视频会议室灯光设计简介(英文版)(doc 8页)

视频会议室灯光设计简介内容提要：
Source: PRO AV Magazine
Publication date: December 1, 2005
By Tim Cape, CTS-D
While the ultimate goal in videoconferencing is good interactivity between near- and far-end rooms, one common lighting design problem can be summed up in a question that's remained constant throughout the evolution of videoconferencing technology: How can you provide good, comfortable lighting to optimize the camera and video codec operation in an architectural environment rather than in a studio? Although it's a fairly simple question, the answer can be quite complicated.
There must be some light in the room of the space you're designing just for the camera to produce an image, but making that image look good while maintaining a good projected video image can be easier said than done. On top of just getting the camera to produce a decent image, you also have to be concerned about what the codec will do to that image (particularly at low bit rates), putting more constraints on not just the lighting design but also the interior design of the room itself — once again going beyond the tenets of a basic AV system.
Up until now, AV professionals haven't had much consistent guidance on videoconferencing room lighting design, but the new design guide, offered by the Illuminating Engineering Society of North America (IESNA), gives them an authoritative place to start.
The new design guide
In development since 2002, the “Videoconferencing Lighting Design Guide,” DG-17-05, is now available for purchase through the IESNA website (www.iesna.org). It includes a wide range of recommended criteria and general recommendations for approaches to lighting for videoconferencing facilities. It's specifically oriented toward small- to mid-sized videoconferencing rooms with a single camera axis (from displays to seated participants). It doesn't specifically cover dual-axis rooms that include a presenter near the displays or larger facilities, though much of the criteria can be applied to this wider range of rooms.
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