Automatic License Plate Recognition (ALPR)

Overview#

The ALPR module manages automatic license plate recognition read records from camera systems and provides vehicle watchlist administration. It captures detected plates with confidence scores, GPS coordinates, and optional watchlist matching, enabling organizations to conduct targeted vehicle tracking and surveillance operations with full audit logging.

Key Features#

• Plate Read Records - Capture and store detected license plates with confidence scores, GPS coordinates, timestamps, vehicle type, and vehicle color from camera systems.
• Watchlist Matching - Automatically match detected plates against configured vehicle watchlists for real-time alerts on vehicles of interest.
• Vehicle Watchlist Management - Create and manage vehicle watchlists with different list types, descriptions, and optional expiration dates using create-or-update semantics.
• Audit Logging - All watchlist modifications are automatically logged through the Operations Log service with user identity, operation type, and metadata.
• Row-Level Access Control - Queries are filtered by organization and access control policies to ensure data isolation and security.
• Soft Deletes - Watchlists are deactivated rather than permanently deleted, preserving historical records for compliance and audit purposes.
• Paginated Queries - Plate read queries support pagination with configurable limits for efficient data retrieval.
• Programmable API Access - Full API support for querying plate reads, managing watchlists, and filtering by plate number.

Use Cases#

• Vehicle Surveillance - Monitor specific vehicles of interest by adding their plates to watchlists and receiving automatic notifications when they are detected by camera systems.
• Traffic Analysis - Analyze plate read patterns across camera networks to understand vehicle movement and identify routes or patterns of interest.
• Investigations - Cross-reference plate detections with case data to place vehicles at specific locations and times during criminal investigations.
• Compliance Monitoring - Track vehicle movements for regulatory compliance, with full audit trails and historical watchlist records.

Integration#

The ALPR module integrates with other Argus modules:

• Operations Log - All watchlist mutations are automatically recorded in the operations log for audit compliance.
• Alert Management - Watchlist matches can trigger alerts for real-time notification of detected vehicles of interest.
• Case Management - Plate read data and watchlist matches can be linked to investigation cases as evidence.
• Command Center - Live plate detection feeds and watchlist hit notifications display in the operational command center.

Last Reviewed: 2026-02-24