Thursday, August 30, 2007

Video compression for DVR in CCTV systems

DVR stands for Digitals Video Recorder. Advantage of using a DVR technology over analog recording is that the Digital Data recorded by DVR can be compressed and saved in special hard disk and can be reviewed later. Video compression plays an important role in overall operation, properly compressed video can also save disk space.
All DVRs use some kind of compression algorithm called a codec to keep the digital video files at a manageable size. The average size of an uncompressed still image frame at 320x240 resolution in 24-bit true color is about 230400 Byte or 2.3 Mega Byte. Same image frame in 32 bit color is about 307200 Byte or 3.07 Mega Byte.

An hour’s worth of one channel of uncompressed video at 25 frames per second would take up 21,600 megabytes (21.6 GB)

Uncompressed video of one hour will take hard disk space

Frame size 320*240 Pixel at 25 frames per second would take up
25*3600* 230400 Byte = 20736 Mega bytes
= 20.736 GB (24 bit color)
25*3600* 307200 Byte = 27648 Mega bytes
= 27.648 GB (32 bit color)

Get CCTV technology in India from Digitals India. Visit

Tuesday, August 21, 2007

Audio Video door entry explained

av door entry system ensures your safety, safeguard your home and can be linked to alarms.

Audio video door entry system comprises of a audio or video outer panel with a bell or the camera unit which is installed outside the gate or the door , a monitor or phone from which we can communicate with the visitor- these can be audio or video door phones.
This can be teamed up with accessories like electric lock release, telephonic unit etc

Apart from this we need a system through which device communicate to each other.
All these needs a perfect system integration and full customization for your requirement.

Digitals india offers you FERMAX range of audio video door entry systems in India. FERMAX is one of the most reputed company worldwide for audio video door entry phones.

Tuesday, August 14, 2007

How to ensure home security?

Home security is as important as home itself. There are three steps of security- prevention, detection and post investigation in case of unfortunate event.
It would not be contradicted if we agree that the foremost importance is the step one: prevention.Following measures can help us prevent such events

Physical and electronic barriers must be introduced.
Physical barriers - Deter and slow the entry of criminals into a restricted area.
Outside chain link fences.
Exceptionally strong doors.
Quality mechanical locks.
Appropriate inside and outside lights.
Audio video door entry systems- to restrict entry


Sunday, August 12, 2007

What are prime requirements for CCTV system?

Prime requirements for CCTV system are-
Product Reliability and robustness.
User friendly operation.
High resolution & Good quality images.
High compression ratio to save hard drive space and band width.


Saturday, August 4, 2007

What makes a good images in CCTV ?

Following factors determine the quality of images in CCTV systems-
Proper selection of good quality lens
Lighting Conditions
Resolution and Quality of camera
Placement of camera
Video compression technology
Information source: digitals India

Does CCTV makes you really secure?

The answer will be No. The most measurable effect of CCTV is not on crime prevention, but on detection and prosecution. CCTV reduce or deter crime. Shopowners and factory owners can benifit by constant surviellance on their premises. CCTV also bring about a psychological fear among the people that they are being watched.

CCTV is a boon in post incident investigations. But in some cases in has been seen that the equipment used for recording the incident was so poor that it was difficult to identify the thief recorded through CCTV.

Good quality images and superior technology in recording and storage are of prime importance in the system.

Read more on about latest products and technology.


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