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

By Emily M. Harwood

The results of electronic know-how at the protection require consistent vigilance through protection vendors, revenues employees, and install execs. at the present time and for the foreseeable destiny, all protection execs should have a minimum of a simple knowing of electronic expertise. electronic CCTV addresses this new problem. issues convered comprise compression variables equivalent to Lossless and Lossy, that are defined through reviewing Huffman and Run size Encoding (RLE), and through touching on those different types of compression to ZIP and Stuffit, that are general in own desktops. A evaluation of JPEG, movement JPEG, MPEG and wavelet compression schemes between others, with a comparability of the advantages of every, is usually supplied. As electronic CCTV strains the circulate of electronic video movement from the pc via compression, transmission, demonstrate 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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97 frames per second on television broadcasting. There are three dominating video standards in use around the world, NTSC, PAL, and SECAM. These three formats have developed in different parts of the world for historic reasons. The PAL standard involves the scanning of 625 lines per frame and utilizes a wider channel bandwidth than NTSC. PAL, which stands for Phase Alternating Line, was introduced in the early 1960’s and was implemented in most European countries except for France where the standard is SECAM (Sequential Couleur Avec Memoire or Sequential Color with Memory), also introduced in the 1960’s.

Sample points are the points at which the voltage is measured and converted into a binary number that represents the voltage level of the signal at that point. Notice that each of the samples is taken at equal time intervals. The stepped, straight-line figure in black is the digital equivalent of the sine wave reconstructed from the measurements taken at the sample points. When you look at Figure 2-5A, you can see that the digital equivalent of the sine wave is a square wave that suggests an What Exactly is Digital Video?

The search for a solution to this expensive necessity guided business leaders to the advantages of teleconferencing as a communications alternative, and this growing market for remote video products stimulated further research. Manufacturers who realized a potential market for remote video as a security surveillance product began adding their resources to the mix, along with visionaries from the world of medicine who understood the possible advantages of rapidly sending images long distances. The race was on!

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