Peak Crowd Counting

Data streams in JSON format are output to the specified DIS channels, including structured data and images.

Result example when the value of grid_x_number or grid_y_number is 0 (classic ROI settings):

{
    "event_type": 1769472,
    "task_id": "taskcgtiad41",
    "stream_id": "test_camera",
    "timestamp": 1527603463,
    "message_id": "E87B6D7C-4FFD-11EA-AD9D-34B354BC6688",
    "image_base64": "/3j24AAQSkZJRgABAQAAAQABAAD/2wBDAAIBAQE...",
    "data": {
        "scene_type": 1,
        "alarm_type": 1,
        "total_crowd_count": 14,
        "event_set": [{
            "crowd_count": 14,
            "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 1769472, which is 0x 0000 0000 001B 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 or 1. If the value is 0, no alarm is reported, that is, the number of people does not exceed the alarm threshold. If the value is 1, only the number of detected people exceeds the alarm threshold.
total_crowd_count	Uint64	Total number of people in all ROIs
event_set	List<Object>	Output results list, including the polygonal area of each alarm and the alarm statistics of each region

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

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

Result example when the value of grid_x_number and grid_y_number is greater than 0, while target_roi is set to the lower right corner of the image:

{
    "event_type": 1769472,
    "task_id": "taskcgtiad41",
    "stream_id": "test_camera",
    "timestamp": 1527603463,
    "message_id": "E87B6D7C-4FFD-11EA-AD9D-34B354BC6688",
    "image_base64": "/3j24AAQSkZJRgABAQAAAQABAAD/2wBDAAIBAQE...",
    "data": {
        "scene_type": 1,
        "alarm_type": 1,
        "total_crowd_count": 14,
        "grid_width": 400, 
        "grid_height": 180, 
        "event_set": [{
            "grid_crowd_count": [
		 [-1, -1, -1, -1, -1, -1, -1, -1, -1, -1],
		 [-1, -1, -1, -1, -1, -1, -1, -1, -1, -1],
		 [-1, -1, -1, -1, -1, -1, -1, -1, -1, -1],
		 [-1,  0,  0,  4,  7,  8,  6,  4,  3,  4],
		 [-1,  7,  3,  7,  5,  8,  3,  3,  1,  2],
		 [-1,  6,  0,  6,  8,  7,  5,  2,  0,  6],
		 [-1,  5,  6,  0,  0,  8,  8,  6,  7,  2],
		 [-1,  4,  2,  8,  9,  1,  7,  5,  3,  5],
		 [-1,  0,  1,  8,  4,  3,  1,  6,  2,  3],
		 [-1,  3,  8,  0,  4,  5,  3,  3,  6,  3]
	   ]
        }]
    }
}

JSON format

Field	Type	Description
stream_id	String	Camera ID
event_type	Uint64	Event type of the output message. The value is fixed to 1769472, which is 0x 0000 0000 001B 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 or 1. If the value is 0, no alarm is reported, that is, the number of people does not exceed the alarm threshold. If the value is 1, only the number of detected people exceeds the alarm threshold.
total_crowd_count	Uint64	Total number of people in all ROIs
grid_width	Int	Video frame width/Number of horizontal grids. The value is rounded down.
grid_height	Int	Video frame height/Number of vertical grids. The value is rounded up.
event_set	List<Object>	Output results list, including the head counting result of each grid

event_set parameters

Field	Type	Description
grid_crowd_count	List<Object>	Number of people in each grid. The grid sequence is from left to right and from top to bottom. The value -1 indicates that the grid is outside the target_roi area.