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Calibration Target to Points - Circular Dots (G Dataflow)

Last Modified: October 26, 2017

Detects circular dots in a binary image and returns the pixel and real world points for calibration.

Refines the location of circular dots using a supplied grayscale image.

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ROI descriptor

ROI to be corrected.

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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

Object specifying if 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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target image

Image containing circular dots.

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grayscale image

Corresponding grayscale image containing dark circular dots, for refining the location of the cirular dots in the target image.

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grid descriptor

Spacing between dots in the grid in real-world units.

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X Step

Width of a pixel in real-world units.

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Y Step

Height of a pixel in real-world units.

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Unit

Unit for X Step and Y Step.

The following options are valid:

Name Description
Undefined Units are undefined.
Angstrom Units are measured in angstroms.
Micrometer Units are measured in micrometers.
Millimeter Units are measured in millimeters.
Centimeter Units are measured in centimeters.
Meter Units are measured in meters.
Kilometer Units are measured in kilometers.
Microinch Units are measured in microinches.
Inch Units are measured in inches.
Feet Units are measured in feet.
Nautical miles Units are measured in nautical miles.
Standard miles Units are measured in standard miles.
Steps Units are measured in steps.
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grid size

Number of dots to use in the x and y direction. Specifying 0 for Max X and 0 for Max Y uses all dots in the grid.

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Max X

Number of dots in the grid in the x direction.

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Max Y

Number of dots in the grid in the y direction.

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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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target image dup

Reference to target image.

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calibration reference points

Locations of the grid dots used as reference points to learn a calibration.

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Pixel Coordinates

Coordinates of the pixels found in the image.

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X

X-coordinate of the point.

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Y

Y-coordinate of the point.

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Real World Coordinates

Relative locations of the dots in the real world.

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X

X-coordinate of the point.

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Y

Y-coordinate of the point.

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Unit

Unit of the Real World Coordinates.

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Image Size

Size of the calibration template image.

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X

Horizontal size of the image.

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Y

Vertical size of 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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