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Light Meter (Light Meter (Point)) (G Dataflow)

Last Modified: June 25, 2019

Measures the pixel intensities in a 3 x 3 pixel neighborhood centered on a point of an image.

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image in

Reference to the source image.

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point

Cluster that specifies the coordinates of the intensity measurement.

The intensity measurement is made in a 3 × 3 pixel neighborhood centered on the point coordinates.

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x

X-coordinate of the point.

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y

Y-coordinate of the point.

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overlay search area?

Boolean input that specifies whether the node overlays the location of the intensity measurement on the image.

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coordinate system

Coordinate system to which the point is linked.

If the coordinate system input is used (connected), the location of the intensity measurement is shifted and rotated by the difference between the reference position of the coordinate system and its new location.

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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 result image. The search area may be overlaid on the image according to the setting show search area.

The search area may be overlaid on the image according to the setting show search area.

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intensity

Average intensity of the pixels in a 3 x 3 neighborhood centered on point.

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coordinate system dup

Reference to the coordinate system.

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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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