Table Of Contents

Learn Geometric Pattern (G Dataflow)

Last Modified: June 25, 2019

Creates a description of the template image for which you want to search during the matching phase.

This description data is appended to the input template image. During the matching phase, the description data is extracted from the template image and used to search for the template in the inspection image.

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image in

Reference to the template image in which to search in the inspection image during the matching phase.

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learn mask

Optional, 8-bit image of the same size as the template that specifies where to search for edges in the template.

Use the following pixel values when constructing the mask:

  • 0—Maintains the default behavior. The corresponding pixel in the template image is considered an edge only if it meets the conditions specified by the curve parameters in the Setup Learn Geometric Pattern node or the Advanced Setup Learn Geometric Pattern node.
  • 1—The corresponding pixel in the template image is never considered an edge.
  • 2—The corresponding pixel in the template image is always considered an edge.
  • 4—The corresponding pixel in the template image is not used when computing the correlation score.
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weight map

Image to specify weights to suppress noise and false defects in the defect map.

Pixels with lower weights are enhanced and pixels with higher weights are suppressed in the defect map. weight map is used with the Calculate Defect Map node.

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learn geometric pattern setup data

String that contains information obtained from the Setup Learn Geometric Pattern node or the Advanced Setup Learn Geometric Pattern node.

If this input is not connected, the node uses default parameters during the learning phase.

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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angle offset

Angle by which each match is rotated round the origin of the template.

The angle offset is used by the Match Geometric Pattern node to set the angle element of the resulting matches cluster for each template match within a target image. The default value is 0, which does not change the angle of the matches.

Default: 0

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origin offset

Number of pixels the node shifts the origin of the template from the center of the template image.

The origin offset is used by the Match Geometric Pattern node to set the position element of the resulting matches cluster for each template match within a target image. The default value is (0, 0), which sets the center of the template image as the origin of the template.

Default: (0, 0)

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template image out

Reference to the template.

This template image contains the data that defines the template pattern for the matching phase.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application


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