Illumination Criteria in Imaging System Design for Security Applications

摘要

Of paramount importance in the design of an effective imaging system for security applications, such as perimeter and area surveillance, is the establishment of artificial illumination criteria which are compatible with the requirements of both the imaging cameras and human observers. The 'American National Standard Practice for Protective Lighting,' ANSI A85.1-1956(R 1970), lists requirements for the illumination of boundaries. These requirements apply to direct visual observation by guards. In television viewing, the much reduced dynamic range of the sensor relative to the human eye and camera responsiveness introduce a new problem. The MITRE Corporation has developed a set of criteria for perimeter lighting in an Imaging System. The requirements express the minimum maintained average illumination within the lighted strip and the maximum variation of the minimum level at any point on the ground from the average level. A prototype imaging/illumination system was developed and tested which incorporates high pressure sodium vapor lamps, roadway luminaires and silicon diode array television cameras. Tests were conducted in an operational environment. (Author)