Table Of Contents

Track Objects (G Dataflow)

Last Modified: June 25, 2019

Tracks user-defined objects from image to image.

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tracking session in

Reference to the object tracking session.

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image in

Reference to the image to be used as the thumbnail of the sample.

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minimum score

Minimum score an object must have to be considered a match.

The range of values is 0 to 1000, with 1000 as a perfect match.

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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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tracking session out

Reference to the object tracking session.

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image out

Reference to the source image.

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objects (pixel)

Objects found in the image, in pixel coordinates.

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label

Label of the object in the tracking session.

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score

Score of the object being tracked.

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angle

Starting angle of the object to track.

This parameter only applies when using the shape adapted mean shift algorithm.

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location

x- and y-coordinates of the object being tracked.

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bounding box

Array that defines the boundary of the object being tracked in the image.

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object found?

Boolean that indicates if the object was found in the image.

TRUE The object was found.
FALSE The object was not found.
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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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objects (real-world)

Objects found in the image, in real-world units.

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label

Label of the object in the tracking session.

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score

Score of the object being tracked.

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angle

Starting angle of the object to track.

This parameter only applies when using the shape adapted mean shift algorithm.

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location

x- and y-coordinates of the object being tracked.

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bounding box

Array that defines the boundary of the object being tracked in the image.

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object found?

Boolean that indicates if the object was found in the image.

TRUE The object was found.
FALSE The object was not found.

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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