| 摘要 |
<p>The invention relates to a surveillance system 1 to survey a surveillance field X. System 1 has an infra red (IR) camera 10 to capture images of an object (for example, person Y) in a surveillance field, a plurality of infra red (IR) illuminators 21-26 remote from the camera in the surveillance field, and control means 31-36 and 40 to illuminate at least two of the illuminators near (i.e. close, proximate light sources) to an object being captured by camera 10. Each illuminator may illuminate a circle or a segment of the circle around the illuminator, at a time provided by the control means. Exposure time of camera acquisition may be controlled, with time synchronisation (for example by a time base / timing markers) between camera and illuminators. An IR optical band pass filter can be provided in front of the camera. Stereo, 3D imaging is possible.</p> |
