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Light Meter (Light Meter (Rectangle)) (G Dataflow)

Last Modified: June 25, 2019

Measures the pixel intensities in a rectangle of an image.

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image in

Reference to the source image.

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rectangle

Coordinates of a rectangular area in which the intensity is measured.

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left

X-coordinate of the upper left corner of the rectangle.

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top

Y-coordinate of the upper left corner of the rectangle.

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right

X-coordinate of the bottom right corner of the rectangle.

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bottom

Y-coordinate of the bottom right corner of the rectangle.

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rotation

Rotation angle in degrees of the rectangle with its center as point of rotation.

If the rotation angle does not equal zero, the left, top, right, and bottom coordinates are not the actual coordinates of the upper left and bottom right corner of the rectangle. Instead these coordinates are a position, if the rotation angle equals zero.

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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 rectangle 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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intensities

Cluster that contains the intensity measurements.

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mean intensity

Average of the pixel intensities.

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standard deviation

Standard deviation of the pixel intensities.

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minimum intensity

Minimum of the pixel intensities.

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maximum intensity

Maximum of the pixel intensities.

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histogram

Histogram of the pixel intensities in the rectangle area.

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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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