Keyboard Shortcuts and Mouse Actions for Ground Truth Labeler

Note

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

Label Definitions

TaskAction
In the ROI Label Definition pane, navigate through ROI labels and their groups Up arrow or down arrow
In the Scene Label Definition pane, navigate through scene labels and their groups Hold Alt and press the up arrow or down arrow
Reorder labels within a group or move labels between groupsClick and drag labels
Reorder groupsClick and drag groups

Frame Navigation and Time Interval Settings

Navigate between frames in a video or image sequence, and change the time interval of the video or image sequence. These controls are located in the bottom pane of the app.

TaskAction
Go to the next frameRight arrow
Go to the previous frameLeft 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 interval boxes and frame navigation buttonsTab
Commit time interval settingsPress 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).

TaskAction
Undo labeling actionCtrl+Z
Redo labeling actionCtrl+Y
Select all rectangle and line ROIsCtrl+A
Select specific rectangle and line ROIsHold Ctrl and click the ROIs you want to select
Cut selected rectangle and line ROIsCtrl+X
Copy selected rectangle and line ROIs to clipboardCtrl+C

Paste copied rectangle and line 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 (Computer Vision Toolbox).

Ctrl+V
Delete selected rectangle and line ROIsDelete
Copy all pixel ROIsCtrl+Shift+C
Paste copied pixel ROIsCtrl+Shift+V

Fill all or all remaining pixels

Shift+click

Cuboid Drawing

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.

TaskAction

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 cloudClick 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.

Rotate the point cloud display

Hold R and click and drag the point cloud display

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.

TaskAction
Commit a polyline to the frame, excluding the currently active line segmentPress 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 polylineBackspace
Cancel drawing and delete the entire polylineEscape

Polygon Drawing

Draw polygons to label pixels on a frame.

TaskAction
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 polygonBackspace
Cancel drawing and delete the entire polygonEscape

Zooming

Zooming in and out operates differently on the frames of an image signal than it does for the point clouds of a lidar signal.

TaskAction
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 draw a box around the section of the frame that you want to zoom in on

Zooming in on a specific section of a point cloud is not supported.

Zoom in on a point cloud

Move the scroll wheel up, or click within the point cloud and move the cursor up or left

Zooming in is supported in all modes (pan, zoom, and rotate).

Zoom out of a point cloud

Move the scroll wheel down, or click within the point cloud and move the cursor down or right

Zooming out is supported in all modes (pan, zoom, and rotate).

App Sessions

TaskAction
Save current sessionCtrl+S

See Also

Related Topics