CCTV Surveillance systems used for preventing crime

 surveillance camera system play an important role in preventing and fighting local and international crime. CCTV systems are deployed in public places or retail markets can avoid crime, make citizens feel safer. At present, most CCTV systems adopt digital for improved performance, which have quicker feedback than analog systems.

  Evidence has shown that CCTV systems mostly avoid crimes and robberies, but some crimes such as rape and aggravated assault, CCTV systems can not catch these crimes because they may happen far away from the surveillance camera. In order to make a CCTV system be more effective, the electronic system must be used in conjunction with human know-how and skills and it should be carefully integrated into existing security plans. 

  linking CCTV cameras together to form a worldwide network to prevent terrorism, is a good blueprint, but this international security system would cost billions of dollars and would need extensive international cooperation. 

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Hidden Camera Introduction

A hidden camera is a still or video camera. The reason why we call "hidden" is that it is either invisible to the subject being filmed, or is disguised as another object. Hidden CCTV cameras get more and more popular for household surveillance, and can be built into common household objects such as smoke detectors, motion detectors and mobile phones, etc

Description

A hidden spy camera can be wired or wireless. The former will be connected to a TV, VCR, or digital video recorder  (DVR), whereas a wireless hidden camera can be used to transmit a video signal to a receiver. Due to the wide proliferation and lower costs of electronics devices, hidden cameras are increasingly popular.

In reality television

Hidden cameras are also sometimes used in reality television to catch participants in unusual or absurd situations. Participants will either know they will be filmed, but not always exactly when or where, or do not know they have been filmed until later, at which point they may sign a release or give consent to the footage being produced for a show. This latter sub-genre of unwitting participants began in the 1940s with Allen Funt‘s Candid Microphone theatrical short films . In 1996 the genre was given an overhaul by Travis Draft who introduced the glasses cam with his show Buzzkill. The show took hidden camera to a whole new level where the performer (Draft Himself and Cronies) were the focal point.

Legality of using hidden cameras cause controversy. Some hidden camera television shows have also led to lawsuits.

What is CCTV CAMERA?

Video surveillance systems provide a forever open eye to watch over property, allowing a sense of safety and security. Cameras attached to a closed circuit television (CCTV) system send data to a computer or video recorder for live viewing or later playback. The term closed circuit means that the images or video recorded by the cameras are not broadcast, but saved on a storage device. Marie Van Brittan Brown firstly invented the CCTV  camera.

Video cameras`

How to tell the difference between analogue and digital cameras depend on the basis of sending analogue or digital signals to a storage device. In a less technical way, an analog camera is one that uses film rather than some type of electronic sensor, such as a charge-coupled device (CCD) or a complementary metal oxide semiconductor chip (CMOS).

Analogue

Video tape recorder can record analogue signals as pictures directly. If we use tape to record the analogue signals, the tape must run very slowly to keep continuous operation. This is because in order to allow a three hour tape to run for 24 hours, it must be set to run on a time lapse basis which is usually about four frames a second.

Analog refers to devices in which measurable output quantities, such as voltage or pressure, represent input data. Let us take a microphone for voice recording for example. As you speak, fluctuations in air pressure strike the diaphragm of the microphone, causing corresponding fluctuations in voltage in an electrical circuit. The voltage is an "analog" of the sound waves that make up your voice.

Digital

As shown above, these cameras use a digital signal which can be saved directly to a computer. "Digital" describes the process by which a signal, such as the light reflected from a scene, is broken into the binary format so it represents the scene as a series of ones and zeros. That data is then transferred to a storage device and reassembled into a representation of the original scene. The merit of digital is that it have error correction mechanism which can correct any errors that occur during the data transfer.

As analogue circuits produce continuous, fluctuating signals, they are more sensitive to noise or distortion. With analogue, a small change in the signal can result in a significant change in the output, lots of information is lost in the process. However, digital signals deal with only one of two values at any given point in the signal chain, are much more tolerance to noise.

network

A network camera records images and sends the compressed versions over the network, also called an IP camera. Network cameras used in surveillance systems usually offer a interface so the camera can be remotely accessed and viewed over the Internet. The network camera was pioneered in 1996 by Axis Communications, the worldwide leader in the field. because network cameras are embedded devices, resolutions are higher than CCTV analogue cameras. A typical analogue CCTV camera has a PAL (768×576 pixels) or NTSC (720×480 pixels), whereas network cameras may have VGA (640×480 pixels), SVGA (800×600 pixels) or quad-VGA (1280×960 pixels), "megapixel" resolutions. Network cameras are a good surveillance solution requiring one network camera, some Ethernet cabling, and one PC.

About SurveilZone.com

Welcome and thanks for visiting SurveilZone.com, where you will find thousands of products offered at incredible prices.

SurveilZone.com is an Online supplier of CCTV cameras, videos surveillance systems, and CCTV equipment. We have been specialized in CCTV since 2008. We supply surveillance systems and equipment to individual homeowners, schools, warehouses, convenience stores, businesses of all sizes, as well as government institutions. We are a team of customer service and engineering staff, and we can help choose suitable products or design a system that will fit your needs and budget.  

We're not only the distributor of surveillance equipment but we also have QC department to test every product that we sell and trained engineers for free lifetime technical support. We guarantee all products from us are 100% brand new, no second-handed, no reconditioned.

We strive for excellence in customer service, technical support, and providing the highest quality surveillance equipment of good value. We enjoy serving and helping you to select CCTV equipment. We are more than happy to communicate with our customers, and welcome any feedback regarding to our website or products.

Any query or question, please do not hesitate to send us an email to surveilzone@gmail.com. All enquiries would be responded within 24 hours.