By Emily M. Harwood
The consequences of electronic expertise at the safeguard require consistent vigilance by way of defense vendors, revenues employees, and deploy execs. at the present time and for the foreseeable destiny, all safeguard execs should have a minimum of a uncomplicated figuring out of electronic expertise. electronic CCTV addresses this new problem. issues convered comprise compression variables similar to Lossless and Lossy, that are defined by way of reviewing Huffman and Run size Encoding (RLE), and via bearing on those types of compression to ZIP and Stuffit, that are regular in own pcs. A evaluation of JPEG, movement JPEG, MPEG and wavelet compression schemes between others, with a comparability of the benefits of every, is additionally supplied. As electronic CCTV strains the movement of electronic video movement from the pc via compression, transmission, show and garage, and explains how analog video sign is switched over right into a electronic sign, the reader will research and comprehend the mysteries of electronic technological know-how.
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Additional info for Digital CCTV: A Security Professional's Guide
When Ethernet and TCP/IP standards were developed, network-based applications became viable. Next, advances in wireless communications provided unprecedented mobility to surveillance applications. All of these advances in technology are possible because of video digitalization. One of the important things to grasp about digital video is that it is simply an alternative way of carrying the same video information as an analog system. Digital video is a series or string of numbers that represent the voltage levels of an analog video signal.
This page intentionally left blank 3 In the Beginning Since the beginning of time, humanity has had an insatiable desire to communicate distances that are beyond the range of unaided hearing or sight. One of the earliest devices used in an attempt to transmit video was the Nipkow disk named for its inventor, Paul Nipkow. The Nipkow disk consisted of a circular disk with a spiral of holes cut into it. These holes were positioned so that they could scan every part of an image as it spun around. Light coming through the disk was translated to an electrical current that caused a second light to appear at the opposite end of a wire.
5 MHz, four times the fundamental sampling rate. 75 MHz, two times the fundamental sampling rate. To complete the conversion, each sample is represented by a discrete number in a process known as quantizing. A discrete unit has no part; in other words, if it is divided the result is no longer a unit. For example, there is no such thing as half a person, so people are counted in discrete numbers. Ten people can be divided only in half, fifths, and tenths, but if you try to divide them into thirds you will receive loud complaints!
Digital CCTV: A Security Professional's Guide by Emily M. Harwood