Digital CCTV A Security Professionals Guide by Emily M. Harwood

By Emily M. Harwood

The consequences of electronic expertise at the defense require consistent vigilance by means of protection vendors, revenues employees, and deploy pros. at the present time and for the foreseeable destiny, all protection execs should have not less than a uncomplicated realizing of electronic know-how. electronic CCTV addresses this new problem. themes convered contain compression variables reminiscent of Lossless and Lossy, that are defined through reviewing Huffman and Run size Encoding (RLE), and through referring to those types of compression to ZIP and Stuffit, that are regularly occurring in own desktops. A assessment of JPEG, movement JPEG, MPEG and wavelet compression schemes between others, with a comparability of the advantages of every, can be supplied. As electronic CCTV strains the circulation of electronic video move 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 study and comprehend the mysteries of electronic technology.

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Next, advances in wireless communications provided unprecedented mobility to surveillance applications. All of these advances in technology are possible because of video digitalization. One of the important things to grasp about digital video is that it is simply an alternative way of carrying the same video information as an analog system. Digital video is a series or string of numbers that represent the voltage levels of an analog video signal. An ideal digital system has the same characteristics as an ideal analog system; both are completely transparent and reproduce the original applied waveform without error.

CREATING THE IMAGE A computer-created image consists of many points of color called picture elements, or pixels. A pixel is the smallest element of a picture or image. 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.

Without the original highresolution image as a reference, it would be difficult to determine what this illustration is. The resolution is so low that it makes it difficult to see the mouth or the line where the chef’s hat joins the head. Figure 2-6 High Resolution What Exactly is Digital Video? 31 Figure 2-7 Six Dots Per Inch Figure 2-8 Twelve Dots Per Inch Figure 2-8 is the same image again at twice the resolution as Figure 2-7 or 12 dpi. It is a little easier to see that the picture is of a face with some sort of hat on it.

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