CCTV

Mengenal Digital Zoom dan Optical Zoom Beberapa kamera digital, khususnya yang point and shoot maupun yang prosumer memiliki dua fasilitas, yaitu optical zoom dan digital zoom. Zoom optical bekerja seperti lensa zoom pada kamera film. Perubahan perbesaran terletak pada titik api lensa, sehingga subjek yang didekatkan akan tampak lebih besar tanpa berkurang kualitas gambarnya. Sedangkan zoom digital hanya melakukan pemotongan gambar menjadi ukuran yang lebih kecil, kemudian memperbesar bagian yang dipotong tersebut untuk mengisi seluruh frame (bingkai) sebagaimana diinginkan. Dengan kata lain, zoom digital menyebabkan kualitas menjadi sangat menurun dari gambar asli. Pixel yang tampak akan terkesan kasar dan tidak halus, seperti contoh gambar berikut ini. Pentingkah Digital Zoom? Apabila Anda telah terbiasa mengggunakan kamera SLR analog film, kemungkinan besar Anda akan menghindari digital zoom. Digital zoom bukanlah zoom yang sesungguhnya, karena ha...

Memahami Kecepatan Shutter Kamera baik yang digital maupun analog, pada dasarnya memiliki fungsi yang serupa atau memiliki fungsi-fungsi umum. Fungsi-fungsi dasar kamera tersebut antara lain kecepatan rana (shutter), diagframa lensa, mode pencahayaan, optical dan digital zoom, kecepatan ISO, dan kompensasi pencahayaan. Keberadaan shutter atau pelepas rana kamera sangat terkait erat dengan diagframa lensa. Pengaturan yang dilakukan di shutter akan berpengaruh pada diagframa lensa kamera, begitu juga sebaliknya. Shutter atau pelepas rana pada kebanyakan kamera SLR (analog maupun digital) adalah tirai yang bergerak horizontal atau vertikal yang terletak berdekatan dengan tempat film (pada kamera analog), atau di antara lensa dan body kamera (pada kamera digital SLR). Tetapi tentu saja hal itu berbeda pada kamera point and shoot atau prosumer. Meskipun prinsipnya tetap sama. Pada kamera yang dapat diatur manual atau dengan prioritas pengaturan rana, Anda dapat mengatur kece...

Mencoba Kamera sebelum Membeli Kamera digital hampir sama dengan digital media lainnya, biasanya dilengkapi dengan menu dan tombol-tombol pengontrol untuk disesuaikan dengan keperluan kita. Beberapa kamera memiliki perintah yang mudah dimengerti dibanding jenis lainnya. Perbandingan mudah atau susah dapat Anda simpulkan jika sudah mencobanya. Perhatikan juga time delay, dari mulai kita tekan tombol shoot sampai gambar selesai diambil (shutter lag). Ada kamera tertentu yang delay-nya sangat lama, tetapi ini juga berpengaruh dari kondisi ruang dan cahaya tempat kita mencoba kamera tersebut. Coba juga lensa zoomnya (optical zoom), apakah dapat digunakan dengan mudah dan cepat. Ketahui juga berapa lama waktu yang harus ditunggu dari mulai menghidupkan kamera sampai kamera siap digunakan. Jangan lupa mencoba LCD dan viewfinder-nya. Fitur Tambahan Banyak kamera digital yang dilengkapi dengan fitur tambahan. Salah satu fitur yang selalu ada adalah kemampuan merekam g...

THE BOTTOM LINE The synergy of a CCTV security system implies the following functional scenario: Some alarm sensor will detect immediately an unauthorized intrusion or entry or attempt to remove equipment. A CCTTV camera located somewhere in the alarm area will be fixed on the location or maybe pointed manually or automatically (from the guard site) to view the alarm area. The information from the alarm sensor and CCTV camera is transmitted immediately to the security console, monitored by personnel, and/or recorded for permanent documentation. The security operator receiving the alarm information has a plan to dispatch personnel to the location or to take some other appropriate action. After dispatching a security person to the alarm area, the guard resumes normal security duties to view any future event. If after a reasonable amount of time die person dispatched does not neutralize the intrusion or other event, the security guard resumes monitoring that situation t...

CCTV'S ROLE AND ITS APPLICATIONS In its broadest sense, the purpose of CCTV in any security-plan is to provide remote eyes for a security operator: to create live-action displays from a distance. The CCTV system should have recording means either a VCR or other storage media to maintain permanent records for training or evidence. Following arc some applications for which CCTV provides an effective solution: For security purposes, an overt visual observation of a scene or activity' is required from a remote location. An area to be observed contains hazardous material or some action that may kill or injure personnel. Such areas may have toxic chemicals, radioactive material, substances with high potential for fire or explosion, or items that may emit X-ray radiation or other nuclear radiation. Visual observation of a scene must be covert. It is much easier to hide a small camera and lens in a concealable location than to station a person in the area. There is ...

Security Investigations Security investigators have used CCTV very' successfully regarding company assets and theft, negligence, outside intrusion, and so on. Using covert CCTV, that is, using a hidden carpera and lens, it is easy to positively identify a person or to document an event. Better video image quality, smaller lenses and cameras, and easier installation and removal of such equipment have led to this high success. Many lenses and cameras are available today that can be hidden in rooms, hallways, or stationary objects. Equipment to provide such surveillance is available for locations indoors or outdoors, in bright sunlight or in no light. Safety CCTV equipment is not always installed for security reasons alone. For safety purposes as well, security personnel can be alerted to unsafe practices or accidents that require immediate attention. An attentive guard can use CCTV cameras distributed throughout a facility, in stairwells and loading docks and around...

Protecting Life and Minimizing Injury Through the intelligence gathered from CCTV, security and disaster control personnel should move all personnel to places of safety and shelter. Personnel assigned to disaster control and remaining in a threatened area should he protected by using CCTV to monitor their safety as well as access to these locations. By such monitoring, advance notice is available if a means of support and assistance for those persons is required or if injured personnel must be rescued or relieved. Reducing Exposure of Physical Assets and Optimizing Loss Control Assets should be stored or secured properly before an emergency, so they will be less vulnerable to theft or loss. CCTV is an important tool for continually monitoring sale areas during and after a disaster to ensure that material is not removed. In an emergency or disaster, the well documented  plan will call for specific personnel to locate highly valued assets, secure them, and evacuat...

THE ROLE OF CCTV IN ASSET PROTECTION In one phase of asset protection, CCTV is used lo detect unwanted entry into a facility, beginning at the perimeter location, and continuing by following the intruder throughout the facility (Figure 1-1). In a perimeter protection role, CCTV can be used with intrusion-detection devices to alert the guard at the security console that an intrusion has occurred. If an intrusion occurs, multiple CCTV cameras located throughout the facility follow the intruder so that there is a proper response by guard personnel or designated employees. Management must determine whether specific guard reaction is required and what the response will ho. Obviously, CCTV allows the guard to be more effective, but it also improves security by permitting the camera scene to be documented via a VCR and/or printed out on a hard copy video printer. In the relatively short history of CCTV, there have been great innovations in the permanent recording of video ...

PROTECTION OF ASSETS : AN OVERVIEW The application and integration of closed-circuit television (CCTV) to safety and security has come of age. CCTV' is a reliable, cost-effective deterrent and a means for apprehending and prosecuting offenders. Today, most safety and security applications require several different types of systems. such as alarm, lire detection, intrusion prevention and detection, access control and now CCTV. Security personnel today are responsible for multifaceted security and safety systems, in which CCTV plays an important role. With today's increasing labor costs, CCTV more than ever before has earned its place as a cost-effective means for improving security and safety, while reducing security budgets. Loss of assets and time due to theft is a growing cancer on our society that eats away at the profits of every organization or business, be it government, retail, service, or manufacturing. The size of the organization makes no difference...