# Train Region Features

Use the following parameters to define the train region:

Parameter | Description
--- | ---
Region Mode | Defines the type of bounding box for the region. Pixel Aligned Bounding Box encloses the defined region within a rectangle, so that portions of the image outside the defined region but within the bounding rectangle are included. Pixel Aligned Bounding Box Adjust Mask encloses the defined region within a rectangle, but masks out the image portions that are outside the region but inside the enclosing rectangle.
Region Shape | Defines the shape of the input region. Selecting None = Use entire image means that the tool uses the entire input image. A PatMax RedLine tool supports the following input region shapes: CogCircle CogEllipse CogPolygon CogRectangle CogRectangleAffine CogCircularAnnulusSection CogEllipticalAnnulusSection The set of region-defining parameters that appear depend on the region shape you use.
Selected Space Name | The coordinate space of the training region. For information, see Coordinate Space Names.
Select Mode | Available when Region Shape is cogRectangle or cogRectangleAffine. Selects the set of parameters that define the rectangle. If cogRectangleAffine is chosen, note that the angles of rotation and skew can be specified in degrees or radians, although the underlying tool keeps the measurements in radians.
Fit In Image | Centers the train region within Current.TrainImage.