AnnotationContext

The AnnotationContext provides additional information on how to display entities.

Entities can use ClassIds and KeypointIds to provide annotations, and the labels and colors will be looked up in the appropriate AnnotationContext. We use the first annotation context we find in the path-hierarchy when searching up through the ancestors of a given entity path.

Components components

Required: AnnotationContext

Shown in shown-in

API reference links api-reference-links

Examples examples

Rectangles rectangles

 import rerun as rr

rr.init("rerun_example_annotation_context_rects", spawn=True)

# Log an annotation context to assign a label and color to each class
rr.log("/", rr.AnnotationContext([(1, "red", (255, 0, 0)), (2, "green", (0, 255, 0))]), static=True)

# Log a batch of 2 rectangles with different `class_ids`
rr.log("detections", rr.Boxes2D(mins=[[-2, -2], [0, 0]], sizes=[[3, 3], [2, 2]], class_ids=[1, 2]))

Segmentation segmentation

 """Log a segmentation image with annotations."""

import numpy as np
import rerun as rr

rr.init("rerun_example_annotation_context_segmentation", spawn=True)

# Create a simple segmentation image
image = np.zeros((200, 300), dtype=np.uint8)
image[50:100, 50:120] = 1
image[100:180, 130:280] = 2

# Log an annotation context to assign a label and color to each class
rr.log("segmentation", rr.AnnotationContext([(1, "red", (255, 0, 0)), (2, "green", (0, 255, 0))]), static=True)

rr.log("segmentation/image", rr.SegmentationImage(image))

Connections connections

 """Log annotation context with connections between keypoints."""

import rerun as rr
from rerun.datatypes import ClassDescription

rr.init("rerun_example_annotation_context_connections", spawn=True)

rr.log(
    "/",
    rr.AnnotationContext([
        ClassDescription(
            info=0,
            keypoint_annotations=[
                (0, "zero", (255, 0, 0)),
                (1, "one", (0, 255, 0)),
                (2, "two", (0, 0, 255)),
                (3, "three", (255, 255, 0)),
            ],
            keypoint_connections=[(0, 2), (1, 2), (2, 3)],
        )
    ]),
    static=True,
)

rr.log(
    "points",
    rr.Points3D(
        [
            (0, 0, 0),
            (50, 0, 20),
            (100, 100, 30),
            (0, 50, 40),
        ],
        class_ids=[0],
        keypoint_ids=[0, 1, 2, 3],
    ),
)

Rerun