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Convert to ROI (Convert Annulus to ROI) (G Dataflow)

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Last Modified: June 25, 2019

Converts an annulus to an ROI descriptor.

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annulus

Coordinates of an annular region of interest in an image.

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center x

X-coordinate of the center of the circle or annulus.

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center y

Y-coordinate of the center of the circle or annulus.

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inner radius

Radius (in pixels) of the inner circle defining one edge of the circular strip.

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outer radius

Radius (in pixels) of the outer circle defining the second edge of the circular strip.

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start angle

First angle of the circular strip.

The angle is measured counterclockwise from the x-axis of a coordinate system centered on the center of the circle or annulus.

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end angle

Second angle of the circular strip.

The angle is measured counterclockwise from the x-axis of a coordinate system centered on the center of the circle or annulus.

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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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ROI descriptor

Descriptor that defines an annulus.

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global rectangle

Coordinates of the bounding rectangle.

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contours

Individual shapes that define an ROI.

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ID

Control specifying whether the contour is the external or internal edge of an ROI.

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type

Shape type of the contour.

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coordinates

Relative position of the contour.

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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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