We are still working on writing a simple webapp wrapper for demo purposes.
Changes
Instead of using a breadboard for connecting the opt-in switch and debug LED, we soldered a protoboard so that the dash cam is more compact and installable in a car.
While implementing the wrapper web app, we identified an opportunity to improve how Plate Patrol notifies external services of license plate matches.
Currently, matches are simply logged to the match_log table, “as if” notifying services. However, for true backend-to-backend integration, a more robust, real-time communication mechanism is needed. After evaluating options, we decided to implement webhook notifications, aligning with industry standards for real-time event delivery. To support this, we updated the Watchlist Management APIs (now better described as Webhook Registration APIs) to allow external services to dynamically register and unregister for plate match notifications. This enables third parties (such as dashcam users and security partners) to opt-in and receive instant alerts when plates of interest are detected — without the need for constant polling or manual monitoring.
Testing
Please refer to Apr 12 team status report and Apr 19 Vicky’s status report for the testing we did. The major finding is that doing plate detection and OCR on edge with cloud watchlist query provides best performance results.
