Digital CCTV : a security professional's guide by Emily M. Harwood

By Emily M. Harwood

The results of electronic expertise at the safety require consistent vigilance by way of defense vendors, revenues employees, and install pros. this present day and for the foreseeable destiny, all defense pros should have no less than a easy knowing of electronic know-how. electronic CCTV addresses this new problem. subject matters convered comprise compression variables similar to Lossless and Lossy, that are defined via reviewing Huffman and Run size Encoding (RLE), and by means of touching on those sorts of compression to ZIP and Stuffit, that are frequent 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 also be supplied. As electronic CCTV strains the move of electronic video move from the pc via compression, transmission, demonstrate 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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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.

Larger amounts of bytes are described with the prefixes Mega, Giga, Terra, Peta, Exa, Zetta and Yotta, which sounds a lot like something out of a Star Wars movie! These become Megabyte, Gigabyte, and so on. Even shorter descriptives are derived from using singles letters as in K, M and G, written Kbytes, Mbytes, and Gbytes or KB, MB, and GB. See Table 2-5. 24 Digital CCTV Table 2-5 Numeric Abbreviations Name Abbreviation Kilo Mega Giga Terra Peta Exa Zetta Yotta K M G T P E Z Y Size 2∧10 2∧20 2∧30 2∧40 2∧50 2∧60 2∧70 2∧80 = = = = = = = = 1,024 1,048,576 1,073,741,824 1,099,511,627,776 1,125,899,906,842,624 1,152,921,504,606,846,976 1,180,591,620,717,411,303,424 1,208,925,819,614,629,174,706,176 You can see from this chart that Kilo is about a thousand, Mega is about a million, and Giga is about a billion, and so on.

5 MHz, four times the fundamental sampling rate. 75 MHz, two times the fundamental sampling rate. To complete the conversion, each sample is represented by a discrete number in a process known as quantizing. A discrete unit has no part; in other words, if it is divided the result is no longer a unit. For example, there is no such thing as half a person, so people are counted in discrete numbers. Ten people can be divided only in half, fifths, and tenths, but if you try to divide them into thirds you will receive loud complaints!

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