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Watershed Transform (G Dataflow)

Last Modified: June 25, 2019

Computes the watershed transform on an image.

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image src

Reference to the source image.

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image dst

Reference to the destination image.

If image dst is connected, it must be the same size as image. If image dst is an 8-bit image, the node can store up to 255 unique labels not including the watershed line value of 0. If image dst is a 16-bit image, the node can store up to 32,767 unique labels not including the watershed line value of 0.

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connectivity 4/8?

Watershed transform algorithm for determining whether an adjacent pixel belongs to the same or different catchment basin or watershed line.

The following values are possible:

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

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 src.

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number of regions

Number of zones detected in the image.

A zone is a region of the image in which all of the pixels belong to the same catchment basin.

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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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