Ключевые слова: audience, audiovisual, background, beam, business, cinema, classroom, closeup, color, conference, demonstration, device, digital, entertainment, equipment, film, glowing, hall, illumination, indoors, lamp, lcd, lecture, lens, light, media, meeting, modern, movie, multimedia, nobody, object, office, presentation, projection, projector, room, show, slide, system, table, technology, video, visual, watching,