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Gray Morphology Reconstruction (G Dataflow)

Last Modified: October 26, 2017

Performs morphological reconstruction on a grayscale image.

Morphological reconstruction reconstructs an image based on an image marker or array of points and highlights or removes small features without altering the shape of objects in the image.

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ROI descriptor

Region of interest (ROI) within which the morphological reconstruction is performed.

The ROI supports multiple contours. All contours are considered to be external. The operation applies to the entire image if ROI descriptor is empty or not connected.

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global rectangle

Coordinates of the bounding rectangle for the reconstruction.

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contours

Individual shapes that define an ROI.

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ID

Input that determines if 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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image src

Reference to the source image.

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image dst

Reference to the destination image.

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image marker

Reference to the marker image that defines where the reconstruction starts.

The node generates an error message if both array of points and image marker are specified.

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array of points

Array of point-coordinates in a source image that define where the reconstruction starts.

The node generates an error message if both image marker and array of points are specified.

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x

X-coordinate of a point defining the marker.

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y

Y-coordinate of a point defining the marker.

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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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operation

Reconstruction operation.

Name Description
dilation Dilation expands bright regions specified by the marker.
erosion Erosion expands dark regions specified by the marker.

Default: Dilation

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structuring element

2D array that contains the structuring element to apply to the image.

The size of the structuring element, or the size of this array, determines the processing size. A structuring element of 3 × 3 is used if this input is not connected.

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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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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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