Download Digital CCTV - A Security Professional's Guide by Emily M. Harwood PDF

By Emily M. Harwood

The consequences of electronic expertise at the safety require consistent vigilance via protection vendors, revenues employees, and deploy pros. at the present time and for the foreseeable destiny, all safety pros should have at the very least a simple realizing of electronic expertise. electronic CCTV addresses this new problem. issues convered comprise compression variables equivalent to Lossless and Lossy, that are defined by means of reviewing Huffman and Run size Encoding (RLE), and through touching on those kinds of compression to ZIP and Stuffit, that are well-known in own desktops. A evaluation of JPEG, movement JPEG, MPEG and wavelet compression schemes between others, with a comparability of the benefits of every, is usually supplied. As electronic CCTV lines the circulation of electronic video circulation from the pc via compression, transmission, reveal and garage, and explains how analog video sign is switched over right into a electronic sign, the reader will examine and comprehend the mysteries of electronic technology.

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This is called the Nyquest theory. The sampling rate or number of samples per second is several times the maximum frequency of the analog waveform in hertz (Hz). In the United States, common household electrical supply is at 60 hertz. Broadcast transmission is at What Exactly is Digital Video? 25 much higher frequency rates, usually expressed in kilohertz (KHz) or megahertz (MHz). The result of sampling a video signal is digital video. There are many ways to accomplish sampling. 601, more commonly known as CCIR 601.

The difficulty involved in creating this optical illusion arises in transferring enough frames at a fast enough rate to perceive not just motion but fluid motion. Here is a simplified explanation of how the speed of still frames influence the illusion of motion: Let’s assume we are viewing a dog on one side of a large fence. See Figure 3-2. Presuming our frame rate is too slow to achieve the illusion of fluid motion, our next picture might show the dog on the other side of the fence. See Figure 3-2.

Radio waves are the electromagnetic waves with the longest wavelengths and the lowest frequencies. See Figure 3-6. Microwaves Microwaves are very short waves of electromagnetic energy that travel at the speed of light. Microwaves are good for transmitting information from one place to another because microwave energy can penetrate haze, light rain and snow, clouds, and smoke. Radar uses microwave radiation to detect range, speed, and other characteristics of remote objects. Microwaves, used for radar, are just a few inches long.

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