Posts Tagged ‘ CODEC ’

8 Camera Dvr

Monday, October 24th, 2011

The 8 camera Dvr system is a popular security system choice for applications requiring durable day and/or night indoor or outdoor security and surveillance.  There are many things to consider when purchasing an 8 camera Dvr system; so let’s examine a few.

First, the 8 camera Dvr system may also be referred to as an 8 channel Dvr system.  Usually, security camera systems refer to each camera as a “channel” hence the terms 8 channel system, 8 channel receiver, and so forth.

If you are using an 8 camera Dvr with outdoor cameras, the cameras must be an outdoor rated type.  This means they can withstand the forces of nature including extended inclement weather.  Cameras of this type are normally rated as IP66 or IP67.  This rating is the Ingress Protection rating based on an international electrical standard that specifies what the camera is protected against.  The first digit following the IP, in this case “6,” means the camera is dust tight, that no dust can enter the casing or components of the camera.  The second digit refers to the protection against water.  A rating of “6” means the camera is protected from ingress of powerful water jets and a rating of “7” means the camera could be submerged in water up to 1 meter in depth.

Generally, outdoor cameras will be either night/day vision cameras or infrared (IR) cameras.  Regardless of the type, this has no effect on the operation of the 8 camera Dvr.  Night/day vision cameras have a sensitive CCD sensor that can produce images in very low light conditions.  Infrared cameras contain a series of IR emitting LEDs that surround the camera lens to illuminate otherwise dark or no light conditions.  IR illumination is invisible to the human eye however the camera’s CCD sensor can detect IR radiation.  Therefore, the LEDs work like invisible lighting, flooding the absolutely dark target area with a beam of light undetectable to the human eye.

Also, an 8 camera Dvr system may utilize wireless camera technology.  This means that the cameras transmit their image to a receiver using either the 2.4 GHz or 5.8 GHz band without the need for transmission cables.  This can be incredibly beneficial in placing cameras in locations that are difficult to reach using cables or if the DVR is going in a concealed area.  A wireless 8 camera outdoor DVR system will also need an 8 channel receiver.

Regardless of the type of camera, this system will also include a Digital Video Recorder or DVR.   The DVR is basically the same device as the hard drive in a personal computer.  Once the camera has transmitted the signal to the system, the DVR stores the images or video in a file on the hard drive.  Generally, an 8 camera Dvr system will require a high speed DVR along with some sort of compression technology.

The compression technology is often called a CODEC, short for COmpression/DECompression utility.  Its job is to shrink the size of the enormous video file while maintaining good quality video images.  Security Camera King uses the latest most efficient CODEC available in their 8 camera Dvrs and it is known as H.264.

Since 8 cameras are producing video at once, the incredibly large file size of the digital video would exhaust the useful space of even the largest capacity DVRs.  So, file compression technology, software or hard-wired circuit boards, are used to compress the file size while maintaining the image quality while maximizing hard drive capacity.  The DVR saves the image until the disk is filled and when it reaches its capacity, the DVR continues recording over previously saved data.

One of the benefits of an 8 camera Dvr system is that it contains a CD/DVD writer.  These systems normally contain on-board or internal DVD writers.  These are excellent for backing up image files.  When a DVR is getting full, a DVD can be burned for archiving purposes before the DVR begins to re-write itself.  Also, another added benefit of a DVD writer is to produce back-ups or copies of certain image “footage” to provide to police departments or when needed as evidence.

Understanding the options available for an 8 camera outdoor DVR system with DVD recorder will help you make an educated, useful purchase that will fulfill your security and surveillance needs.  If you have any additional questions contact one of our security experts today.  We love to help!



Video Security Systems

Tuesday, March 29th, 2011

Video security systems are fast becoming the “wave” of the future.  Not only can they document events as they occur, but with Internet technology and other electronic technology advancements, they can even act as burglar alarms and alert you when possible illegal events occur.

A basic digital video security 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

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 rapid 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 DVR in a video security system creates, processes, and stores 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 security 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 video security 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.


Security Camera DVR

Monday, March 7th, 2011

The central controller as well as the storage for a digital video security system is the security camera DVR or Digital Video Recorder.  The DVR coordinates and controls the actions of the system as well as provides a central location for quick access of the recorded digital video files.  In this article, we will talk about the functions of the DVR and how it works.

A typical digital video security and surveillance system consists of up to three types of components; the digital video camera, the security camera DVR, and the system or spot camera monitor.  The camera’s main function is to capture light images and convert them into electronic images that can be sent to the DVR to be compiled, stored, and viewed.  The monitor’s function is to provide the display mechanism for viewing the electronic video.

But it is the security camera DVR that is responsible for tying all this together.  The DVR is basically a specialized computer with its video processing services on steroids.   The DVR has a central processor much like a personal computer, however the DVRs processor is specifically designed to deal with the data that is used to make video images, control cameras, store files, and display the images.

Most cameras have a special Integrated Circuit or IC chip called a Digital Signal Processor or DSP that is used to convert the electronic impulses sent by the sensor chip into video data.  However, the DVR also has its own dedicated DSP and central processing unit to handle the tasks needed to produce security video images.

First, the DVR must be able to accept multiple video data streams or bits simultaneously.  For example, most digital video security systems have more than one camera.  The DVR must be able to handle the video information being sent by as many cameras as it is designed for.  Think of the complexity involved when a personal computer uses a Webcam.  Many personal computers, until recently, didn’t have the computing resources to do anything else when the Webcam was in operation.  Now imagine using 4, 8, 16 or even 32 cameras at one time!

Further, the DVR doesn’t just receive the video data, but it must do something with it as well.  In fact, it must compile it, compress it, decompress it (for viewing) and store it all in just a few milliseconds.  It’s no wonder then, why a DVR is far superior to processing digital security video than say, a typical personal computer.

A security camera DVR creates a digital video file out of the data sent to it by the digital video camera.  The data that is created for just one camera is enormous.  For example, a digital video is actually in a simpler form, a series of digital photographs all stitched together.  When these photographs are played in front of the human eye at a fast enough rate, they fool the human eye and brain into thinking it is seeing fluid, motion video.

Typically, a security camera DVR produces high quality video at a rate of 30 frames per second or 30 fps.  That is 30 digital photographs taken within the time span of 1 second.  The information that is processed by the DVR at this rate just for one camera in one hour is 30 fps x 60 seconds x 60 minutes or 108,000 times the size of one digital photograph; if the DVR is a 16 channel DVR that jumps to 1,728,000 times.

The security camera DVR uses a utility called a CODEC which stands for COmpression/DECompression to shrink the digital file to a fraction of its original size while maintaining a minimal loss of quality.  This makes the file easier for the DVR to handle and requires less storage space to hold.  All of Security Camera King’s featured DVRs use the latest, most efficient CODEC known as H.264.

Once the file is compressed it is then made available by the DVR for viewing (live) or storing on the hard drive for future use.  Not until you consider all of the activity that is involved in creating digital video files for security systems can you really appreciate the high speed, intensive work performed by the security camera DVR.

In addition, the security camera DVR also acts as a fine tuner, relay station for other inputs, audio processor, and networking server.  The more channels a DVR processes the more expensive the unit because of the hardware and technology that is required to handle the job.


4 Channel Video Recorder

Thursday, February 17th, 2011

If you are looking for a high-quality dependable 4 channel video recorder, look no more. Security Camera King has three different models of 4 channel video recorders to choose from that can handle your every need.

We offer three different levels of digital video security recording with our Elite Mini HD, our Elite Series, and our Ultimate Series 4 channel video recorders. Each of our featured 4 Channel Video Recorders or Digital Video Recorders (DVRs) offers the following:
• H.264 CODEC. CODEC is an acronym for COmpression/DECompression utility. The CODEC shrinks digital video files size while maintaining a high quality image. The H.264 CODEC is the latest most efficient yet high-quality CODEC ever.
• Linux Operating System (OS). Each of our 4 Channel Video Recorders features an embedded Linux OS. This offers standalone versatility with stable dependability.
• HDMI, VGA, and 720P display options. Talk about versatility; our DVRs allow you to operate several monitors at the same time. Plus, our DVRs also provide HDMA, VGA, and BNC outputs.
• Easy setup and operation. Each 4 channel video recorder model uses an easy, intuitive Graphical User Interface and On-Screen Display. In addition 4 channels can be played back through the DVR and Internet simultaneously.
• IP ready. Our DVRs are Internet Protocol or IP ready with a built-in webserver. Not only can you view and control your system (including the cameras) via the Internet, but our DVRS also have the ability to automatically send you an e-mail based on a variety of triggers you choose. Further, our DVRs are fully accessible using 3G and 4G smartphones and we even offer FREE apps downloading.
• Easy PTZ (Pan-Tilt-Zoom) control. These 4 channel video recorders have state-of-the-art 3D mouse operated PTZ control. Just click and point and the camera follows your directions.
• Full 3 year warranty. The Elite Mini, Elite Series, and Ultimate Series DVRs carry a full 3 year warranty.

The Elite Mini HD 4 Channel Video Recorder
As noted above the Elite Mini DVR comes with many of the advanced features as the full sized Elite and Ultimate DVRs but at a more economical price. The Elite Mini cannot utilize an internal CD/DVD burner.

The Elite Series DVR 4 Channel Video Recorder
If an enterprise level recorder is what you’re looking for this can “fit the bill.” Our Elite series DVR not only has all the great features above, but this full-size DVR also supports multiple hard disk drives for extended storage capacity and can even accept an internal CD/DVD burner.

The Ultimate Series 4 Channel Video Recorder
This recorder is so named because it offers the ultimate in digital video security system recording. This unit not only has the features mentioned above but it records live at four times the quality or resolution of any other standalone DVR in the digital video security industry.

In addition to offering these three 4 channel video recorders, Security Camera King also has put together a total of six different complete digital video security camera systems at discounted prices. These systems consist of one of the three featured DVRs above plus your choice of four high-quality digital video security cameras, connectors, wiring, and power supplies all at one great low price. If that’s not enough, we allow you to mix and match cameras and other system devices in order to receive the discounted price of a system while having the ability to tailor-design it to fit your specific needs. (Some item changes may require a price adjustment).

Finally, Security Camera King will be there to assist you should you need it, when installing and setting up your system. Any one of our systems can be professionally installed but are also easy do-it-your-self projects.

If you have any additional questions or wish to make a purchase contact one of our online security experts via “Live Chat” or telephone at 866-573-8878 Monday through Friday from 9AM to 6PM EST. Security Camera King offers free shipping on every order over $500.


Motion Activated Recording

Thursday, February 10th, 2011

Conservation is the key term in reference to motion activated recording. In the following article, we’ll take a look at how digital video security and surveillance systems go about doing this and why conservation is a key term associated with this type of monitoring.

Digital video camera security systems can initiate motion activated recording in different ways. One of the most common ways to provide motion activated recording is to use a digital video camera with a built-in motion detector. Digital video security cameras equipped with motion detectors begin recording video when motion is detected and stop when motion is either no longer detected or after a designated (pre-programmed) time period.

The motion detector itself is called a PIR or Passive InfraRed sensor. This sensor constantly monitors the passive infrared signature of the camera’s field of vision. When a significant change in this infrared signature occurs (such as when a person, vehicle, or other object passes by) the PIR interprets this change in the infrared signature as motion.

The PIR sensor on motion activated recording cameras is electronically connected to a relay switch. When the PIR detects motion, the relay is energized to the “On” position which turns on the camera and begins the process of recording. When the infrared signature in the camera’s field of view becomes constant, the sensor interprets this as non-motion and the relay switch is then open, shutting the circuit to the camera off. (Many cameras have an intermediary circuit that is programmed to shut the camera off after a time delay in addition to or after motion is no longer detected.)

One of the biggest benefits of PIR motion activated recording is conservation of digital video security system resources. For example a typical motion activated recording system may have one or more motion activated digital video cameras, a Digital Video Recorder or DVR with a Digital Signal Processor or DSP, and an optional monitor. The DVR usually consists of a hard disk drive, like the one in most personal computers and in miniature systems may consist of SD cards, small Integrated Circuit (IC) chips, or other portable non-volatile media.

Even though technology advancements are yielding larger capacity and more efficient storage devices, regardless of the type of storage on the DVR, the capacity is still finite. Furthermore, the digital video files created by the cameras and stored on the DVRs are extremely large files. To keep file sizes as small as possible without losing significant quality, COmpression/DECompression or CODEC utilities are used. These utilities may be in the form of software or a hard-wired IC chip.

CODECs greatly improve the storage capacity of any given drive, conserving on system memory. This is important because whenever storage capacity is reached, the newest digital video files are re-recorded over older digital video files. If the files are archived before hand the data could be lost. There are several ways of improving efficiency in addition to using a CODEC. A larger capacity storage medium can also increase re-recording loop times, handle multiple camera recordings at once, and provide storage space for software programs and other necessary binary information.

Another way to greatly improve the storage capacity and efficiency of the camera-DVR relationship is to only record what is necessary. PIR motion activated recordings or PIR motion detector cameras do exactly that. By recording video only when motion is detected, a tremendous amount of memory on the storage medium is conserved. For some applications, motion detection would only be detected if there is a breach in security (banks and retail stores after hours for example) and this could mean no need to record for days or even months.

Memory is not the only resource that is conserved by motion activated recording cameras. Many users these days prefer the use of totally wireless cameras. These cameras send their digital video data via radio signals to a corresponding receiver that is connected to the DVR or to a DVR with a built in receiver. However, these cameras still require a power source which indicates the use of some sort of power supply carried by a wire to the camera – unless the camera is battery operated.

Battery operated cameras may use standard one-time use batteries or rechargeable batteries. Regardless of the type of battery, motion activated recording drastically conserves battery power as the PIR sensor demands a very small drain on the camera batteries as does digital video recording.