Posts Tagged ‘ camera security system’



Digital Video Recorder Surveillance

Written By:
Thursday, September 15th, 2011

Digital Video Recorder or DVR surveillance means that the activity being captured by the system’s cameras is being recorded by the DVR.  The following article explains the significance of the DVR to a camera security system and how it works.

A basic digital video security camera system is a component system that consists of three major components:

1)    One to many cameras;

2)    A DVR or Digital Video Recorder; and,

3)    A monitor or monitors

For digital video recorder surveillance the system operates in the following manner.  The digital video camera converts light energy into electrical energy which can be measured and is used to create digital video data.  This data is sent to the DVR.  As previously mentioned, the DVR is a digital video recorder, just like the hard disk drive or HDD of a personal computer.  However, in security camera systems, the DVR normally contains a processor, just like the processor in a Personal Computer or PC.

However, the processor in a DVR is a highly specialized piece of electronic circuitry.  Unlike the PC processor, the security camera DVR processor is manufactured to handle specific functions of security camera systems such as digital video file production, camera control, and recording of digital video files.  It uses a specific utility called a COmpression/DECompression or CODEC program to process the digital video file from the digital video data sent to it by the video camera.

Digital video is basically nothing more than a series of digital photographs taken in rapid succession.  Typically, high quality digital video is about 30 digital photographs taken within on second, also referred to as 30 frames per second or 30 fps.  When you think of the file size from just one high quality digital photograph, you can imagine how enormous a digital video file that takes 30 fps for 24 hours could be.

That’s why the DVR’s processor uses a CODEC to create the digital video file.  It uses special programming that shrinks the size of the file without sacrificing the high quality of the image.  CODECS change from time to time as different approaches and technologies make each CODEC better and more efficient.  One of the most popular and recent CODECs is called the H.264 CODEC.

The digital video recorder surveillance system create, process, and store digital video files that can be viewed instantly (live) on monitors or stored for later viewing on monitors or for archiving.  Many DVRs also have additional storage options such as CD/DVD writers or USB Flash drive connectivity to copy portions of video to portable media.  This may be necessary to give insurance companies, police departments, as evidence, etc.

The DVR may also contain other specialized features.  One common feature of many modern DVRs is Internet connectivity.  The DVR may contain its own Web server technology and programming so that it may be connected to any broadband Internet service and instantly become accessible anywhere in the world there is broadband Internet accessibility.

Most DVR and security camera systems come in 4, 8, or 16 channels.  This means that the DVR can handle 4, 8, or 16 separate camera inputs at one time.  Security systems requiring more than 16 cameras simply use additional DVRs to expand the number of cameras needed.

Highly specialized digital video recorder surveillance cameras may have highly specialized DVRs.  Portable systems, systems that are used for a small amount of time, systems that have self contained cameras and DVRs all in one unit may utilize different digital storage methods for the DVR.  For example, school bus DVR and security camera systems often use a Compact Flash Card or similar portable storage medium instead of a full sized hard disk drive as the DVR.

Is a DVR necessary in a security camera system?  No, not necessarily, but a system with just a monitor and no DVR will not be able to record the video so that it may be reproduced for later use.  A baby monitor is usually a good example of this.  On the other hand, a retail store facility would not realize the full potential of protection without a DVR and security camera system.

Other DVR and security camera systems functions pertaining to the DVR may include audio recording, various output display resolutions as well as connectors, remote control, e-mail and smartphone notification, and mouse and/or keyboard control.

 

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Camera Surveillance System Features

Written By:
Monday, September 27th, 2010

If you are looking for a digital video security and surveillance system, you should be aware of the more common camera security system features. Recent advances in digital video camera technology, digital video processing technology, and digital video storage capacities have provided an abundance of useful features and options.

Today’s camera security system features allow the user to have a complete standalone system, a system that can work using a personal computer to replace some of the components of the system (usually resulting in a less expensive system), or a system that can be remotely viewed and controlled via the internet. In addition, most contemporary security camera systems are component systems; that is, the individual parts of the system can be mixed and matched without regard to type or manufacturer with relative ease so the user can create a custom designed system to suit their needs.

Today a typical digital video camera security system features one to several cameras, a processor/Digital Video Recorder or DVR, and a monitor. Let’s examine the camera security system features by looking at the two main components; digital video cameras and processor/DVRs.

Digital Video Cameras
These cameras have a variety of options or features including:
• Specifically made for indoor or outdoor use
• Wireless technology, eliminating the need for a video transmission cable
• Powered by rechargeable batteries (this feature combined with wireless transmission technology makes these cameras truly wireless)
• Light Sensitive Day/Night vision that can produce high quality video images in very low light conditions
• Night vision infrared that can produce high quality black and white video images in total darkness
• Audio recording
• Pan-Tilt-Zoom (PTZ) functions-combined with software or circuit programming these cameras can “track” or “follow” objects
• Motion activated-these cameras do not begin capturing images until a motion detector senses movement
• IP (Internet Protocol) Ready-these cameras have their own built in server and can be networked using the internet
• Hidden or Disguised Covert Cameras-these cameras are so small they can be easily hidden in other objects or the cameras are built already embedded or disguised within other objects

Processors/DVRs
The processor/DVR handles several tasks and is the “brain” of the system. The processor handles the digital video signals sent by the cameras and uses a COmpression/DECompression or CODEC utility to make the digital video files easier to handle. It may also handle other functions like motion detection or PTZ controls. Finally, the DVR is equivalent to a personal computer’s hard disk drive. It stores the digital video files for archiving or later use.

One of the main features of this unit is the number of channels or cameras it can handle at once. Most units offer 4, 8, or 16 channel capability.

Camera security system features for the processors used today offer a variety of different CODEC utilities. There are many other choices for CODEC utilities includingH.264, MPG1 H.26 to MPG4, MOV, and DIV to name a few.

The DVR’s main feature is its storage capacity. Currently DVRs can be purchased that have storage capacities ranging from Gigabytes to Terabytes. As computer hard drive technology increases, storage capacity seems to increase and price usually decreases.

The processor/DVR unit is much like the case of a desktop computer. In addition to the features already mentioned these units may have additional bays or slots to add additional PCI cards or hardware. Common optional features of this type include CD/DVD writers or Flash Card writers that can copy the digital video files from the DVR to more portable media. This is useful for providing the video to police, insurance agencies, etc. or simply for archiving.

Another camera security system feature for the processor/DVR is a computer PCI card that works as a processor/DVR or utilizes a typical personal computer as the processor/DVR. This feature is great for residences because it normally reduces the cost of the system considerably.

As you can see, there are many different camera security system features existing today. This should give you a good working knowledge of the most common features that are available for your use and that will allow you to design your own custom component system.

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Camera Security System Features

Written By:
Monday, August 9th, 2010

If you are looking for a digital video security and surveillance system, you should be aware of the more common camera security system features. Recent advances in digital video camera technology, digital video processing technology, and digital video storage capacities have provided an abundance of useful features and options.

Today’s camera security system features allow the user to have a complete standalone system, a system that can work using a personal computer to replace some of the components of the system (usually resulting in a less expensive system), or a system that can be remotely viewed and controlled via the internet. In addition, most contemporary security camera systems are component systems; that is, the individual parts of the system can be mixed and matched without regard to type or manufacturer with relative ease so the user can create a custom designed system to suit their needs.

Today a typical digital video camera security system features one to several cameras, a processor/Digital Video Recorder or DVR, and a monitor. Let’s examine the camera security system features by looking at the two main components; digital video cameras and processor/DVRs.

Digital Video Cameras
These cameras have a variety of options or features including:

  • • Specifically made for indoor or outdoor use
  • • Wireless technology, eliminating the need for a video transmission cable
  • • Powered by rechargeable batteries (this feature combined with wireless transmission technology makes these cameras truly wireless)
  • • Light Sensitive Day/Night vision that can produce high quality video images in very low light conditions
  • • Night vision infrared that can produce high quality black and white video images in total darkness
  • • Audio recording
  • • Pan-Tilt-Zoom (PTZ) functions-combined with software or circuit programming these cameras can “track” or “follow” objects
  • • Motion activated-these cameras do not begin capturing images until a motion detector senses movement
  • • IP (Internet Protocol) Ready-these cameras have their own built in server and can be networked using the internet
  • • Hidden or Disguised Covert Cameras-these cameras are so small they can be easily hidden in other objects or the cameras are built already embedded or disguised within other objects

Processors/DVRs
The processor/DVR handles several tasks and is the “brain” of the system. The processor handles the digital video signals sent by the cameras and uses a COmpression/DECompression or CODEC utility to make the digital video files easier to handle. It may also handle other functions like motion detection or PTZ controls. Finally, the DVR is equivalent to a personal computer’s hard disk drive. It stores the digital video files for archiving or later use.

One of the main features of this unit is the number of channels or cameras it can handle at once. Most units offer 4, 8, or 16 channel capability.

Camera security system features for the processors used today offer a variety of different CODEC utilities. There are many other choices for CODEC utilities including H.264, MPG1 to MPG4, MOV, and DIV to name a few.

The DVR’s main feature is its storage capacity. Currently DVRs can be purchased that have storage capacities ranging from Gigabytes to Terabytes. As computer hard drive technology increases, storage capacity seems to increase and price usually decreases.

The processor/DVR unit is much like the case of a desktop computer. In addition to the features already mentioned these units may have additional bays or slots to add additional PCI cards or hardware. Common optional features of this type include CD/DVD writers or Flash Card writers that can copy the digital video files from the DVR to more portable media. This is useful for providing the video to police, insurance agencies, etc. or simply for archiving.

Another camera security system feature for the processor/DVR is a computer PCI card that works as a processor/DVR or utilizes a typical personal computer as the processor/DVR. This feature is great for residences because it normally reduces the cost of the system considerably.

As you can see, there are many different camera security system features existing today. This should give you a good working knowledge of the most common features that are available for your use and that will allow you to design your own custom component system.

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DVR Camera Security System

Written By:
Tuesday, June 1st, 2010

A DVR camera security system or digital video recorder camera security system is a practical answer for providing recorded digital video monitoring for business and residential applications alike. These systems are economical and versatile and can include a great deal of advanced features for special applications as well.

A DVR camera security system is a component system much like a component stereo or home theater system in that each of the components can vary to fit individual needs. Yet, the components work collectively to provide high quality security and surveillance monitoring and recording.

A basic DVR camera security system consists of one to several digital video cameras, a processor or capture board that also utilizes special programming or circuitry to make the digital video file easier to handle, a monitor for viewing live or recorded video, and a digital video recorder for storing the digital video files for viewing at a later time or for archival purposes.

There are several camera types and features available to complement a DVR camera security system. Here is a partial list of just some of the camera types and features:

  • Indoor cameras
  • Cameras made specifically for outdoor use
  • Wireless cameras
  • Day/night vision cameras
  • Infrared night vision cameras
  • Pan, tilt, and zoom (PTZ) cameras
  • Cameras capable of recording audio
  • Hidden or disguised cameras
  • Dome shaped cameras
  • Bullet cameras

All of these cameras can produce high quality, high resolution color digital video. Some cameras can be ordered with specially designed programming. For example, a typical PTZ camera when used with specialized motion detection programming can be used to track moving objects such as people or slow moving vehicles.

The digital video cameras of a DVR camera security system usually use one of two different electronic sensors called a Charged Coupled Device or CCD or a Complimentary Metal Oxide Semiconductor or CMOS to create the digital video. The CCD or CMOS works by converting light energy or photons into electrical charges that can be used to create digital video images.

The electrical information created by the electronic sensor is sent to a processor that transforms it into a digital video file. On a typical DVR camera security system, the processor and DVR are contained within the same unit, much like a personal computer. The processor may contain a capture board, a separate integrated circuit board that processes the video images easing the burden on the processor so that it can work on storing, camera control, and other activities.

A digital video file is basically the same as a digital photograph file; except a digital video contains several photographs or frames per second (fps). Smooth, fluid video is normally produced at about 30 frames per second. In other words 30 digital photographs are taken per second. The digital file can become incredibly large in a relatively short time period at this frame rate.

Therefore, to make the digital video files of a DVR camera security system smaller and easier to handle while maintaining a high quality image, a CODEC is normally used. A CODEC is an abbreviation for COmpression/DECompression and is either provided by programming software or “hard wired” into the circuitry of the capture board or processor. The CODEC makes it possible for the processor to store much longer time periods of video on the DVR and to display several digital videos on the monitor at one time.

The monitors used on modern DVR camera security systems are usually LCD monitors like the monitors used with contemporary personal computer systems. The monitors normally connect to the DVR/processor and can be used to display the images that are currently being created by the digital video cameras or to display the digital video files that were recorded earlier.

DVRs are digital magnetic storage disks similar to the hard disk drives of personal computers. Storage capacities range from several gigabytes to terabytes.

A DVR camera security system offers the ability to provide high quality digital video for security and monitoring applications while storing the video files. The added benefit of these systems is that they are usually “stand-alone” systems that can be used just about anywhere.

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