Posts Tagged ‘ digital video file’



DVR Security System Cameras

Written By:
Friday, May 6th, 2011

Today’s Digital Video Recorder or DVR security camera systems are an amazing bundle of new high quality technology.  The security camera industry can also thank the personal computer industry as a contributor, because a lot of today’s DVR security camera systems use recently invented technology borrowed from the computer industry.

In this article we are going to describe how a typical DVR security camera system works.

Modern digital video security and surveillance systems are basically component systems.  This means that essentially, the parts of the system are like plug n play items used in computers.  All of the components do not have to be made by one manufacturer, they can differ in function and still work on the system, and they can usually be removed and replaced with something else and the system will continue to work.

This provides tremendous versatility in application because the DVR security camera systems are no longer required to use all of the same components.  For example, an 8 channel system may have 6 bullet cameras and 2 Pan-Tilt-Zoom (PTZ) camera made by a totally different manufacturer.

 

Let’s take a closer look at how a DVR security camera system (and its individual components) works.  The first component of the system is the camera.  There are so many different type of cameras available today that we do not have the space for this article to cover them all.  Instead, let look at how they work

DVR security cameras possess one primary function; transfer the reflecting light that is in its field of vision into electrical impulses that can be measured, manipulated, and compiled to create a digital video file.  This information is then sent to the DVR and/or monitor for processing and viewing.

The camera does this by using one of two different electronic sensor chips called a Charged Coupled Device or CCD or a Complementary Metal Oxide Semiconductor or CMOS.  Although both sensors work a little differently, the both yield the same end product–the electrical data that can be used to create a digital video file.

This is accomplished by the camera’s lens focusing the field of view onto one of these chips, which generally range from only 1/4″ to 1/2″ square.  When the light strikes the sensor chip, small electrical impulses are created by the pixels in the chip.  Each one can be measured and used to create the data that will be used to display the cameras field of view as a digital video.

At this point the signal is still an analog type signal.  The camera sends this analog data through an analog-to-digital processor chip to convert the data into digital or binary format.  The camera also contains a Digital Signal Processor or DSP chip that is used to make fine adjustments to the data.  Once the digital information is ready it is sent via a video transmission cable or other means to the DVR, hence the name DVR security camera systems.

Once the signal reaches the DVR, it applies its own DSP technology along with a CODEC utility.  Codec is an acronym for COmpression/DECompression.  This utility program uses a special algorithm program that reduces the incredibly large file into just a fraction of its original size without sacrificing significant quality.  Once this is accomplished the digital video file is compiled and is saved on the DVR’s hard disk drive and/or displayed on a system monitor.

It should be easy to see now why DVR security camera systems benefit from technological improvement in the computer world.  Many PC based devices are used in security camera systems.  For example, the DVR saves the digital video file to its hard disk drive for storage.  USB Thumb drives can be used to update firmware and copy and transfer video footage.  DSP and memory chips are directly related to the computer industry.

Even the monitors used today are basically the same as computer monitors but they may include a few extra input options.  Monitors have gone from the bulky Cathode Ray Tube (CRT) type to the LCD type just like most computer monitors.

Security Camera King offers a wide selection of DVR security camera systems with everything you need to install it but the tools.  Try one of our systems, the Elite Mini Economy, the Elite Mini HD, the Elite Series, or the Ultimate Series and see for yourself.  The majority of our cameras come with a 1 year full warranty (some models have 2 years) and our DVRS have a 3 year warranty.

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DVR Security Camera systems

Written By:
Friday, May 6th, 2011

Today’s Digital Video Recorder or DVR security camera systems are an amazing bundle of new high quality technology.  The security camera industry can also thank the personal computer industry as a contributor, because a lot of today’s DVR security camera systems use recently invented technology borrowed from the computer industry.

In this article we are going to describe how a typical DVR security camera system works.

Modern digital video security and surveillance systems are basically component systems.  This means that essentially, the parts of the system are like plug n play items used in computers.  All of the components do not have to be made by one manufacturer, they can differ in function and still work on the system, and they can usually be removed and replaced with something else and the system will continue to work.

This provides tremendous versatility in application because the DVR security camera systems are no longer required to use all of the same components.  For example, an 8 channel system may have 6 bullet cameras and 2 Pan-Tilt-Zoom (PTZ) camera made by a totally different manufacturer.

 

Let’s take a closer look at how a DVR security camera system (and its individual components) works.  The first component of the system is the camera.  There are so many different type of cameras available today that we do not have the space for this article to cover them all.  Instead, let look at how they work

DVR security cameras possess one primary function; transfer the reflecting light that is in its field of vision into electrical impulses that can be measured, manipulated, and compiled to create a digital video file.  This information is then sent to the DVR and/or monitor for processing and viewing.

The camera does this by using one of two different electronic sensor chips called a Charged Coupled Device or CCD or a Complementary Metal Oxide Semiconductor or CMOS.  Although both sensors work a little differently, the both yield the same end product–the electrical data that can be used to create a digital video file.

This is accomplished by the camera’s lens focusing the field of view onto one of these chips, which generally range from only 1/4″ to 1/2″ square.  When the light strikes the sensor chip, small electrical impulses are created by the pixels in the chip.  Each one can be measured and used to create the data that will be used to display the cameras field of view as a digital video.

At this point the signal is still an analog type signal.  The camera sends this analog data through an analog-to-digital processor chip to convert the data into digital or binary format.  The camera also contains a Digital Signal Processor or DSP chip that is used to make fine adjustments to the data.  Once the digital information is ready it is sent via a video transmission cable or other means to the DVR, hence the name DVR security camera systems.

Once the signal reaches the DVR, it applies its own DSP technology along with a CODEC utility.  Codec is an acronym for COmpression/DECompression.  This utility program uses a special algorithm program that reduces the incredibly large file into just a fraction of its original size without sacrificing significant quality.  Once this is accomplished the digital video file is compiled and is saved on the DVR’s hard disk drive and/or displayed on a system monitor.

It should be easy to see now why DVR security camera systems benefit from technological improvement in the computer world.  Many PC based devices are used in security camera systems.  For example, the DVR saves the digital video file to its hard disk drive for storage.  USB Thumb drives can be used to update firmware and copy and transfer video footage.  DSP and memory chips are directly related to the computer industry.

Even the monitors used today are basically the same as computer monitors but they may include a few extra input options.  Monitors have gone from the bulky Cathode Ray Tube (CRT) type to the LCD type just like most computer monitors.

Security Camera King offers a wide selection of DVR security camera systems with everything you need to install it but the tools.  Try one of our systems, the Elite Mini Economy, the Elite Mini HD, the Elite Series, or the Ultimate Series and see for yourself.  The majority of our cameras come with a 1 year full warranty (some models have 2 years) and our DVRS have a 3 year warranty.

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Security Video Cameras

Written By:
Wednesday, March 23rd, 2011

Security video cameras are one of three major components of today’s digital video security systems which also consist of a Digital Video Recorder or DVR and one or more monitors.  The digital video camera is an interesting piece of electronic wonder, and as technology continues to advance so do the features and abilities of the security video camera.

In this article, we’ll take a look at how a security video camera operates.  We’ll also take a look at some of the more common features and options that are available on today’s digital video security cameras.

Security video cameras are electronic based devices that transfer light images into electrical images that can be viewed on a monitor.   One of the key factors in accomplishing this is the electronic sensor that is used inside the camera to do the conversion.  Cameras make use of one of two different technologies with either one yielding the same end result.

 

These sensors are called a Charged Coupled Device or CCD and a Complementary Metal Oxide Semiconductor or CMOS.  The lenses focus the light image onto this small sensor chip (most range from about 1/4 inch 1/2 inch square).  The chip is sensitive to light energy in such a way that when light strikes the chip and electrical impulse is created that can be measured and used to construct a video image.

Ironically, even in digital security video cameras, the video signal that is created is originally analog in nature.   The signal is passed through a special Integrated Circuit or IC chip known as a analog-to-digital converter as well as a Digital Signal Processor or DSP before it is sent out the camera to the DVR.  In most systems the signal is sent along a cable (RG-59, CAT5, etc) from the camera directly to the DVR or monitor; hence the often used phrase “Closed Circuit TeleVision” or CCTV.

Once the video data reaches the DVR, it must be worked on some more by the DVRs DSP.  The data is gathered or compiled into a file called a digital video file.  Security video cameras create digital video files that can be played back by most personal computers and DVD players.  This digital video file is actually several digital photographs taken in raped succession over a very short time (usually around 30 photographs or frames per second or 30 fps).

The digital video file can quickly become several Gigabytes in size, especially when there are multiple cameras (which is usually the norm) recording at the same time.  There fore to make handling of the file easier for the processor and to get the maximum amount of time-recording per given storage capacity, the file is reduced to a fraction of its original size.

This is done by a COmpression/DECompression or CODEC utility.  The utility may be hardwired (usually an IC chip) or it may exist in the form of software.  Basically, a CODEC is a mathematical algorithm that finds a way to store repetitive data only once, thereby reducing file size while maintaining video quality.  Security Camera King’s DVRs all use the latest, most efficient CODEC known as H.264.

Security video cameras come in a variety of shapes, sizes, features, and price ranges.  Covering all of these variations is by far, beyond the capacity of this article, however we will attempt to try to cover some of the more popular characteristics.  If you would like additional more specific information on a camera variation, try searching our knowledge base for more information.

 

There are basically four types of security video cameras based on shape.  They are:

  • Box cameras;
  • Bullet cameras;
  • Dome cameras; and,
  • A variety of different hidden or disguised cameras that take the shape of the device they are built into.

These cameras are further made in one of three different styles based on where they are intended to be used.  These are:

  • Indoor cameras;
  • Outdoor cameras; and,
  • Indoor/Outdoor cameras.

In addition, cameras can come with a myriad of features.  Depending on the manufacturer and camera model, some features may be considered standard issue for the camera while others will be considered an option, usually with an additional cost:

  • Infrared night vision;
  • Pan-Tilt-Zoom (PTZ);
  • Motion detection;
  • Very high resolution output;
  • Audio capability;
  • Internet compatible;
  • Explosion proof; and,
  • Wireless.

Generally speaking, if you have a specific security video camera need, there’s one out there that can nicely fit the bill.

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CCTV Camera Systems

Written By:
Thursday, March 17th, 2011

These days there are more Closed Circuit TeleVision or CCTV camera systems than applications for their uses.  If you are interested in such a system, it will serve you well to do some research before venturing out to make your fist purchase.  At Security Camera King, we encourage you to shop around, because we know that we offer the highest quality systems and the best possible prices.  After you’ve looked at other offers, we’re sure you’ll come back to us to make your final purchase.

You may be asking what is meant by the term “CCTV Camera System.”  A CCTV camera system is simply a digital video camera system that normally includes a Digital Video Recorder and a display monitor.  Today’s systems are entirely digital and the systems are component systems, meaning that when putting together your system, you can choose different pieces of the system that have different functions to tailor fit the system to your needs.

First a little history.  Closed Circuit Television or CCTV got its name way back in the days of analog transmissions.  A typical video security system was referred to as a Closed Circuit system because the cameras did not broadcast their signals to the open public.  These cameras were basically smaller versions of the cameras used in television studios.  However, television studio broadcasts were amplified and distributed to the open public (i.e. anyone that had a receiver or television).

CCTV on the other hand, consisted of a circuit of one or more cameras, each connected to a video recorder by means of a video transmission cable.  Analog CCTV camera systems recorded their video on magnetic tape, usually VHS or Beta format.   The used tape had to be ejected and a new one put in place every few hours or a “loop” tape was used.  When a loop tape reached the end of the tape, it simply continued over again on the beginning of the tape, re-recording over the original.

Today, CCTV camera systems are digital.  Instead of sending their video transmissions in analog type signals, they are sent in binary or digital form, usually in the form of bits or bytes, the same sort of digital segments used by personal computers.  The camera data is compiled into a digital video file which can either be stored on a hard drive disk or other storage media and/or viewed on a digital monitor.

Since the data is digital, many of the individual electronic components of a modern CCTV camera system are the same things used in personal computing.  For example, the computer Hard Disk Drive or HDD is the major constituent of the DVR storage.  A computer processor, much like the Central Processing Unit or CPU of a personal computer compiles the digital video files, controls and coordinates camera activity as well as playback and other DVR functions.

Since the original video security systems were analog and were called CCTV camera systems, there may be some confusion or crossover that exists today when describing digital video systems.  For example, analog CCTV cameras displayed their video on older CRT (cathode ray tube) type television monitors.  The CRT monitor displays a picture by rapidly projecting horizontal lines across the screen; the more horizontal lines per fixed vertical area, the greater the detail or resolution of the video.

Digital video is not displayed in horizontal lines, but as a series of horizontal and vertical dots called pixels.  These pixels may be circular or square in shape.  Generally speaking, the more pixels in a video for a fixed area, the greater the detail of the video because the dots are much smaller.  This allows for finer detail in the image.

So where’s the confusion?  Today you may still see CCTV camera systems that describe their clarity or detail or resolution of the camera in terms of Televsion Lines or TVL.  Yet other cameras may describe their resolution in terms of pixels.  For more information on determining the equivalencies of resolution for these systems see the articles in our knowledge base.

Since most of our monitors that are manufactured today are no longer CRT type but are more commonly LCD (liquid Crystal Display) or LED (Light Emitting Diode), it would see logical that over time, the TVL descriptor will eventually lose out to the more familiar digital “pixel” resolution (for example 720 X 340 pixels), but for the time being, it is well enough that you are aware that the difference exists.

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Video Security Camera Systems

Written By:
Thursday, March 10th, 2011

Nothing can provide better protection than video security camera systems.  Today’s systems can be “tailor built” to suit every individual need and with Internet availability you can have absolute control almost anywhere you go.  Security Camera King features several different video security camera systems in our on-line catalog of security equipment.

In the not to distant past, video security camera systems were tools that only a commercial or industrial business or a very wealthy household could afford.  That is no longer true, thanks to incredibly reduced prices, mostly attributed to the “digital revolution.”  As computer and electronic technology advances, components become smaller, more powerful, and less costly.  This holds true for the digital video security system industry as well.

In fact, not only have video security camera systems become smaller, more powerful, and less costly, but the components themselves are becoming like self contained mini-units which makes installation incredibly easy.  For most systems all that is needed is to mount the cameras and power supply, run the cables, and set up the Digital Video Recorder or DVR.  It has become so easy that you can install most complete systems as a do-it-yourself project in one weekend or less.

A standard video security camera system today consists of digital video cameras and a DVR.  Of course, many users prefer to use a full-time monitor to display the cameras’ images, but it is only truly necessary to set up the system.  After that, the monitor can be removed and the system can continue to operate with the settings you have chosen.

The operation of video security camera systems is pretty straight forward too.  The camera’s main function is to capture video (and audio if so equipped) and send it to the DVR.  The DVR stores the video and makes it available for viewing.  The monitor provides the means of output for the system; it displays the cameras’ captured video.

Are video security systems really that simple?  Well yes and no, but thanks to digital technology, the units can be constructed in such a way that the user doesn’t really need to concern himself or herself with the actual mechanism of function; they just need to make sure everything is placed (mounted) in the proper locations to make the system work.  The following is a closer look at how the video security camera system works.

We’ll begin with the digital video camera.  Inside each digital video camera is a sensor that can change light energy into measurable impulses of electricity.  There are two different sensors that function in two entirely different ways, yet produce the same end result, electronic video data.  The sensors are called a Charged Coupled Device or CCD and a Complementary Metal Oxide Semiconductor or CMOS.

After the sensor converts the light energy into electrical energy, that energy is sent through a series of on-board Integrated Circuit (IC) chips that interpret the electrical impulses.  These may include Digital Signal Processors or DSPs and analog-to-digital converter processors.  Once the data is prepared and digitized it is ready to leave the camera and travel to the DVR.

The DVR receives the digital video from the camera but it is in “raw” form, meaning it has not received fine tuning adjustments or the proper compilation of the data to create a digital video file.   The DVR has its own DSP and central processor that immediately begin to work on the data sent by the cameras.

The cameras’ data is analyzed and any fine tuning adjustments are made by the DVR.  Next, the DVR employs a COmpression/DECompression (CODEC) utility that has one specific purpose; the CODEC reduces the video image file to a fraction of the original size while maintaining a minimal loss of quality.

There are many different types of CODECs.  As technology improves, a newer CODEC is eventually produced, “out shrinking” digital video files as compared to the previous CODEC.  Security Camera King’s video security camera systems all use the latest and most efficient CODEC called “H.264.”  It provides maximum file reduction while maintaining video quality as much as possible.

After compressing the data the DVR creates a digital video file and saves it on its hard disk drive.  In addition, the DVR makes the file immediately available for viewing on a monitor.

If you are interested in purchasing a video security camera system, check out our on-line catalog or contact us by “Live Chat” or telephone and speak to one of our security experts today.

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