Table Of Contents

Read Text 4 (G Dataflow)

Last Modified: June 25, 2019

Reads the text in the image.

The node identifies all objects in the image based on the properties that you set and then compares each object with every character in the character set file. For each object, the node selects the character that most closely matched the object. The node uses the substitution character for any object that did not match any of the trained characters. Use the substitution character property to specify the substitution character.

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ROI descriptor

ROI in which the node performs the operation.

The ROI must be a rectangle or rotated rectangle. Leave this input unwired to use the entire image for this operation.

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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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OCR session in

OCR session on which the node operates.

To create a session, use the Create OCR Session node.

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image in

Source image for the operation.

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number of lines requested

Number of lines to read.

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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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orientation

Orientation of the image data within the circular strip.

Name Value Description
baseline inside 0

(Default) Specifies that the base of the image data is located along the inside edge of the circular strip.

baseline outside 1

Specifies that the base of the image data is located along the outside edge of the circular strip.

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character reports

Additional information about each character that the node reads from the image.

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character value

Identified character.

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classification score

Degree to which the assigned character class represents the object better than the other character classes in the character set.

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verification score

Verification score computed against the reference character for the character class.

If a reference character does not exist for the character class, the score will be 0.

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verified

Boolean that specifies if the character has been verified against a reference character found for the character class.

TRUE The character has been verified against a reference character was found for the character class.
FALSE The character has not been verified.

Default: FALSE

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character statistics

Cluster containing statistics about the characters OCR segmented in the ROI.

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threshold range

Range used to threshold the character.

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lower value

Lowest pixel value used during a manual threshold.

Default: 128

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upper value

Highest pixel value used during a manual threshold.

Default: 255

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left offset

Left offset of the character bounding rectangles in the current ROI.

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top offset

Top offset of the character bounding rectangles in the current ROI.

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width

Width of each of the characters trained in the current ROI.

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height

Height of each of the characters trained in the current ROI.

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character size

Size of the character, in pixels.

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OCR session out

OCR session on which this node operates.

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image out

Reference to the source image.

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number of lines read

Output that indicates the number of lines read.

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read string

String that the node read.

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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.
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characters ROI

Array that specifies the coordinates of the character bounding ROI.

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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

Control specifying whether the 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.

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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