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

By Emily M. Harwood

The results of electronic expertise at the protection require consistent vigilance by means of safeguard vendors, revenues employees, and set up execs. this present day and for the foreseeable destiny, all defense pros should have at the least a simple knowing of electronic know-how. electronic CCTV addresses this new problem. themes convered contain compression variables corresponding to Lossless and Lossy, that are defined by means of reviewing Huffman and Run size Encoding (RLE), and by means of bearing on those different types of compression to ZIP and Stuffit, that are popular in own desktops. A evaluate 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 movement 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 research and comprehend the mysteries of electronic technology.

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This makes counting in binary pretty simple. Table 2-3 provides a different view of how binary counting works. This view may make it easier to see how decimal and binary numbers are related. When you look at the binary numbers as they increment from 0 to 10, you will see a pattern. The bit on the extreme right toggles off, on, off, on, and so on. The second bit from the right, the second bit, toggles every second increment, off, off, on, on, off, off, on, on, and so on. Because there are eight bits in a byte, we can represent 256 values ranging from 0 to 255.

Table 2-4 128 0 64 0 23 Counting Bits 32 0 16 1 8 1 4 0 2 0 1 0 plus one (8), plus zero (4), plus zero (2), plus zero (1) add up to 24 or 16 + 8 = 24. It may sound a bit confusing at first, but once you catch on it is really very simple. 256 values ranging from 0 to 255 are shown here: 0 = 00000000 1 = 00000001 2 = 00000010 254 = 11111110 255 = 11111111 As previously mentioned, a group of eight bits is called a byte. This convention has evolved over the history of binary numbers. It is important to note that some devices provide digital performance information in bits, and some in bytes.

19 20 Digital CCTV Remember the waves from chapter one? That information is now being translated into a digital language, so to speak. 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.

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