Architecture#
The CARS_Stream architecture (Figure 1).
A detailed description subsystem components is given in Table 2.
Table 2. Description of CARS_Stream components
| Component | Description |
|---|---|
| Source | Video file or RTSP stream containing areas with vehicle, LP, smoke, fire, pedestrian, animal on the frame |
| Load balancer | A service for distributing requests and responses between several running copies of CARS_Stream and an external analytics system |
| CARS_Stream Server | Service for interaction with external systems and processing of incoming video streams and video files - converts them into a sequence of frames for subsequent detection and tracking of the position of the object and determine the best frame |
| Track Engine | A library containing a set of algorithms for detecting, tracking the position and determining the best frames of the objects |
| External analytics system | An external system that allows aggregating information about the position of the object. Currently, only CARS_Analytics is supported |
CARS_Stream operation sequence diagram#
Sequence diagram of processing input data and selecting the best frame (Figure 2).
A detailed description of the diagram is given in Table 3.
Table 3. Sequence diagram description
| № | Description |
|---|---|
| (1) | Video files or RTSP streams are sent to CARS_Stream Server from source |
| (2) | CARS_Stream Server divides video into frames |
| (3) | CARS_Stream Server sends a request to the Track Engine for frame processing |
| (4) | Track Engine detects objects on the frame, generates an object track, determines the start track shot and best shots of object’s track |
| (5) | The Track Engine returns to the CARS_Stream Server information about the position of the object, the object track, start track shot and the best shot |
| (6) | CARS_Stream Server sends a request with the best frames and information about the position of the object to an external system for subsequent retrieval of the object’s attributes |