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

By Emily M. Harwood

The results of electronic expertise at the defense require consistent vigilance through safeguard vendors, revenues employees, and install pros. this present day and for the foreseeable destiny, all defense pros should have at the least a simple realizing of electronic know-how. electronic CCTV addresses this new problem. subject matters convered contain compression variables comparable to Lossless and Lossy, that are defined by means of reviewing Huffman and Run size Encoding (RLE), and by means of concerning those kinds of compression to ZIP and Stuffit, that are frequent in own pcs. A assessment 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 lines the move of electronic video movement from the pc via compression, transmission, exhibit 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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Example text

As a result, during playback, the picture often tears or distorts badly when the video recorder is playing between one camera and the next. Most video cameras provide a solution for synchronization, which allows the sync pulses to line up in time either by using a We Live in an Analog World 17 synchronizing generator or by a circuit in the camera. A synchronizing generator produces horizontal and vertical synchronizing pulses that are supplied to a number of cameras. The cameras use the sync signal from the synchronizing generator to time their horizontal and vertical scans.

The result of sampling a video signal is digital video. There are many ways to accomplish sampling. 601, more commonly known as CCIR 601. ITU stands for the International Telecommunications Union, an organization established by the United Nations with members from virtually every government in the world. The ITU’s mission is to set telecommunications standards and allocate frequencies for various uses around the world. 375 MHz sample rate. This sampling rate has been carefully chosen because of its relationship to both NTSC and PAL.

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. SECAM uses the same bandwidth as PAL but transmits color information sequentially.

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