By Emily M. Harwood
The results of electronic expertise at the protection require consistent vigilance via safety vendors, revenues employees, and set up execs. this present day and for the foreseeable destiny, all defense pros should have at the least a uncomplicated realizing of electronic expertise. electronic CCTV addresses this new problem. themes convered contain compression variables corresponding to Lossless and Lossy, that are defined via reviewing Huffman and Run size Encoding (RLE), and by means of concerning those sorts of compression to ZIP and Stuffit, that are conventional 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 additionally supplied. As electronic CCTV strains the circulation of electronic video circulate 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 research and comprehend the mysteries of electronic technology.
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Extra resources for Digital CCTV : a security professional's guide
In fact, a very good way to understand analog and digital video technologies is to consider them as two different languages. Everyone must learn a language as a child and some people even grow up learning more than one language. We may later choose to learn more languages, which require a certain amount of time and concentration because it is not what we are used to. In the electronic industry most of us learned analog as our basic language. Now in order to understand and communicate with the digital language, we must take the time to learn it.
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. It should be clear that Figure 2-10 Shades of Gray 34 Digital CCTV Figure 2-11 Table 2-6 Shades of Gray in Steps Number of Bits Needed To Make Each Picture Dots per row Number of rows Total dots Number of bits Fig.
Figure 1-9 illustrates multiple cameras connected to a single monitor via a simple rotary switch. THE IMPORTANCE OF SYNCHRONIZING When a camera is turned on, its synchronizing (sync) generator begins to make horizontal and vertical retrace pulses, or sync pulses. As several cameras are turned on, even if they are all turned on at the same time, each camera’s sync pulse generator runs to its own beat. This means that the horizontal and vertical sync pulses for each camera are occurring at different times.