# Transform ROI (G Dataflow)

Rotates and translates an ROI in an image to transform the ROI from one coordinate system (initial reference) to another (new reference).

## ROI descriptor

Input that defines the region of interest.

### global rectangle

Minimum rectangle required to contain all of the contours in the ROI.

### Contours

Individual shapes that define an ROI.

#### ID

Object specifying if contour is the external or internal edge of an ROI.

#### Type

Shape type of the contour.

#### Coordinates

Relative position of the contour.

## initial reference

Base coordinate system.

### origin

Point cluster that specifies the origin of the base reference coordinate system.

### angle (deg)

Angle the base reference coordinate system makes with the image coordinate system.

### axis reference

Element defined as direct or indirect.

## new reference

New coordinate system.

### origin

Point cluster that specifies the origin of the base reference coordinate system.

### angle (deg)

Angle the base reference coordinate system makes with the image coordinate system.

### axis reference

Element defined as direct or indirect.

## 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

## ROI descriptor out

New ROI descriptor for the transformed ROI.

### global rectangle

Coordinates of the bounding rectangle.

### contours

Individual shapes that define an ROI.

#### ID

Control specifying whether the contour is the external or internal edge of an ROI.

#### type

Shape type of the contour.

#### coordinates

Relative position of the contour.

## 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