By Emily M. Harwood
The results of electronic expertise at the defense require consistent vigilance through defense vendors, revenues employees, and set up pros. at the present time and for the foreseeable destiny, all protection execs should have not less than a uncomplicated knowing of electronic know-how. electronic CCTV addresses this new problem. issues convered comprise compression variables resembling Lossless and Lossy, that are defined by way of reviewing Huffman and Run size Encoding (RLE), and via concerning those kinds of compression to ZIP and Stuffit, that are known in own pcs. A overview of JPEG, movement JPEG, MPEG and wavelet compression schemes between others, with a comparability of the advantages of every, is additionally supplied. As electronic CCTV strains the move of electronic video stream 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 examine and comprehend the mysteries of electronic technology.
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Additional info for Digital CCTV: A Security Professional's Guide
The function of the control track is similar to the sprocket holes in motion picture film. Control track pulses keep the tape moving from the supply reel to the take up reel at a constant speed. Control track pulses are recorded on the tape along with the video and the audio. During playback, the control track pulses are read and compared to a reference 60-cycle signal to keep the tape motion constant. The control track signal is often generated from the vertical sync of the video being recorded.
Figure 2-12 Electromagnetic Spectrum What Exactly is Digital Video? 37 NTSC standards have not changed significantly since their establishment, except for the addition of new strictures for color signals. NTSC signals are not directly compatible with computer systems. The NTSC standard for television defines a composite video signal with a refresh rate of 60 half-frames per second. Each frame contains 525 lines and can contain 16 million different colors. Composite video is the format of an analog television signal before it is modulated onto an RF carrier.
Since you only have two possible switch combinations or electrical possibilities, the computer only needs various combinations of two digits to represent numbers, letters, or pixels. These two digits are visually represented by 1s and 0s. In the digital world we call these electrical impulse representations bits, or binary digits. We also have bytes, which are made up of eight bits. See Figure 2-1. Figure 2-1 Eight Bits Make One Byte What Exactly is Digital Video? 21 The easiest way to understand bits is to compare them to something you are already familiar with, such as digits.
Digital CCTV: A Security Professional's Guide by Emily M. Harwood