However focus of most of our attention these days is on the transition to IP video technology; note that simple CCTV surveillance security camera system can still be highly effective for many surveillance applications, particularly those on a careful budget plan. With traditional CCTV surveillance cameras, the preparation of video signal and transmitted in analog format for local viewing from one central monitoring area. But that doesn’t mean you can’t utilize analog cameras in an IP-based surveillance environment. Utilizing IP video encoders and other equipment like digital video recorders and hybrid DVRs makes it possible to use your current analog cameras while relocating into the world of digital surveillance.
What is a CCTV Surveillance Security Camera System?
In its truest form, a CCTV camera is an analog video camera that communicates signals by means of coaxial cable to a single central location for monitoring, recording, and video analysis. While the new pattern is a push towards IP network cameras, Utilization of CCTV cameras is still wide, and offer a cost effective answer to many common surveillance situations.
CCTV technology has been around since the 1940’s, and became a major player in the security business around 1970. The technology is try and true, and there are CCTV surveillance camera models for basically any surveillance application. Fixation of the two main classes of CCTV cameras and cameras pan/tilt/zoom models which can rotate horizontally and vertically to cover more area.
Advantages and disadvantages of Analog Surveillance Security Camera System
Nowadays, there’s a lot to consider when assembling a video surveillance system. The first question on the vast majority’s brains is “Do I go with traditional analog cameras, or IP network cameras?” There are advantages and disadvantages to the two decisions. We should concentrate on simple CCTV surveillance cameras.
Advantages of Analog CCTV
• Lower initial cost. In many cases, analog cameras cost less upfront than IP network cameras.
• Wide-spread compatibility. Mixing and coordinating with camera models and surveillance equipment from various manufacturers is easy with an analog CCTV surveillance camera.
• Lower initial cost. Analog cameras will in general deal with low-light situations better than IP cameras overall. However IP camera technology is improving in this regard.
Disadvantages of Analog CCTV
• Expensive cabling. For large scale surveillance applications, analog cameras require complicated cabling plans that can be very costly and challenging to install.
• Limited features. Many of the high level features now accessible with IP cameras (for example: megapixel resolution, digital zoom, and video analytics). They aren’t accessible in analog CCTV models.
Parts of a CCTV Video Surveillance Security Camera System
There’s a lot that goes into a typical CCTV video surveillance system. While the cameras get the most of the consideration in the beginning. You also have different concerns, like viewing, recording, and archiving the video footage, and equipment needed for doing those tasks. Here’s a look at the basic components of a typical CCTV framework.
Surveillance cameras are the beginning stage for most CCTV video surveillance systems. There are unlimited possibilities when choosing CCTV cameras and lenses. Everything from fix models intend for monitoring very specific locations, to day/night cameras, and powerful PTZ domes for watching large areas.
In a traditional CCTV surveillance camera arrangement, operators view footage from a central location on a monitor like a TV. However with higher lines of resolution for better picture quality. Monitors can be devoted (which means they show video from a single camera), or call-up (which means operators can get multiple cameras at the same time).
With an analog system, need of coaxial cable for communicating video footage is from the CCTV surveillance cameras. This’s one of the downsides of simple CCTV video surveillance, as the cable can be costly and hard to install. Especially for larger camera networks, and those were cameras should be situated in difficult locations.
Most current CCTV video surveillance systems incorporate DVRs (digital video recorders) which empower operators to receive some of the benefits of a network based surveillance setup. DVRs convert the analog footage to digital, which helps to extend storage capacity, makes it a lot easier to search archived footage. It also permits users to stream video over an network for remote viewing from multiple locations.
CCTV Security Camera Types
Fixed CCTV Surveillance Security Camera System
Fixed surveillance cameras point in a single direction, which makes them ideal for monitoring very specific areas of interest. They’re also preferred for applications where it’s beneficial to install cameras in clearly visible locations. For this reason, fixed CCTV surveillance cameras are quite effective for capturing footage of suspicious activity, but also for deterring criminals and miscreants from completing their acts in the first place. Setting of the camera direction is during installation. Many surveillance cameras also accept exchangeable lenses and housings, so you have the adaptability to meet a wide variety of surveillance needs.
PTZ role in Surveillance Security Camera System
PTZ cameras are ideal for wide-area surveillance. They enable operators the ability to remotely control plan, tilt, and zoom capacities to follow movement and to zoom in for detailed monitoring. This is an area where analog CCTV surveillance cameras fall behind their 8mp IP Turret 4 Cameras counterparts. With IP cameras, the pan/tilt/zoom capacities are controlled physically or consequently and delivered over a single network cable, while analog cameras require extra wiring to perform similar functionality.
Measuring CCTV Image Quality
Understanding TVL Resolution
The picture detail of an analog CCTV surveillance camera is normally convey in a type of measurement call TVL (or TV Lines). Think about the video picture as being made out of active horizontal lines. These lines are conveyed to a monitor or recording device in two off-set fields. One field contains even-numbered lines while the other contains odd-numbered lines. The viewer sees a total picture because the lines are interlaced. Since the image has a 3×4 aspect ratio, the amount of detail you can quantify in 3/4 of the image’s width decides the level TVL resolution. Generally, most standard CCTV cameras offer a TVL resolution of around 380, while high-resolution cameras will deliver something more like 540 TVL.
Effects of Digital Conversion on Image Quality
Most analog CCTV systems today utilize a DVR as the recording medium. This permits the analog signs to be digitized for recording and for delivery over the network. While a DVR solution is a financially cost effective option in contrast to IP video, and provides clients with valuable advantages like digital storage and remote accessibility, there are disadvantages. One is a slight drop-off in picture quality. Simply put, it’s harder to retain picture quality in this type of setup on account of the different analog-to-digital conversions that happen from the camera to the recorder. Cabling distance also plays a part, as the further the video signals travel, the weaker they become. Still, a DVR-based solution is very good option for clients looking to receive some of the benefits of digital IP surveillance while utilizing lower-cost CCTV surveillance cameras.