题名: |
DEPLOYMENT OF AUTOMATED LICENSE PLATE READING SYSTEMS FOR TRAFFIC MANAGEMENT, HIGHWAY SAFETY AND AREA SECURITY. |
作者: |
Shuldiner-Paul-W; Woodson-Jeffrey-B |
关键词: |
image-processing; license-plates; optical-scanners |
摘要: |
A machine vision system capable of automatically processing license plate images from videotape or live video is described. A special feature of this system identifies the presence of a license plate anywhere in the field of view and captures this license plate image for subsequent processing and transcription to a computer file using optical character recognition techniques. The captured video license plate image can also be presented to a human operator for manual transcription. The video/machine vision system functions equally well with overhead views of traffic, such as from highway overpasses, and with roadside views from highway shoulders and medians. It operates effectively at all highway speeds without supplemental lighting under most weather conditions during daylight hours and, with supplemental lighting, at night. The self-triggering plate capture feature obviates the need for external triggers such as treadles or light beams to signal the presence of a vehicle in a given video frame. As such, the system is mobile and extremely flexible and is well suited both for collecting data at multiple sites for a one or two day period and for semi-permanent or permanent installations. |
总页数: |
ITS America. Meeting (7th : 1997 : Washington, D.C..). Merging the transportation and communications revolutions : conference proceedings. 1997. pp8 |
报告类型: |
科技报告 |