CCD Chip Introduction

  A CCD(charge coupled device) composed of thousands of individual pixels with a tiny 1/2", 1/3", even 1/4" chip. Each pixel responds to light falling into it by storing a tiny electricity charge. The pixels locate on a precise grid which consists of vertical and horizontal transfer registers sending the signals to the CCTV cameras's video processing circuit. This transfer of signals occurs sixty times per second.

  Currently, The 1/3" CCD chip becomes the most popular sensor format, the dimensions are 4.4mm (horizontal) and 3.3mm (vertical) and 5.5mm (diagonal). The 1/4" sensor format which is 4mm (diagonal), 3.2mm (horizontal) and 2.4mm (vertical), is widely used in color cameras.The Electronic Shutter of CCD chip plays a leading role to produce a wonderful and reliable picture.

CCD and CMOS(complementary metal oxide semiconductor) sensors are the different digital technologies for capturing image. They both have strengths and weaknesses in various applications.

The resolution of CCTV system

  The resolution of CCTV cameras system is usually measured by TV lines. The vertical TV lines is fixed and the maximum is 350 TV lines in 525-line NTSC system. However, as the parameter of image quality, the horizontal TV lines depend on the quality of camera, lens, transmission and monitor.

Camera Resolution

  Pixels is used by the industry of CCD video camera sensor as it's quality parameter. in EIA system, Medium resolution of B/W camera is 510 horizontal pixels and 492 vertical pixels which equals to 380 TV lines. High definition is 768(H) x 492(V) pixels and equivalent to 570 TV lines. Color camera's medium resolution is 330TV lines and high resolution is over 460 TV lines.

Monitor Resolution

  The monitors in NTSC system have 525 vertical scanning lines in spite of their size. in EIA system, The horizontal 700 TV lines of B/W monitors represents medium level and over 900 TV lines means high resolution. The color monitor's horizontal resolution of 300 TV lines represents medium quality and over 450 TV lines resolution represents high resolution.

  For the sake of system's resolution, we suggest select a monitor which has better resolution compared to your camera.

what is CCTV？

  CCTV, Closed Circuit TeleVision, is really a TV system which doesn't broadcast TV signals to public but transmits them over to limited monitor(s). CCTV cameras system usually uses CCD video cameras (to create the video), cable or wireless transceivers or Internet (for video transmission), and monitors (to watch the video). CCTV system is mainly used for surveillance purpose, besides, it can also in other fields like laboratory in schools or in private companies, even the production lines in factories. Along with the usage of CCTV system increased, various CCTV equipment, such as Time Lapse VCRs, combiners, infrared illuminators, Pan/Tilt, are developed. The newest development is web camera server utilizing the web for remote surveillance.

Fake or real security camera? how to choose

A well designed video CCTV system can prevent crime and provide invaluable information after a theft or attack. Rather than install the proper cameras for safe, some persons just hang "fake" cameras on the buildings, even worse, some providers suggest that they do so. 

Just as a corn has two sides, fake cameras have advantages and shortcomings. Fake cameras are very economic compares to real surveillance, and in some ways, it have effects. However, if you want to provide real protection, please choose real CCTV cameras. There are some factors as follows you need to pay attention.

Fake Cameras Can Do Nothing. The fake cameras can’t record activity. They just hang there on the building, nothing can do. So do not waste the money and effort. Besides, some fake cameras are so “fake”, you can easily tell the ture and fake cameras at a glance.

·         In some cases, some people mix the real and fake cameras in a single surveillance camera system and believe they can be effective. But the Things go athwart, Putting real and fake cameras near each other means ” I am a fake camera”, some trained folks can know exactly where you're not monitoring..

·         All in all, If your business needs protection, take some time to choose proper CCTV cameras and cover the areas that require surveillance. If you are just want to play a trick, the economic fake camera is your best.

CCD vs CMOS camera

  CCD stands for charge-coupled device; CMOS stands for complimentary metal-oxide semiconductor. A CCD image sensor or a CMOS sensor is used in most digital CCTV cameras. Capturing light and converting it into electrical signals is the main task of the two types of sensor

A CCD image sensor is an analog device. These are the chips onto which the light captured by a camcorder's lens is focused. Camcorder processes those signals, then the image is recorded to the camcorder's storage.

CMOS VS CCD

A CMOS imaging chip is a type of active pixel sensor made using the CMOS semiconductor process. Extra circuitry next to each photo sensor converts the light energy to a voltage. Additional circuitry on the chip may be included to convert the voltage to digital data.

Neither technology has a clear advantage in image quality. On one hand, CCD sensors are more susceptible to vertical smear from bright light sources when the sensor is overloaded; high-end frame transfer CCDs in turn do not suffer from this problem. On the other hand, CMOS sensors are susceptible to undesired effects that come as a result of rolling shutter.

CMOS can potentially be implemented with fewer components, use less power, and/or provide faster readout than CCDs. CCD is a more mature technology and is in most respects the equal of CMOS, CMOS sensors are less expensive to manufacture than CCD sensors.

Another hybrid CCD/CMOS architecture, sold under the name "sCMOS", consists of CMOS readout integrated circuits (ROICs) that are bump bonded to a CCD imaging substrate – a technology that was developed for infrared staring arrays and now adapted to silicon-based detector technology. Another approach is to utilize the very fine dimensions available in modern CMOS technology to implement a CCD like structure entirely in CMOS technology. This can be achieved by separating individual poly-silicon gates by a very small gap. These hybrid sensors are still in the research phase, and can potentially harness the benefits of both the CCDs and the CMOS imagers. 

DDNS Service & Dynamic IP Addresses Used in Security Systems

  Many users of surveillance camera system want to view their CCTV cameras remotely over the Internet.  In order to do this, a high-speed Internet connection is needed. Usually, a static or dynamic IP address is assigned by Internet service provider (ISP).  What is the difference between dynamic and static IP address? So, I tell the difference between the two kinds of IP address. Set to an IP address which is unchanged for months or years at a time, this is a static IP address, set to an IP which is only good for a limited time, and which is changed according to the policy set by your ISP's DHCP server, this is a dynamic IP address

If you use a static IP address at your DVR location, you can connect to your security system remotely using the same IP address all the time. If you have a dynamic IP address, things changes because ISP assign IP address randomly.  If you want to track any changes to the dynamic IP, you need subscribe to a dynamic DNS service (DDNS) that keeps track of it for you.  The most popular DDNS service is dyndns.com for free.

When you register with a DDNS service, you can create a host name, you can use hostname to access a website on the Internet.  You then associate that host name with the IP address of your Internet service connection. We can use a router supporting DDNS to do this. Log into your router and locate the DDNS setup screen.  The location may vary by router manufacturer.  Enter your DDNS account settings, including your login, password, and the host name that you registered.  Now, anytime your router detects that your IP address has changed from your ISP, the router will notify the DDNS service about the new IP address.  This allows you to always use the hostname that you registered to connect to your DVR remotely over the Internet.  There is no need to remember or keep track of your IP address.

New Japanese security camera scans 36 million faces per second

  A new Surveillance Camera product has been developed by a Japanese company which can search through a massive amount of data in one second, based on facial recognition technologies.

  If you thought Big Brother had already arrived, Hitachi Kokusai Electric has just kicked the gauge up several notches, in the form of millions of indexes.

  According to DigInfoTV, a Tokyo video news site, Hitachi Kokusai Electric's new development can sift through data on 36 million faces in one second. The report states the technology can find a face matching against either surveillance footage or a photo.

  “This high speed is achieved by detecting faces through image recognition when the footage from the CCTV cameras is recorded, and also by grouping similar faces,” Seiichi Hirai, Hitachi Kokusai Electric researcher told DigInfo TV.

  "We think this surveillance camera system is suitable for customers that have a relatively large-scale surveillance system, such as railways, power companies, law enforcement, and large stores," the company said.

  RT reported Hitachi has used algorithms combined with facial recognition software. Any images captured on the new system is susceptible to a search conducted on other databases to track people and saved in what sounds like a master database of sorts. RT describes it as "Where before authorities would have spent hours trawling through CCTV footage, an individual can now be found in the blink of an eye."

  Reportedly the search results are instant and possible candidates immediately shown to the searcher, although limitations exist, such as the faces must turn within 30 degrees of the camera and be 40 x 40 pixels in size.

  So while this appears to be Hitachi's niche market segment, where does that leave everyone else who will undoubtedly be impacted if these agencies and businesses embrace the new CCTV monitoring system?

  Geekosystem points out, "Of course, the existence of technology that can perform facial recognition on such a scale doesn’t directly translate to immediate and total surveillance of everyone everywhere. It does, on the other hand, make the installation of cameras, lots of cameras, infinitely more useful and justifiable, from a cost-benefit standpoint."

  Then again, lesser scaled versions using biometrics in the past have failed to meet objectives, so in all likelihood, if this new product succeeds in its purpose, it'll depend upon the data being compared against.

  No quote just yet on how much something like this will cost, but it looks like this product will be available sometime next year. If this successfully launches and works as planned, it sounds as if 2013 could perhaps be the year Big Brother truly arrives in style.

  What do you think? Do these types of technologies using stored biometric data help protect society? Does it make you feel more secure?

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. 

Coca Cola Security Cameras

This is a very meaningful video about security camera made by Coca Cola, kindness, friendship, love, honesty, craziness, all these emotions are very real, let's look at the world a little differently, the word is wonderful。

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.