Table Of Contents

Label (G Dataflow)

Last Modified: June 25, 2019

Labels the particles in a binary image.

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image src

Reference to the source image.

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image dst

Reference to the destination image.

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connectivity 4/8?

Boolean value that specifies the mode of connectivity used by the algorithm for particle detection.

8 (TRUE) Particle detection is performed in connectivity mode 8.
4 (FALSE) Particle detection is performed in connectivity mode 4.

The connectivity mode directly determines whether an adjacent pixel belongs to the same particle or a different particle.

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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image dst out

Reference to the destination image.

If image dst is connected, image dst out is the same as image dst. Otherwise, image dst out refers to the image referenced by image.

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number of particles

Number of particles detected in the image.

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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.

Labeling Particles

This node applies a unique grayscale value to all pixels composing the same group of pixels, or a particle. The value is encoded in 8 or 16 bits, depending on the image type. For example, 255 particles can be labeled in an 8-bit image and 65,535 particles in a 16-bit image. If you want to label more than 255 particles in an 8-bit image, you can cast the image into a 16-bit image using the Cast Image node and then label the particles.

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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