Table Of Contents

Read Single Digit (G Dataflow)

Last Modified: June 25, 2019

Reads a single seven-segment digit from a rectangular area of interest drawn around this digit.

This node reads LCD and LED indicators and returns a value as a string and a cluster containing the state of each segment, on or off.

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LCD/LED?

Boolean that controls the indicator type.

TRUE LED indicator
FALSE LCD indicator

Default: FALSE

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image in

Reference to the source image.

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ROI descriptor

Descriptor that defines the ROI drawn by the user that corresponds to a quadrilateral surrounding the digit.

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Global Rectangle

Coordinates of the bounding rectangle.

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Contours

Individual shapes that define an ROI.

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ID

Object specifying if contour is the external or internal edge of an ROI.

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Type

Shape type of the contour.

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Coordinates

Relative position of the contour.

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threshold

Threshold that determines whether a segment is on or off.

A segment is considered on if the standard deviation of the pixels along a line profile across the segment is greater than this threshold. Increase this value when using images with high contrast. Lower this value when using images with low contrast.

Default: 8

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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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search decimal separator

Boolean that specifies if a decimal separator exists after each digit.

Default: FALSE

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string

Value of the digit and decimal separator.

If search decimal separator is enabled, the decimal separator is represented in the string by a period (.) symbol.

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number

Value represented by the digit.

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segments status

Cluster of Boolean indicators containing the state of each segment of the digit.

The order of the cluster is illustrated below.

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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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