRESULT indicating the result of previous operations (If SUCCEEDED(hrPrev) equals false, no operation is executed.)

Return value

HRESULT

Further information

The function F_VN_LocalMinima finds local minima in the input image.

Parameter

Input image

The input image ipSrcImage must be a 1-channel grayscale image with a bit depth of 8 or 16 bits (USINT or UINT).

Result image

The result image ipDestImage is of the same type as the input image ipSrcImage. Each local minimum of the input image is marked here by a pixel value of 1.

Application

The finding of local minima looks like this:

hr := F_VN_LocalMinima(
    ipSrcImage  :=  ipImageIn,
    ipDestImage :=  ipImageRes,
    hrPrev      :=  hr
);

Samples

Removing local extremes

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