F_VN_KeyPointsSBExp

Detects keypoints using a Simple Blob method (expert function) - several iterations apply different thresholds to source image - connected components (blobs) are detected - the center and radius of the blobs are returned as keypoints
Can use available TwinCAT Job Tasks for executing parallel code regions.

Syntax

Definition:

FUNCTION F_VN_KeyPointsSBExp : HRESULT
VAR_INPUT
    ipSrcImage  : ITcVnImage;
    ipKeyPoints : Reference To  ITcVnContainer;
    ipMask      : ITcVnImage;
END_VAR
VAR_IN_OUT
    stParams    : TcVnParamsSB;
END_VAR
VAR_INPUT
    hrPrev      : HRESULT;
END_VAR

Inputs

Name	Type	Description
ipSrcImage	ITcVnImage	Source image
ipKeyPoints	Reference To ITcVnContainer	Returns a container which is filled with the keypoints (ContainerType_Vector_TcVnKeyPoint; Non-zero interface pointers are reused.)
ipMask	ITcVnImage	Mask to specify, where to look for keypoints (optional, set to 0 if not required)
hrPrev	HRESULT	HRESULT indicating the result of previous operations (If SUCCEEDED(hrPrev) equals false, no operation is executed.)

In/Outputs

Name	Type	Description
stParams	TcVnParamsSB	Several parameters to filter the detected blobs

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