Help Center/ Video Intelligent Analysis Service/ API Reference/ Alarm Information/ Crowd Density Monitoring
Updated on 2024-02-29 GMT+08:00
View PDF

Crowd Density Monitoring

  • Data streams in JSON format are output to the specified DIS channels or webhook URLs, including structured data and images.
  • Result example:
    {
    "event_type": 524288,
    "task_id": "d1cde51e12eb47aaaafa36c2b4584b5c",
    "stream_id": "test_camera",
    "timestamp": 1527603463,
    "message_id": "E87B6D7C-4FFD-11EA-AD9D-34B354BC6688",
    "image_base64": "/3j24AAQSkZJRgABAQAAAQABAAD/2wBDAAIBAQE...",
    "data": {
        "scene_type": 1,
        "alarm_type": 2,
        "event_set": [{
            "crowd_count": 14,
            "banner_count": 5,
            "polygon": [
                [400, 200],
                [1280, 200],
                [1280, 720],
                [400, 720]
            ]
        }]
    }
}
  • JSON format

    Field

    Type

    Description

    stream_id

    String

    Camera ID

    event_type

    Uint64

    Event type of the output message. The value is fixed to 524288, which is 0x 0000 0000 0008 0000 in hexadecimal format.

    task_id

    String

    Task ID

    timestamp

    Uint64

    Time when the alarm is triggered

    message_id

    String

    Alarm ID in the form of a UUID

    image_base64

    String

    Base64 encoding results of the video image when the alarm is triggered

    data

    Object

    Service input content
  • data parameters

    Field

    Type

    Description

    scene_type

    Int

    Scenario type. The value is fixed to 1.

    alarm_type

    Int

    Alarm type. The value can be 0, 1, or 2. A larger value indicates a more important alarm type. If the value is 0, no alarm is reported, that is, the number of people or the number of banners does not exceed the alarm threshold. If the value is 1, only the number of detected people exceeds the alarm threshold. If the value is 2, the number of people and the number of banners both exceed the threshold.

    event_set

    List<Object>

    Output results list, including the polygonal area of each alarm and the alarm statistics of each region, including the number of people and banners.
  • event_set parameters

    Field

    Type

    Description

    polygon

    List<Object>

    Polygon area, which is formed by points in sequence, for example, [[400, 200], [1280, 200], [1280, 720] [400, 720]].

    The polygon area is the detection area specified by the user.

    crowd_count

    Int

    Number of people in the current region

    banner_count

    Int

    Number of banners in the current region
Parent topic: Alarm Information