Security Cameras and Video Surveillance Systems CCTV
As leading Security Cameras and Video Surveillance Systems CCTV suppliers in Kenya, Kenya Gadget Security solutions offer CCTV supply and installation solution for your home security systems or for monitoring commercial premises installation that is robust and can go for many years with little or no maintenance. We have everything from wireless security cameras to home security cameras to business security cameras and everything in between.
Here are our solutions that involve, Site Visits, installation, and Maintenance; Best Indoor and Outdoor Cameras, Motion Detector and PTZ Cameras, Network IP Security Cameras, wireless surveillance cameras, Hidden and Nanny Cameras, Video Recorders and Accessories
There's a lot that goes into a typical CCTV video surveillance system. While the cameras get most of the attention in the beginning, you also have other concerns, such as viewing, recording, and archiving the video footage, and the equipment required for carrying out those tasks. Here's a look at the basic components of a typical CCTV system. Cameras Security cameras are the starting point for most CCTV video surveillance systems. There are endless possibilities when choosing CCTV cameras and lenses – everything from fixed models designed for monitoring very specific locations, to day/night cameras, and powerful PTZ domes for patrolling large areas. Monitor In a traditional CCTV security camera setup, operators view footage from a central location on a monitor very much like a TV, but with higher lines of resolution for better picture quality. Monitors can be dedicated (meaning they display video from a single camera), or call-up (meaning operators can access multiple cameras at the same time). Cable With an analog system, coaxial cable is required for transmitting video footage from the CCTV security cameras. This is one of the drawbacks of analog CCTV video surveillance, as the cable can be expensive and difficult to install, especially for larger camera networks, and those were cameras must be positioned in difficult locations. DVR Most modern CCTV video surveillance systems incorporate DVRs (digital video recorders) which enable operators to reap 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 much easier to search archived footage, and also allows users to stream video over a network for remote viewing from multiple locations. CCTV Security Camera Types Fixed CCTV surveillance cameras Fixed security cameras point in a single direction, which makes them perfect 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 not only for capturing footage of suspicious activity, but also for deterring criminals and vandals from carrying out their acts in the first place. The direction of the camera is set during installation. Many security cameras also accept interchangeable lenses and housings, so you have the flexibility to meet a wide variety of surveillance needs. PTZ PTZ cameras are ideal for wide-area surveillance. They give operators the ability to remotely control pan, tilt, and zoom functions to follow activity and to zoom in for detailed monitoring. This is an area where analog CCTV security cameras fall behind their IP camera counterparts. With IP cameras, the pan/tilt/zoom functions are controlled manually or automatically and delivered over a single network cable, while analog cameras require additional wiring to perform similar functionality. Measuring CCTV Image Quality Understanding TVL Resolution The image detail of an analog CCTV surveillance camera is usually conveyed in a form of measurement called TVL (or TV Lines). Think of the video picture as being composed of active horizontal lines. These lines are delivered 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 complete picture because the lines are interlaced. Since the picture has a 3x4 aspect ratio, the amount of detail you can measure in 3/4 of the picture's width determines the horizontal TVL resolution. Generally, most standard CCTV cameras offer a TVL resolution of around 380, while high-resolution cameras will deliver something closer to 540 TVL. Effects of Digital Conversion on Image Quality Most analog CCTV systems today use a DVR as the recording medium. This allows the analog signals to be digitized for recording and for delivery over the network. While a DVR solution is a cost-effective alternative to IP video, and provides users with valuable benefits such as digital storage and remote accessibility, there are drawbacks. One is a slight drop-off in image quality. Simply put, it's harder to retain image quality in this type of setup because of the various analog-to-digital conversions that take place from the camera to the recorder. Cabling distance also plays a role, as the further the video signals travel, the weaker they become. Still, a DVR-based solution is a very good option for users looking to reap some of the benefits of digital IP surveillance while using lower-cost CCTV security cameras.