Innovative Real-Time High-Speed ANPR System with Basler ace
Automatic number plate recognition (ANPR), also known as license plate recognition (LPR), for fast-moving vehicles has always been a challenging task, especially when using an IP camera-based traffic monitoring system. In many cases, this is due to basic, low-end sensors typically used in IP cameras with very limited sensitivity, resulting in long exposure times and therefore blurred images. Furthermore, video compression reduces the image information and leads to compression artefacts which decrease the capture rate of highly detailed car license plates significantly. With increasing numbers of traffic violations raising safety concerns, Singapore was looking for a better solution.
That is why Basler’s customer Optasia Systems developed a real-time, high-speed ANPR system using Basler ace cameras with Sony’s IMX249 CMOS sensor. The system software called Optasia IMPSTM Video Analytics LPR was programmed with Basler’s pylon SDK. The IMX249’s high dynamic range allows the camera to operate efficiently in the difficult light conditions and captures images using a technique known as exposure bracketing.
Our Success Story describes in detail how the images are captured, cropped and processed for number plate recognition.