NI Vision for LabVIEW

IMAQ Extract Tetragon VI

  • Updated2023-02-21
  • 8 minute(s) read
Owning Palette: Image Manipulation
Requires: NI Vision Development Module

Extracts a tetragon from the source image. The tetragon can be wired to a ROI or an array points. The array must contain four points, starting with the point that will be extracted into the upper left corner of the destination and proceeding clockwise.

IMAQ Extract Tetragon (Point Array)

Extracts a tetragon from the source image.

IMAQ Extract Tetragon (Point Array)

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Options is a cluster containing information about the destination image.

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Interpolation Type specifies the interpolation method used to locate the edge position.

Choose from the following options:

Zero Order (0)

Rounds to the nearest integral edge location

Bilinear (1)

Uses bilinear interpolation to compute the edge location

Bilinear Fixed (4)

(Default) Uses the fixed-point computation of bilinear interpolation to determine the edge location

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Destination Width specifies the width of the destination image.

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Destination Height specifies the height of the destination image.

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Fill Value is the value used for the highlighted pixels in the destination image. The default is 0.

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Image Src is a reference to the source image.

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Image Dst is a reference to the destination image.

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Tetragon is an array of four points that define the boundary of the tetragon in the image.

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x is the x-coordinate of the point.

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y is the y-coordinate of the point.

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error in (no error) describes the error status before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.

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status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.

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code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.

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source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

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Image Dst Out is a 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 contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.

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status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.

ii32.gif

code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.

istr.gif

source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

IMAQ Extract Tetragon (ROI)

Extracts a tetragon from the source image.

IMAQ Extract Tetragon (ROI)

cnclst.gif

Options is a cluster containing information about the destination image.

cenum.gif

Interpolation Type specifies the interpolation method used to locate the edge position.

Choose from the following options:

Zero Order (0)

Rounds to the nearest integral edge location

Bilinear (1)

Uses bilinear interpolation to compute the edge location

Bilinear Fixed (4)

(Default) Uses the fixed-point computation of bilinear interpolation to determine the edge location

cu32.gif

Destination Width specifies the width of the destination image.

cu32.gif

Destination Height specifies the height of the destination image.

csgl.gif

Fill Value is the value used for the highlighted pixels in the destination image. The default is 0.

cgenclasstagrefflat.gif

Image Src is a reference to the source image.

cgenclasstagrefflat.gif

Image Dst is a reference to the destination image.

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ROI Descriptor is a descriptor that defines the rectangle, rotated rectangle, or other four-side rectangular polygon within which the edge detection is performed.

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Global Rectangle contains the coordinates of the bounding rectangle.

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Contours are each of the individual shapes that define an ROI.

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ID refers to whether the contour is the external or internal edge of an ROI.

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Type is the shape type of the contour.

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Coordinates indicates the relative position of the contour.

cerrcodeclst.gif

error in (no error) describes the error status before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.

cbool.gif

status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.

ci32.gif

code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.

cstr.gif

source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

igenclasstagrefflat.gif

Image Dst Out is a 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.

ierrcodeclst.gif

error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.

ibool.gif

status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.

ii32.gif

code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.

istr.gif

source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.