Ключевые слова: audience, audiovisual, background, business, classroom, closeup, color, conference, corporate, demonstration, device, digital, discussion, education, entertainment, equipment, hall, indoors, lamp, lcd, learning, lecture, lens, lesson, light, media, meeting, modern, movie, multimedia, nobody, object, office, prepared, presentation, projector, room, seminar, show, slide, system, table, technology, training, video, visual, watching, work,