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

By Emily M. Harwood

The consequences of electronic expertise at the protection require consistent vigilance by means of safety vendors, revenues employees, and install pros. this present day and for the foreseeable destiny, all protection pros should have a minimum of a simple figuring out of electronic expertise. electronic CCTV addresses this new problem. issues convered contain compression variables equivalent to Lossless and Lossy, that are defined through reviewing Huffman and Run size Encoding (RLE), and by means of bearing on those kinds of compression to ZIP and Stuffit, that are commonplace in own pcs. A evaluation of JPEG, movement JPEG, MPEG and wavelet compression schemes between others, with a comparability of the advantages of every, can also be supplied. As electronic CCTV lines the flow of electronic video stream 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 technological know-how.

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Extra resources for Digital CCTV - A Security Professional's Guide

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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. This light passed through a second disk, which was spinning at the same speed as the original, causing a picture to be projected onto a screen. The Nipkow disk may seem very primitive now, but in its day it truly seemed like magic!

Graphics monitors display pictures by dividing the display screen into thousands (or millions) of pixels, arranged in rows and columns. Pixels are so close together that they appear to be connected. To help understand this, consider the make up of a tapestry. One of the earliest forms of depicting scenes, it is actually very similar to the method of creating digital pictures. A tapestry is nothing more than fabric woven from threads of different colors that form a picture or design. The scene on a tapestry consists of vertical and horizontal threads of varying shades and sizes, which form the finished image.

The color signal is called a chroma-burst and must be accurately transmitted to the receiving end with no loss of information. The chrominance portion of the signal tells a video display what color to reveal. The luminance value adjusts the color to light or dark, bright or shadowed in order to provide the correct contrast and color depth. Chrominance is abbreviated with the letter C, and we already know that luminance is abbreviated with the letter Y. A chrominance signal requires the transmission of extra data, which accounts for the larger data file related to color.

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