Ключевые слова: audience, audiovisual, background, blur, blurred, business, classroom, closeup, communication, conference, congress, corporate, crowd, demonstration, digital, discussion, education, entertainment, equipment, event, female, group, hall, interior, learning, lecture, lens, light, listening, meeting, modern, multimedia, people, presentation, presenting, projection, projector, room, seminar, slide, students, table, technology, training, unrecognazible, video, visual, white, young,