Starting Pass Detector

Reads tracks of the detected persons from a JSON topic, and detects crosses on predefined passlines.

Prerequisites

It is assumed that Multi-Graph Runner (MGR) and Tracker is running, because tracking records are necessary input. For more information on running MGR and Tracker, see Starting Multi-Graph Runner and Starting Tracker.

Path of the configuration file:

"${UVAP_HOME}"/config/uvap_kafka_passdet/uvap_kafka_passdet.properties

By default, the configuration contains two perpendicular passlines in the middle of the image, optimized for resolution 1920x1080.

Set different coordinates of passlines by changing the configuration. For more information on Pass Detector configuration, see Configuring Pass Detector.

Required input topic:

<prefix>.cam.0.tracks.TrackChangeRecord.json

Note: Not available for multiple input streams. This microservice can only process one input.

Starting the Pass Detector service

To start Pass Detector:

  1. Run the microservice:

    Attention! Before starting this microservice, the command below silently stops and removes the Docker container named uvap_kafka_passdet, if such already exists.

    $ "${UVAP_HOME}"/scripts/run_kafka_passdet.sh -- --net=uvap

    The output of the above command contains the following:

    • Information about pulling the required Docker image
    • The ID of the Docker container created
    • The name of the Docker container created: uvap_kafka_passdet

    There are more optional parameters for the run_kafka_passdet.sh script to override defaults. Use the --help parameter to get more details.

  2. Wait for approximately 30 seconds, then check if the containers are still running:

    $ docker container inspect --format '{{.State.Status}}' uvap_kafka_passdet

    Expected output:

    running

  3. Check the output:

    $ docker exec kafka kafka-console-consumer --bootstrap-server kafka:9092 \
  --topic base.cam.0.passdet.PassDetectionRecord.json

    Expected example output:

    {"type":"HEARTBEAT"}
{"type":"HEARTBEAT"}
{"type":"HEARTBEAT"}
{"type":"HEARTBEAT"}
{"type":"HEARTBEAT"}
{"type":"HEARTBEAT"}
{"type":"HEARTBEAT"}
{"type":"HEARTBEAT"}
{"type":"PASS_CANDIDATE","pass_candidate":{"pass":{"id":{"track_key":"1566822226487_2826","serial":0},"pass_line_id":"y","cross_dir":"RL","section_idx":0,"cross_point":{"x":960,"y":103}},"is_extrapolated":false}}
{"type":"HEARTBEAT"}
{"type":"PASS_CANDIDATE","pass_candidate":{"pass":{"id":{"track_key":"1566822226487_2826","serial":1},"pass_line_id":"y","cross_dir":"LR","section_idx":0,"cross_point":{"x":960,"y":227}},"is_extrapolated":false}}
{"type":"HEARTBEAT"}
{"type":"HEARTBEAT"}
{"type":"END_OF_TRACK","end_of_track":{"track_key":"1566822226487_2826"}}
{"type":"HEARTBEAT"}
{"type":"END_OF_TRACK","end_of_track":{"track_key":"1566822246986_2828"}}
{"type":"END_OF_TRACK","end_of_track":{"track_key":"1566822247352_2829"}}
{"type":"HEARTBEAT"}
{"type":"HEARTBEAT"}
{"type":"HEARTBEAT"}
{"type":"HEARTBEAT"}

The following output topic is created:

<prefix>.cam.0.passdet.PassDetectionRecord.json
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