Upload, view, and overlay images

See the View and navigate in the 3D interface page for basic 3D navigation principles.

Upload images along with point clouds allows you to upload images along with point clouds. Additionally, you can also specify the camera calibration parameters, which allows you to view the 3D point cloud and objects on the image. See Camera image for information on how to add camera images and calibration parameters to a sample.

Open/close the image viewer

When you open a sample with images, you can see the thumbnails of the images at the bottom of the main labeling window.
  • To open the image viewer, click on the thumbnail of the image.
  • To close the image viewer, click "Close camera view".
The 3D overlay (of objects and the point cloud) is only visible if the camera parameters of the image are specified.

Zoom/pan in the image viewer

Zoom in/out

To zoom in or out, scroll using the mouse wheel, or double-click in the viewer.


Hold the panning hotkey (Ctrl/cmd by default) and click and drag.

Toggle the point cloud overlay

To toggle the point cloud overlay on and off, press the hotkey (Ctrl/cmd + q by default) or click on the point cloud overlay icon in the toolbar on the right. Disabling the point cloud overlay allows you to see the camera image in more detail, while enabling it allows you to see if the camera and lidar are well calibrated.

Use the synchronized image viewer

When one or more calibrated images are available, a synchronized image viewer appears in the bottom right of the screen. When hovering in the perspective or top view this viewer automatically zooms to the location of the pointer in the closest camera image.

View the active cuboid camera images in the synchronized viewer

When a cuboid is selected, the synchronized image viewer shows the active cuboid in every camera image where it appears.
To switch between the camera images, press the arrows on the left/right of the synchronized image viewer, or press a rectangle at the bottom of the synchronized image viewer.
You can also zoom/pan in the synchronized image viewer in the same way as in the image viewer (see above).

View the image grid

When adding images to a sample, you have to specify a row and column for each image. This information is used to display a grid of your images. You can either view this grid in the main labeling window, or in a separate browser tab (which you could move to a second screen).
  • Toggle the synced images in the interface by clicking on the image icon in the right toolbar, or by pressing the hotkey (q by default).
  • Display the synced images in a separate tab by holding Ctrl/Cmd and clicking the image icon in the right toolbar, or by right-clicking the image icon and click "Open in new tab" or "Open in new window".
You can interact with the images in the grid as follows:
  • To zoom in/out on an image, scroll using the mousewheel or double-click on the image.
  • To pan an image, click and drag on the image.
  • To open the image viewer in the main labeling window, click the camera icon in the top right corner of the image.