Rerun

Objectron

Visualize the Google Research Objectron dataset including camera poses, sparse point-clouds and surfaces characterization.

Objectron example screenshot

Used Rerun types used-rerun-types

Points3D, Boxes3D, Image*, Transform3D, Pinhole

Background background

This example visualizes the Objectron database, a rich collection of object-centric video clips accompanied by AR session metadata. With high-resolution images, object pose, camera pose, point-cloud, and surface plane information available for each sample, the visualization offers a comprehensive view of the object from various angles. Additionally, the dataset provides manually annotated 3D bounding boxes, enabling precise object localization and orientation.

Logging and visualizing with Rerun logging-and-visualizing-with-rerun

The visualizations in this example were created with the following Rerun code:

Timelines timelines

For each processed frame, all data sent to Rerun is associated with the two timelines time and frame_idx.

rr.set_time_sequence("frame", sample.index)
rr.set_time_seconds("time", sample.timestamp)

Video video

Pinhole camera is utilized for achieving a 3D view and camera perspective through the use of the Pinhole and Transform3D archetypes.

rr.log(
        "world/camera",
        rr.Transform3D(translation=translation, rotation=rr.Quaternion(xyzw=rot.as_quat())),
)
rr.log(
    "world/camera",
    rr.Pinhole(
        resolution=[w, h],
        image_from_camera=intrinsics,
        camera_xyz=rr.ViewCoordinates.RDF,
    ),
)

The input video is logged as a sequence of ImageEncoded objects to the world/camera entity.

rr.log("world/camera", rr.ImageEncoded(path=sample.image_path))

Sparse point clouds sparse-point-clouds

Sparse point clouds from ARFrame are logged as Points3D archetype to the world/points entity.

rr.log("world/points", rr.Points3D(positions, colors=[255, 255, 255, 255]))

Annotated bounding boxes annotated-bounding-boxes

Bounding boxes annotated from ARFrame are logged as Boxes3D, containing details such as object position, sizes, center and rotation.

rr.log(
    f"world/annotations/box-{bbox.id}",
    rr.Boxes3D(
        half_sizes=0.5 * np.array(bbox.scale),
        centers=bbox.translation,
        rotations=rr.Quaternion(xyzw=rot.as_quat()),
        colors=[160, 230, 130, 255],
        labels=bbox.category,
    ),
    timeless=True,
)

Setting up the default blueprint setting-up-the-default-blueprint

The default blueprint is configured with the following code:

blueprint = rrb.Horizontal(
    rrb.Spatial3DView(origin="/world", name="World"),
    rrb.Spatial2DView(origin="/world/camera", name="Camera", contents=["/world/**"]),
)

In particular, we want to reproject the points and the 3D annotation box in the 2D camera view corresponding to the pinhole logged at "/world/camera". This is achieved by setting the view's contents to the entire "/world/**" subtree, which include both the pinhole transform and the image data, as well as the point cloud and the 3D annotation box.

Run the code run-the-code

To run this example, make sure you have Python version at least 3.9, the Rerun repository checked out and the latest SDK installed:

pip install --upgrade rerun-sdk  # install the latest Rerun SDK
git clone git@github.com:rerun-io/rerun.git  # Clone the repository
cd rerun
git checkout latest  # Check out the commit matching the latest SDK release

Install the necessary libraries specified in the requirements file:

pip install -e examples/python/objectron

To experiment with the provided example, simply execute the main Python script:

python -m objectron # run the example

You can specify the objectron recording:

python -m objectron --recording {bike,book,bottle,camera,cereal_box,chair,cup,laptop,shoe}

If you wish to customize it, explore additional features, or save it use the CLI with the --help option for guidance:

python -m objectron --help
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