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【正文】 thing pro AV has to an international standard for videoconferencing lighting design.Source: PRO AV MagazinePublication date: December 1, 2005By Tim Cape, CTSDWhile the ultimate goal in videoconferencing is good interactivity between near and farend rooms, one mon lighting design problem can be summed up in a question that39。s remained constant throughout the evolution of videoconferencing technology: How can you provide good, fortable lighting to optimize the camera and video codec operation in an architectural environment rather than in a studio? Although it39。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 haven39。s specifically oriented toward small to midsized videoconferencing rooms with a single camera axis (from displays to seated participants). It doesn39。s not just about the luminaires that emit the light, it39。ll encounter in a lighting design project. While the AV designer may be qualified to be the lighting designer in some cases, it39。s expressed in lux (lumens per square meter — the preferred unit of measure) or footcandles (fc, lumens per square foot — the more obsolete unit). One footcandle equals lux. It39。s expressed as candelas per square meter (footlamberts in the more obsolete English units).Luminaire refers to a plete lighting assembly including the housing, reflectors, and lamps. Only when it39。t as practical. Instead, the concept of background lighting is used as defined below:Key light is lighting from the side or above at an angle of approximately 45 degrees that creates the primary light source for the participants. This light is normally the brightest source and creates shadows on the faces to help with definition of facial features.Fill light is the light that is intended to fill in the shadows created by the key light. Without adequate fill light, shadows under the eyes, nose, and chin can appear as solid black on camera due to the camera39。s field of view, most notably lighting the videoconference room39。t an acceptable option.Fortunately, there are many solutions. Several lighting manufacturers offer luminaires designed specifically for videoconferencing, most typically for providing good key lighting while providing good directionality to keep light off of the display area at the front of the room. There are many luminaires that provide good, even coverage of a wall without throwing light out away from the wall (often called “wall washers”). Standard luminaires that are designed for typical office areas can be used if the key, fill, and background lighting elements are addressed, but sometimes this involves a more creative solution in coordination with the architecture and interior design.The basic criteria Starting the design approac
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