Machine Vision Functions

Machine Vision functions allow you to perform common machine vision inspection tasks, including detecting the presence or absence of parts in an image and measuring the dimensions of parts to see if they meet specifications.

The Machine Vision functions are open source, which allows you to use the source code as examples for particular applications and to examine the operation of the code at run-time. The Machine Vision functions have a separate function panel from the other NI Vision functions (NIMachineVision.fp).

To load the Machine Vision functions, select Instrument»Load from the LabWindows/CVI project window, browse to the <CVI>\toolslib\vision directory, and select nimachinevision.fp. You can now access all of the function panels from the Instrument menu. Because the functions are open source, you can view the source by examining the NIMachineVision.c file.

Note  Do not make changes directly to the file because future installations may overwrite your changes. Instead, copy the function you want to modify to another source file and modify it there.

The following table lists the Machine Vision functions. The functions in the Machine Vision class are grouped according to the types of operations they perform. The first column contains the name of the class. The second column contains names of function subclasses. The third column contains names of individual function panels. Each Machine Vision function panel represents one function.

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Coordinate Transform Functions

Coordinate Transform functions allow you to find various types of coordinate transforms in an image. Use these functions to find a coordinate transform using either edge detection or pattern matching.

Class	Subclass	LabWindows/CVI Equivalent	Function Name
Machine Vision	Coordinate Transform	Find Transform Pattern	imaqFindTransformPattern

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Count and Measure Objects Functions

Count and Measure Objects functions allow you to count and measure objects in an image.

Class	Subclass	LabWindows/CVI Equivalent	Function Name
Machine Vision	Count and Measure Objects	Count Objects	imaqCountObjects
Machine Vision	Count and Measure Objects	Dispose Object Report	imaqDisposeObjectReport

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Find Patterns Functions

Find Patterns functions allow you to find a pattern in an image.

Class	Subclass	LabWindows/CVI Equivalent	Function Name
Machine Vision	Find Patterns	Find Pattern	imaqFindPattern

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Locate Edges Functions

Locate Edges functions allow you to find straight or circular edges in an image.

Class	Subclass	LabWindows/CVI Equivalent	Function Name
Machine Vision	Locate Edges	Dispose Circular Edge Report	imaqDisposeCircularEdgeReport
Machine Vision	Locate Edges	Dispose Straight Edge Report	imaqDisposeStraightEdgeReport
Machine Vision	Locate Edges	Find Circular Edge	imaqFindCircularEdge
Machine Vision	Locate Edges	Find Concentric Edge	imaqFindConcentricEdge

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Measure Distances Functions

Measure Distances functions allow you to measure distances in an image, such as the minimum or maximum horizontal separation between two vertically oriented edges.

Class	Subclass	LabWindows/CVI Equivalent	Function Name
Machine Vision	Measure Distances	Clamp Max	imaqClampMax
Machine Vision	Measure Distances	Clamp Min	imaqClampMin

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Measure Intensities Functions

Measure Intensities functions allow you to measure the intensity of a specific region of an image.

Class	Subclass	LabWindows/CVI Equivalent	Function Name
Machine Vision	Measure Intensities	Light Meter Line	imaqLightMeterLine
Machine Vision	Measure Intensities	Light Meter Point	imaqLightMeterPoint
Machine Vision	Measure Intensities	Light Meter Rect	imaqLightMeterRect

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Select Region of Interest Functions

Select Region of Interest functions allow you to select a specific region of an image.

Class	Subclass	LabWindows/CVI Equivalent	Function Name
Machine Vision	Select Region of Interest	Select Annulus	imaqSelectAnnulus
Machine Vision	Select Region of Interest	Select Line	imaqSelectLine
Machine Vision	Select Region of Interest	Select Point	imaqSelectPoint
Machine Vision	Select Region of Interest	Select Rect	imaqSelectRect