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Find Circles (G Dataflow)

Last Modified: June 25, 2019

Separates overlapping circular particles and classifies them based on their radius, surface area, and perimeter.

Starting from a binary image, Find Circles finds the radius and center of the circular particles even when multiple circular particles overlap. In addition, this node can trace the circles in the destination image by constructing and using a distance map to determine the radius of each particle. This node modifies the source image. If you need the original source image, create a copy of the image using the Copy Image node before using this nodeI.

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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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minimum radius

Smallest radius, in pixels, to detect.

Default: 1

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maximum radius

Largest radius, in pixels, to detect.

Default: 10

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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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circles information

Array of measurements for all detected circles.

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pos. x

Horizontal position, in pixels, of the center of the circle.

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pos. y

Vertical position, in pixels, of the center of the circle.

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radius

Radius of the circle in pixels.

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core area

Surface area, in pixels, of the nucleus of the circle as defined by the Danielsson distance map.

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number of circles

Number of circles detected in the 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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