Ключевые слова: alertness, area, awareness, barbed, camera, city, clouds, color, colors, connected, contrast, crime, devices, dusk, electronic, environmental, equipment, evening, fence, high, industrial, infrastructure, installation, landscape, life, lines, long, measures, monitoring, networked, nighttime, observation, outdoor, perimeter, power, prevention, protection, public, range, recording, safety, security, shadows, situational, sky, sunset, surveillance, systems, technology, twilight, urban, utilities, vibrant, vigilance, visibility, visual, wire,