Keyboard Shortcuts and Mouse Actions for Ground Truth Labeler

Note

On Macintosh platforms, use the Command (⌘) key instead of Ctrl.

Label Definitions

Task	Action
Navigate through ROI labels and their groups in the ROI Label Definition pane	Up or Down arrow
Navigate through scene labels and their groups in the Scene Label Definition pane	Hold Alt and press the up arrow or down arrow
Reorder labels within a group or move labels between groups	Click and drag labels
Reorder groups	Click and drag groups

Frame Navigation and Time Interval Settings

Navigate between frames and change the time range of the signal. These controls are located in the bottom pane of the app.

Task	Action
Go to the next frame	Right arrow
Go to the previous frame	Left arrow
Go to the last frame	PC: End Mac: Hold Fn and press the right arrow
Go to the first frame	PC: Home Mac: Hold Fn and press the left arrow
Navigate through time range boxes and frame navigation buttons	Tab
Commit time interval settings	Press Enter within the active time interval box (Start Time, Current, or End Time)

Labeling Window

Perform labeling actions, such as adding, moving, and deleting regions of interest (ROIs). The ROIs can be pixel labels or non-pixel ROI labels that include line, rectangle, cuboid, and projected cuboid.

Task	Action
Undo labeling action	Ctrl+Z
Redo labeling action	Ctrl+Y
Select all non-pixel ROIs	Ctrl+A
Select specific non-pixel ROIs	Hold Ctrl and click the ROIs you want to select
Cut selected non-pixel ROIs	Ctrl+X
Copy selected non-pixel ROIs to clipboard	Ctrl+C
Paste copied non-pixel ROIs If a sublabel was copied, both the sublabel and its parent label are pasted. If a parent label was copied, only the parent label is pasted, not its sublabels. For more details, see Use Sublabels and Attributes to Label Ground Truth Data.	Ctrl+V
Switch between selected non-pixel ROI labels. You can switch between labels only of the same type. For example, if you select a rectangle ROI, you can switch only between other rectangle ROIs.	Tab or Shift+Tab
Move a drawn non-pixel ROI label	Hold Ctrl and press the up, down, left or right arrows
Resize a rectangle ROI uniformly across all dimensions	Ctrl+Plus (+) or Ctrl+Minus (-)
Delete selected non-pixel ROIs	Delete
Copy all pixel ROIs	Ctrl+Shift+C
Cut all pixel ROIs	Ctrl+Shift+X
Paste copied or cut pixel ROIs	Ctrl+Shift+V
Delete all pixel ROIs	Ctrl+Shift+Delete
Fill all or all remaining pixels	Shift+click
Create an ROI around the entire frame	Double-click on canvas with label definition selected

Cuboid Resizing and Moving

Draw cuboids to label lidar point clouds. For examples on how to use these shortcuts to label lidar point clouds efficiently, see Label Lidar Point Clouds for Object Detection.

Note

To enable these shortcuts, you must first click within the point cloud frame to select it.

Task	Action
Resize a cuboid uniformly across all dimensions before applying it to the point cloud	Hold A and move the scroll wheel up to increase size or down to decrease size
Resize a cuboid along only the x-dimension before applying it to the point cloud	Hold X and move the scroll wheel up to increase size or down to decrease size
Resize a cuboid along only the y-dimension before applying it to the point cloud	Hold Y and move the scroll wheel up to increase size or down to decrease size
Resize a cuboid along only the z-dimension before applying it to the point cloud	Hold Z and move the scroll wheel up to increase size or down to decrease size
Resize a cuboid after applying it to the point cloud	Click and drag one of the cuboid faces
Move a cuboid	Hold Shift and click and drag one of the cuboid faces The cuboid is translated along the dimension of the selected face.
Move multiple cuboids simultaneously	Follow these steps: Hold Ctrl and click the cuboids that you want to move. Hold Shift and click and drag a face of one of the selected cuboids. The cuboids are translated along the dimension of the selected face.

Polyline Drawing

Draw ROI line labels on a frame. ROI line labels are polylines, meaning that they are composed of one or more line segments.

Task	Action
Commit a polyline to the frame, excluding the currently active line segment	Press Enter or right-click while drawing the polyline
Commit a polyline to the frame, including the currently active line segment	Double-click while drawing the polyline A new line segment is committed at the point where you double-click.
Delete the previously created line segment in a polyline	Backspace
Cancel drawing and delete the entire polyline	Escape

Polygon Drawing

Draw polygons to label pixels on a frame.

Task	Action
Commit a polygon to the frame, excluding the currently active line segment	Press Enter or right-click while drawing the polygon The polygon closes up by forming a line between the previously committed point and the first point in the polygon.
Commit a polygon to the frame, including the currently active line segment	Double-click while drawing polygon The polygon closes up by forming a line between the point where you double-clicked and the first point in the polygon.
Remove the previously created line segment from a polygon	Backspace
Cancel drawing and delete the entire polygon	Escape

Zooming, Panning, and Rotating

Task	Action
Zoom in or out of an image frame	Move the scroll wheel up to zoom in or down to zoom out If the frame is in pan mode, then zooming is not supported. To enable zooming, in the upper-right corner of the frame, either click the Pan button to disable panning or click one of the zoom buttons.
Zoom in on specific section of an image frame	In the upper-right corner of the frame, click the Zoom In button and then click and drag within the frame to draw a box around the section that you want to zoom in on Zooming in on a specific section of a point cloud is not supported.
Pan across an image frame	Press the up, down, left, or right arrows
Zoom in on or out of a point cloud frame	In the top-left corner of the display, click the Zoom In or Zoom Out button. Then, move the scroll wheel up (zoom in) or down (zoom out). Alternatively, move the cursor up or right (zoom in) or down or left (zoom out). Zooming in and out is supported in all modes (pan, zoom, and rotate).
Pan across a point cloud frame	Press the a, d, w, and s keys. w — To move forward s — To move backward a — To move left d — To move right
Rotate a point cloud frame	Hold R and click and drag the point cloud frame Note Only yaw rotation is allowed.

App Sessions

Task	Action
Save current session	Ctrl+S