By Emily M. Harwood

ISBN-10: 0750677457

ISBN-13: 9780750677455

The consequences of electronic expertise at the safety require consistent vigilance by way of safeguard vendors, revenues employees, and set up execs. this present day and for the foreseeable destiny, all safeguard execs should have not less than a uncomplicated figuring out of electronic know-how. electronic CCTV addresses this new problem. themes convered comprise compression variables reminiscent of Lossless and Lossy, that are defined through reviewing Huffman and Run size Encoding (RLE), and by way of referring to those different types of compression to ZIP and Stuffit, that are everyday in own desktops. A overview of JPEG, movement JPEG, MPEG and wavelet compression schemes between others, with a comparability of the benefits of every, can be supplied. As electronic CCTV lines the circulate of electronic video move from the pc via compression, transmission, reveal 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 technological know-how.

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The small circles represent sample points. 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?

42 Digital CCTV THE OPTICAL ILLUSION The process of transmitting a moving picture is dependent upon an optical illusion that makes a series of still pictures seen in rapid succession appear to be in motion. The first step in creating this illusion is to transmit one still picture or one frame of video. As discussed in chapter one, a still picture or frame of video consists of two scans containing 525 alternate horizontal lines. 5 odd numbered lines. 5 even numbered lines. 5 lines is one “field” of video.

Once again, this leads to the issue of bandwidth needed to move digital information. What Exactly is Digital Video? 33 WHAT ABOUT GRAY? Images made by a black-and-white video camera contain more than simple black or white dots. Black-and-white video images are comprised of black, white, and many shades of gray—as seen in Figure 2-10. In order to convert shades of gray into numerical values for digitizing an image, we must define the shades of gray between black and white. Earlier in chapter one, Figure 1-6 portrayed a 10-step grayscale chart and the video waveform that results from one scan line of the chart by a video camera.

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Digital CCTV A Security Professionals Guide by Emily M. Harwood


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