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 and change the time interval of the signal. 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). The ROIs can be pixel labels or non-pixel ROI labels that include line, rectangle, cuboid, and projected cuboid.

TaskAction
Undo labeling actionCtrl+Z
Redo labeling actionCtrl+Y
Select all non-pixel ROIsCtrl+A
Select specific non-pixel ROIsHold Ctrl and click the ROIs you want to select
Cut selected non-pixel ROIsCtrl+X
Copy selected non-pixel ROIs to clipboardCtrl+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 (Computer Vision Toolbox).

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 labelHold 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 ROIsDelete
Copy all pixel ROIsCtrl+Shift+C
Cut all pixel ROIsCtrl+Shift+X
Paste copied or cut pixel ROIsCtrl+Shift+V
Delete all pixel ROIsCtrl+Shift+Delete

Fill all or all remaining pixels

Shift+click

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.

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.

Move multiple cuboids simultaneously

Follow these steps:

  1. Hold Ctrl and click the cuboids that you want to move.

  2. 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.

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, Panning, and Rotating

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 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 framePress 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 frameHold Shift and press the up, down, left, or right arrows

Rotate a point cloud frame

Hold R and click and drag the point cloud frame

Note

Only yaw rotation is allowed.

App Sessions

TaskAction
Save current sessionCtrl+S

See Also

Related Topics