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Heatmap (preview)

The query displays detected objects over time in a heatmap format. This can be used to visualize the density of detections over time.

Heatmap is currently in preview mode. It is not recommended for production use yet, as it may contain bugs and incomplete features.

Multiple object types

Note that Heatmap does not differentiate between object types - create multiple queries if you want to visualize different object types separately.

Prerequisites

Setup

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

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 above:

  • 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.

Object types

Select one or multiple object types you want to search for - Person is selected by default. Select a category, then click the dropdown menu to see the list of available object types for the selected object category.

Object types

  • Minimum confidence: 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.

Add attribute (optional)

Object attributes

Some object types may have additional attributes available for filtering, such as helmet and gender for Person objects. You can select any number of them to further filter your results; For instance, adding the nohelmet attribute to Person objects will filter detections so that only people not wearing helmets will show up in the Query results.

  1. Click the +Attribute button.
  2. Select an attribute from the list.
  3. Tick the checkbox of the respective attribute to toggle filtering - i.e. whether to look for people with helmets or without them.
  4. You can keep adding additional attributes if the object type allows them. Click the X button to remove an attribute.
  • Attribute aggregation type:
    • Logical AND: The query will return results that match all selected attributes.
    • Logical OR: The query will return results that match any of the selected attributes.

ROI (Region of Interest)

Draw a polygon on the video frame to define the area where the objects will be detected. The polygon can be drawn by clicking on the video frame to create points, then clicking the first point to close the polygon.

  • Sampling interval (in seconds, 5 by default): The rate at which the video frames are sampled for analysis. The higher the sampling rate, the more frames are analyzed, which may increase the accuracy of the results but also the processing time.

  • 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.

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.