Table Of Contents

Read PDF417 Barcode (G Dataflow)

Last Modified: June 25, 2019

Reads values encoded into a PDF417 barcode.

You can compare the decoded data to a reference string or check whether the data contains a specific pattern.

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image in

Reference to the source image.

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ROI descriptor

Descriptor that defines the region of interest within which the code is located.

The first contour of the ROI must be a rectangle, rotated rectangle, oval, annulus, polygon, or freehand region. If the ROI descriptor is empty or not connected, the entire image is considered to be the region.

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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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search mode

Input that specifies if the node searches for one or multiple codes.

Name Description
multiple barcodes Searches for multiple 2D barcodes.
single barcode, conservative Searches for 2D barcodes using the same searching algorithm as multiple barcodes but stops searching after locating one valid barcode.
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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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image out

Reference to the source image.

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PDF417 barcode reports

Cluster of information about each of the codes that the node read.

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type

Type of code.

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binary

Boolean that indicates if the barcode contains encoded non-ASCII binary data or ASCII text.

TRUE The barcode contains non-ASCII binary data.
FALSE The barcode contains ASCII text.
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data

Encoded information read by the node.

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bounding box

Array of five points that define the boundary of the code in the image.

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errors corrected

Number of erasures corrected using inherent error correction.

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erasures corrected

Number of erasures corrected using inherent error correction.

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rows

Number of rows in the barcode.

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columns

Number of columns in the barcode.

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number of barcodes

Number of codes detected and read by the node.

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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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