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Системы видеонаблюдения и контроля доступа, охранно-пожарная сигнализация, системы оповещения.

 

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          Системы видеонаблюдения – это комплекс оборудования и программ (камеры видеонаблюдения, мониторы, объективы, видеорегистраторы и пр. видеооборудование), которое используют для организации охранного видеонаблюдения на объектах, незавимисо от их территориального месторасположения.

          Объективы видеонаблюдение

                         Объективы Vidatec

                         Объективы Samsung

                         Объективы Panasonic

          Любая видеокамера имеет объектив. Это оптическое устройство, фокусирующее световой поток на ПЗС-матрице видеокамеры. Объективы бывают встроенные в видеокамеру, регулируемые, управляемые и т.п. Самый важный параметр объектива – расстояние, измеряется в мм (миллиметры). Чем больше фокусное расстояние, тем уже угол обзора видеокамеры, но тем дальше она видит. Если нужно просматривать небольшую комнату, достаточно взять объектив с f=3.5 мм (угол составит около 80 гр., в зависимости от размера ПЗС), при наблюдении за периметром, протяженностью 100м нужно f=10-12мм и т.д. Одним словом, нельзя одной стандартной камере видеонаблюдения иметь одновременно широкий угол и хорошую дальность обзора. Исключение составляют видеокамеры с мегапиксельной матрицей, но применение их ограничено из-за высокой цены.

          Существуют объективы, фокусное расстояние которых может дистанционно меняться оператором, подобно как на бытовых видеокамерах и фотоаппаратах. Такие объективы называются трансфокаторами. Они позволяют визуально удалять или приближать объекты перед камерой. Их недостаток выплывает из их достоинства – зачастую оператор, наблюдая за каким-либо объектом, приближает его, а затем забывает возвратить объектив в исходное положение и угол обзора камеры остается слишком узким для решения поставленных перед ней задач. Поэтому видеокамеры с трансфокаторами используют для наблюдения за динамическими объектами, помимо камер с объективами с фиксированным фокусным расстоянием.
          Еще один важный параметр объектива – наличие АРД (автоматически регулируемой диафрагмы). Это устройство, позволяющее контролировать яркость светового потока и не допускать засветки изображения при ярком освещении. Если видеокамера монтируется на улице желательно применять объектив с АРД.

          Объективы с фиксированным фокусным расстоянием, как правило, позволяют создать изображение более высокого качества, чем Zoom-объективы того же ценового диапазона.