Keyboard Shortcuts and Mouse Actions for Image Labeler

Note

On Macintosh platforms, use the Option (⌥) key instead of Alt.

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,	Up or Down arrow
Reorder labels within a group or move labels between groups	Click and drag labels
Reorder groups	Click and drag groups

Image Browsing and Selection

Browse and select images from the image browser, which is located in the bottom pane of the app.

Task	Action
Browse through images one at a time	Alt left or right arrow
Browse to the next set of images that is viewable in the image browser	PC: Page Up and Page Down Mac: Hold Fn and press the up and down arrows
Go to the first image	PC: Home Mac: Hold Fn and press the left arrow
Go to the last image	PC: End Mac: Hold Fn and press the right arrow
Select all images from the current image to the first image	PC: Shift+Home Mac: Hold Fn+Shift and press the left arrow
Select all images from the current image to the last image	PC: Shift+End Mac: Hold Fn+Shift and press the right arrow
Select all images from the current image to a specific image	Hold Shift and click the final image in the range
Select a specific set of images	Hold Ctrl and click the images you want to select

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
Delete selected non-pixel ROIs	Delete
Cut all pixel ROIs	Ctrl+Shift+X
Copy all pixel ROIs	Ctrl+Shift+C
Paste copied or cut pixel ROIs	Ctrl+Shift+V
Delete all pixel ROIs	Ctrl+Shift+Delete
Fill all or all remaining pixels	Shift+click
Traverse across selected shape ROI	Tab
Traverse across selected shape ROI in reverse order	Shift+Tab
To move selected shape ROI in the arrow direction in an image frame	Ctrl+Right/Left/Up/Down Arrow
To scale up the selected Rectangle label	Ctrl+=/+
To scale down the selected Rectangle label	Ctrl+-

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

Task	Action
Zoom in or out of frame	Move the scroll wheel up (zoom in) or down (zoom out) The scroll wheel works in Zoom In, Zoom Out, and Label mode but not Pan mode.
Zoom in on specific section of frame	From the app toolstrip, under Modes, select Zoom In. Then, draw a box around the section of the frame you want to zoom in on.

Task

Action

Zoom in or out of frame

Move the scroll wheel up (zoom in) or down (zoom out)

The scroll wheel works in Zoom In, Zoom Out, and Label mode but not Pan mode.

Zoom in on specific section of frame

From the app toolstrip, under Modes, select Zoom In. Then, draw a box around the section of the frame you want to zoom in on.

Zooming and Panning

Task	Action
Zoom in or out of frame	Move the scroll wheel up (zoom in) or down (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 frame	In the upper-right corner of the frame, click the Zoom In button . Then, draw a box around the section of the frame that you want to zoom in on.
Pan across frame	Press the up, down, left, or right arrows

Task

Action

Zoom in or out of frame

Move the scroll wheel up (zoom in) or down (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 frame

In the upper-right corner of the frame, click the Zoom In button

. Then, draw a box around the section of the frame that you want to zoom in on.

Pan across frame

Press the up, down, left, or right arrows

App Sessions

Task	Action
Save current session	Ctrl+S

Label and Sublabel Attribute Panel

Task	Action
Navigate through all elements in the pane from top to bottom, including buttons above the list.	Tab key

View Labels, Sublabels, and Attributes Right-Panel

Task	Action
Accept label	A (when a label is selected)
Reject label	R (when a label is selected)
Navigate through the cells	Left, right, up, and down
Navigate through actionable elements.	Tab
Navigate through actionable elements.	Shift and Tab

Attribute Column: Drop-down Menu

Task	Action
Open drop-down list	Space (with focus on list)
Select an entry in list	Enter (with focus on list)
Browse the entries in the list	Up or Down arrow (afterEnter action)
Select entry	Enter (with focus on list)

Attribute Column: Edit Field

Task	Action
Confirm text content	Enter

Review Status Column: Accept/Reject

Task	Action
Confirm text content by selecting focused radio button.	Space
Move focus to and select the previous or next radio button in the group, and deselect previously focused radio button.	Left and Right