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Enable and retrieve object snapshots

This guide shows how to enable, configure and decode object snapshots for the Best Snapshot feature for the fusion tracker module. If enabled and configured correctly, object snapshots will be send both in the Fusion Tracker and Track Summary modules output.

Prerequisites​

Overview​

The guide contains the following steps:

  1. Enable Best Snapshot feature
  2. Read and decode images
  3. Disable Best Snapshot feature (Optional)

Lets get started!

Step 1: Enable Best Snapshot feature​

The Best Snapshot feature is enabled by sending the following command to the device:

Don't forget to replace <device-ip>, <user> and <password> where applicable.

Enable Best Snapshot
curl --anyauth --user <user>:<password> \
    "http://<device-ip>/config/rest/best-snapshot/v1/enabled" \
    -H "Content-Type: application/json" -X PUT --data "{\"data\":true}"
Output
{
  "status": "success"
}

Or use the Swagger UI to set the /best-snapshot/v1/enabled to true:

http://<device-ip>/config/web-ui/swagger-ui/?url=/config/discover/apis/best-snapshot/v1/openapi.json#/best-snapshot.v1/patch_best_snapshot_v1_enabled

Step 2: Read and decode images​

Reading the data can be done either via MQTT or RTSP. Once you have some data, for example (some data has been removed to keep example small)

Example data
{
  "frame": {
    "timestamp": "2025-01-01T00:00:00.000000Z",
    "observations": [
      {
        "track_id": "1",
        "bounding_box": {
          "bottom": 0.89332,
          "left": 0.13332,
          "right": 0.80004,
          "top": 0.59942
        },
        "class": {
          "type": "Human",
          "score": 0.6
        },
        "image": {
          "data": "<base-64 encoded image>",
          "bounding_box": {
            "bottom": 0.937405,
            "left": 0.033312,
            "right": 0.900048,
            "top": 0.555335
          }
        }
      }
     ]
  }
}

To decode and display the image in python we can do the following:

Decode in Python
import base64
from PIL import Image
from io import BytesIO

image_data = base64.b64decode("<base-64 encoded image>")

image = Image.open(BytesIO(image_data))
image.show()

Step 3: Disable Best Snapshot feature (Optional)​

The Best Snapshot feature is enabled by sending the following command to the device:

Don't forget to replace <device-ip>, <user> and <password> where applicable.

Enable Best Snapshot
curl --anyauth --user <user>:<password> \
    "http://<device-ip>/config/rest/best-snapshot/v1/enabled" \
    -H "Content-Type: application/json" -X PUT --data "{\"data\":false}"
Output
{
  "status": "success"
}

Or use the Swagger UI to set the /best-snapshot/v1/enabled to false:

http://<device-ip>/config/web-ui/swagger-ui/?url=/config/discover/apis/best-snapshot/v1/openapi.json#/best-snapshot.v1/patch_best_snapshot_v1_enabled
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