Table Of Contents

Match Feature Points (G Dataflow)

Last Modified: June 25, 2019

Computes correspondence between feature points.

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feature points 1

Locations of the feature points detected in image 1.

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x

X-coordinate of the point.

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y

Y-coordinate of the point.

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feature descriptors 1

Descriptors for all the feature points detected in image 1.

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feature points 2

Locations of the feature points detected in image 2.

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x

X-coordinate of the point.

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y

Y-coordinate of the point.

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feature descriptors 2

Descriptors for all the detected feature points in image 2.

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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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max acceptable distance

Maximum difference between the two feature point descriptors above which the points will not be considered as a match.

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error threshold

Error tolerance in pixels during the matching process.

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match locations

Coordinates of the all the feature points that match between the two images.

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image 1

Coordinates of the first 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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image2

Coordinates of the second 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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match scores

Scores of all the feature points that are matches between the two images.

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homography matrix

Indicator that returns the homography matrix between the two images.

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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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