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Near Miss Detection

The Near Miss query detects if a moving object comes close to a Person. The maximum time and space between the two objects to trigger an alert is configurable.

Tipical use case is detecting if a car comes close to a pedestrian, almost resulting in collision.

Prerequisites

Setup

  1. Select a video from your workspace Click +Set up New Query.

  2. Select Near Miss Detection from the list of query types.

1. Query Name

Give your query a name to better identify it. A description can also be added (optional).

2. Object Detection Filter (1st object type)

The filter used to detect objects in the scene, Person by default.

Videos

The thumbnail image of the previously chosen video is displayed here.

Time interval

Time interval

Select a time frame for the analytics to run, depending on the type of video selected:

  • Earliest: Run the query from the time shown (set during video registration as the beginning timestamp of the video).
  • Latest: Run the query until the time shown (set during video registration as the end timestamp of the video).
  • Given Date: You can select a custom start and end date and time to run the query on. Type the desired date and time or select them by clicking the calendar icon.
  • Live: Analysis is run live, continously.
  • Interval: You can select a custom start and end date and time to run the query on. Type the desired date and time or select them by clicking the calendar icon.
  • Set interval to: Choose from the presets below to run the query on a given time inmterval.
  • Minimum confidence (0.5 by default): The minimum confidence level required for an object to be detected. The higher the confidence level, the more certain the system is that the object is of the selected type. The confidence level ranges from 0 to 1, with 1 being the highest confidence level.

ROI (Region of Interest)

Draw a region of interest (ROI) on the video frame. The query will trigger an alert only for objects present in the zone, otherwise the entire video frame will be used.

Left-click on the video frame to draw a polygon. Left-click again on the video frame to keep adding points to the polygon; double-click to finish drawing.

  • Sampling interval (in seconds, 5 by default): The rate at which tracks get sampled.

  • Maximum number of parallel tracks at the same time (50 by default): The maximum number of tracks that can be processed at the same time.

3. Object detection filter (2nd object type)

The filter used for detecting moving objects - Bus, Car and Truck by default - that come close to objects of the 1st type, configured above. The minimum amount of movement needed for detection is configurable.

Tip

By default, Near Miss is configured to detect Person objects and vehicles - Bus, Car and Truck - that come close to Person objects. This can be changed however, even reversed, to e.g. detect if a moving Person comes close to a stationary vehicle.

Object types

Object types

Select one or multiple object types you want to search for - Bus, Car and Truck are selected by default. Click the dropdown menu to see the list of available object types for the selected object category.

  • Minimum confidence (0.5 by default): The minimum confidence level required for an object to be detected. The higher the confidence level, the more certain the system is that the object is of the selected type. The confidence level ranges from 0 to 1, with 1 being the highest confidence level.

  • Sampling interval (in seconds, 1 by default): The rate at which tracks get sampled.

  • Minimum movement (in percentages, 5 by default): The minimum amount the object needs to move to be considered as moving, relative to its size.

  • Maximum number of parallel tracks at the same time (50 by default): The maximum number of tracks that can be processed simultaneously. Increasing this number may improve the accuracy of the results but also the processing time.

4. Space join

Configure the maximum time and space between the two objects needed to trigger an alert.

  • Maximum time difference (in milliseconds, 1000 by default): The maximum time difference between the objects. If the time difference between the two objects appearing is less than equal then the value set here, the query will trigger an alert.

  • Max relative distance (in ratio, 1 by default): The maximum distance between the objects to trigger an alert. The distance is calculated as a ratio of the width of the larger object.

Ratio calculation

The ratio equals the width of the larger object multiplied by the value set here.

For example: if the width of the larger object is 100 pixels and the value set here is 1, the maximum distance between the two objects is 100 pixels.

5. Alarm Integrations (optional)

The query can optionally be integrated with third-party systems, such as Milestone XProtect or a webhook to trigger alarms.

  • Cooldown (in seconds, 10 by default): The minimum time between two alerts sent to the chosen integration.

Milestone XProtect Analytics Event Integration

The query can be configured to send detections to Milestone XProtect, appearing as Analytics Events.

  • Milestone XProtect host address: The IP address of the Milestone XProtect server.
  • Analytics event name: The name of the Milestone XProtect Analytics Event that triggers the query.
  • Event display name: The display name of the event that will be shown in the event list.
  • Description: The description of the event that will be shown in the event list.
  • Timestamp offset (in seconds): The time offset between the Milestone XProtect Analytics Event and the query trigger.

Webhook

The query can be configured to send detections to a Webhook URL.

  • URL: The URL of the Webhook.
  • Custom header key: The key of the custom header.
  • Custom header value: The value of the custom header.

Results

All done - Clicking Save & Run will immediately start the analysis and opens the Result screen of this query. Alternatively, clicking Save & Exit saves the query without running it.