Posts Tagged ‘ ip camera dvr’



DVR for IP Camera

Written By:
Wednesday, September 14th, 2011

When talking in security and surveillance camera system circles, you may have heard “DVR for IP Camera” mentioned.  That’s understandable because these systems are becoming very popular these days very fast.  In the following article will explain what all the abbreviations mean, how a typical system works verses a DVR for IP camera, and what an NVR is.

First, let’s talk about a non-IP or non Internet Protocol security camera system.  This system typically consists of digital video cameras (non-IP), a Digital Video Recorder or DVR, and one or more monitors.  In simple terms, the cameras are needed to capture the video image, the DVR records the images, and the monitor displays them.

A more “in-depth” view includes the following.  The camera lens gathers the light reflected off objects in its field of view and focuses that field of view on to a very small sensor chip (often 1/4 or 1/3 inch square).  There are actually two different types of sensor chips but only one is needed to do the job.  One type is called a Charged Coupled Device or CCD and the other is a Complementary Metal Oxide Semiconductor or CMOS.   Although they go about it somewhat differently, both chips yield the same end product:  They change the light energy from the lens into electronic impulses that can be used to create video images.

The camera translates the impulses into an electronic image and then digitizes it.  Ironically enough, a digital camera actually creates an analog image that must be converted to binary (digital) code before it leaves the camera.  It may also contain other specialized Integrated circuit chips that enhance the image and correct any flaws.  These special chips are called Digital Signal Processors or DSPs.

Once the signal is prepared to leave the camera it is sent along a co-axial video transmission cable such as RG-59 to the DVR.  Some systems are “wireless.”  Wireless systems include a camera with a built in transmitter and antenna.  Instead of sending the signal along a cable, the camera changes it into a radio signal that is sent to a corresponding receiver that is connected to the DVR.

Once the signal reaches the DVR, it is processed further.  A COmpression/DECompression or CODEC is employed to reduce the incredibly large size of the file without sacrificing a large amount of quality.  The DVR then stores the file on its Hard Disk Drive for later viewing or archiving purposes.  If a monitor is used, it also provides it with the finished signal.

In contrast, a DVR for IP camera system basically uses the Internet as the vehicle of transmission for the video image.  It may also send the image over cable directly to the DVR simultaneously.  The camera also has a built in web server and prepares the signal for both the Internet and the direct link to the DVR using one or more CODECs.  A popular method is to use the latest CODEC for streaming directly over the Internet, H.264, and for saving to the recorder MJPEG.

DVR for IP camera systems do not necessarily require a DVR to work.  The camera sends the signal over the Internet and the user/receiver uses a standard Internet browser to display the image.  If a recorded image is needed, the browser can save it to the personal computer on which the video image is being viewed.

The key advantage to using an IP camera over a non-IP camera is that cameras can be located thousands of miles apart and still be on a networked system.  As long as there is access to broadband Internet the IP camera can use the Internet as it would a transmission cable and pipe its data to just about anywhere.

Although the IP camera may be able to work alone, most systems will be of the DVR for IP camera type.  Before we end this article we should make it clear that when dealing with IP networking systems, the DVR is usually called a Network Video Recorder or NVR and it does operate a little differently than a DVR.

However, just the same, the NVR on a DVR for IP camera system is for storage of all the cameras’ video images and for central control of the system.

If you would like more information on a DVR for IP camera system, please contact one of our security experts as they will be glad to help.

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IP Camera DVR

Written By:
Tuesday, August 9th, 2011

IP (Internet Protocol) camera DVR’s (Digital Video Recorders), also known as Network Video Recorders or NVRs are becoming more popular everyday. These devices combine the high quality digital video security system with the Internet to yield a powerful networking system that has no limitation in distance, provided there is a broad band Internet connection. This even includes 3G and 4G smartphones.

A typical non-IP camera DVR system has one to many cameras, a DVR, and usually at least one monitor. The camera is responsible for “capturing” the video image while the DVR stores the data that the camera sends it or makes it readily available to the monitor for live viewing.

The camera has a few Integrated Circuit (IC) chips on board that refine the image and convert it from analog to digital format. For the purpose of this article, the next step is extremely important: The camera usually sends it video data to the DVR by using a video transmission cable which is connected directly between the two. There are also wireless systems where the camera sends its data via radio waves to a nearby receiver which is directly connected to the DVR. At any rate, the cameras and DVR must be within a certain distance of each other either due to the limits of the wireless transmitter or the length of the video transmission cable.

In the above example, the DVR may be connected to the Internet allowing the user to view and control the security cameras over the Internet, but full control, viewing, and coordination is actually going on in the DVRs on-board web server technology and not through the individual camera.

An IP camera DVR works a little bit differently. As far as their function is concerned the IP cameras work and do the same tasks that the non-IP cameras do. However, instead of communicating with the DVR via a video transmission cable, they have their own on-board circuitry that allows them to use the Internet as the vehicle for networking.

 

An IP camera usually has the capability of sending two or more different instances of the video image over the Internet at one time. One instance uses a streaming CODEC for live viewing and the other instance used a different CODEC for preparing the file for storage on the IP camera DVR’s hard drive. CODEC is an acronym for COmpression/DECompression. Digital video files can be extremely large and difficult to handle. The CODEC’s job is to shrink the size of the digital video file while maintaining the integrity and quality of the image.

 

For example many IP camera DVRs use the MJPEG CODEC to record the digital video file. The camera may also send off a streaming file over the internet for live monitoring. One of the latest and most efficient CODECs for this use is called the H.264 CODEC.

 

So the IP camera DVR or NVR has the function of recording and communicating with the IP cameras. Unlike the standard digital video camera, IP cameras do not have a digital video transmission cable. Instead, they connect to the Internet, usually via CAT5 Ethernet cable. Some cameras are even PoE ready, which means they are able to get their “Power Over the Ethernet” instead of some other method.

 

IP camera DVR’s or NVR’s resemble personal computers in looks. In stead of each individual camera connecting to the DVR via transmission cables, the NVR only needs one connection: A broadband Internet connection.

 

Security Camera King offers several NVR’s or IP camera DVRs for purchase. Our NVRs are state-of-the-art and are built right on our premises. We have three different NVRs available based on the number of channels that it can operate. We offer 8, 16, and 32 channel units and each of these is available in either the Deluxe Series or the Pro series. All units come with Windows 7 and V eilux software pre-installed.

 

The Pro series NVR is compatible with a wide range of IP cameras and is custom designed for use for several brands of IP cameras and can be used where cameras are located in more than one geographical location. Using client software, multiple locations can be tied together (for monitoring by a security guard for example). The Deluxe Series NVR or IP camera DVR is compatible only with Veilux IP cameras and is intended for use where there is only one physical location in use.

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