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Magic Wand (G Dataflow)

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Last Modified: October 25, 2017

Creates an image mask by extracting a region surrounding a reference pixel and using a tolerance of intensity variations based on this reference pixel.

Using this origin, the node searches for its neighbors with an intensity that equals or falls within the tolerance value of the point of reference. The resulting image is binary. The image passed as input for image dst must be an 8-bit image. If the same image is entered for image and image dst, the image must be an 8-bit 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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seed coordinates

Array containing the x, y coordinates of the origin pixel chosen from the image source.

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tolerance

Maximum allowed deviation from the origin.

All pixels satisfying the tolerance criteria between origin pixel -tolerance and origin pixel +tolerance and connectivity criteria as specified in connectivity 4/8? are highlighted. All other pixels are turned off.

Default: 20

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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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fill value

Value used for the highlighted pixels in the destination image.

Default: 1

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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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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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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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