Optoelectronic and Environmental Factors Affecting the Accuracy of Crowd-Sourced Vehicle-Mounted License Plate Recognition
| Autor: | A. Barnard, Marthinus J. Booysen, M. C. Rademeyer |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Computer science
ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Crowdsourcing operating conditions optical specifications law enforcement Focal length Image sensor License Orientation (computer vision) business.industry Mechanical Engineering Scale (chemistry) lcsh:TA1001-1280 developing countries lcsh:HE1-9990 number plate recognition Computer Science Applications Automotive Engineering Traffic conditions Optoelectronics lcsh:Transportation engineering lcsh:Transportation and communications business Focus (optics) |
| Zdroj: | IEEE Open Journal of Intelligent Transportation Systems, Vol 1, Pp 15-28 (2020) |
| ISSN: | 2687-7813 |
| DOI: | 10.1109/ojits.2020.2991402 |
| Popis: | License plate recognition (LPR) technology has been used to combat vehicle-related crime in urban areas in many developed contexts. However, commercially available LPR systems are expensive and not feasible for large scale adoption in developing countries. The development of a low-cost crowd-sourced solution requires an informed approach to the selection of an appropriate camera, as well as a realistic understanding of the system's performance under various environmental conditions. This work investigates the effect of optoelectronic and environmental factors on the ability of a vehicle-mounted LPR system to correctly identify license plates, specifically for a mass-deployment crowd-sourced scenario. A theoretical LPR camera model was developed to estimate the effect of different cameras, while the effects of motion, orientation and lighting were evaluated in a series of experimental tests. The most influential optoelectronic factors were shown to be focus, focal length and image sensor resolution. Furthermore, recognition was impaired during high-speed turn maneuvers, angling of license plates away from the camera and certain night-time conditions. The optoelectronic model proved useful for the selection of a cost-effective camera for use in an open-source LPR system. Moreover, the study of environmental factors provided valuable insight into the limitations of LPR systems in various environmental and traffic conditions. |
| Databáze: | OpenAIRE |
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