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 www.digitalsindia.com/cctv.html

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.