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

By Emily M. Harwood

The results of electronic expertise at the defense require consistent vigilance through safety vendors, revenues employees, and set up execs. at the present time and for the foreseeable destiny, all protection pros should have not less than a simple realizing of electronic know-how. electronic CCTV addresses this new problem. themes convered contain compression variables resembling Lossless and Lossy, that are defined by way of reviewing Huffman and Run size Encoding (RLE), and by way of touching on those types of compression to ZIP and Stuffit, that are commonplace in own pcs. A evaluate of JPEG, movement JPEG, MPEG and wavelet compression schemes between others, with a comparability of the benefits of every, is usually supplied. As electronic CCTV strains the movement of electronic video movement 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 examine and comprehend the mysteries of electronic technology.

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In the decimal counting system that we use every day there are placeholders defined by commas, which tell us how many units we are describing with a given number. See Table 2-1. For example, the number 1000 consists of one thousands, zero hundreds, zero tens and zero units (ones). What if the placeholders had a different meaning? What if the placeholders meant this? See Table 2-2. Table 2-1 Tens of Millions Base of Ten Millions Table 2-2 Hundreds of Thousands Tens of Thousands Thousands Hundreds Tens Units 1 0 0 0 Base of Two Decimal number Binary number 128 64 32 16 8 1 4 0 2 0 1 0 22 Digital CCTV Table 2-3 Binary Counting Decimal Number 0 1 2 3 4 5 6 7 8 9 10 Binary Number 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 Notice that as you read from right to left, the decimal value of the placeholder doubles.

Unfortunately, synchronizing generators can add substantial cost to a video system. The sync generator itself is a cost and each camera in a system requires at least one coaxial cable, sometimes two, from the sync generator in addition to the coaxial cable that carries the composite video back to the switcher. For this reason, sync generators are seldom used in CCTV systems. Since almost all of the cameras in a CCTV system use either primary Alternating Current (AC) power or low voltage AC power, and since both primary AC and low voltage AC have a 60-cycle alternating current, the AC itself can be used as a cheap synchronizing source.

In this case, 1000 would mean eight because the column representing eight has an “on” value and the remaining numbers all have an “off” value. One (8), plus zero (4), plus zero (2), plus zero (1). Using this reasoning, the binary number 1001 would represent the number nine. One (8), plus zero (4), plus zero (2), plus one (1). 1010 would represent the number ten. One (8), plus zero (4), plus one (2), plus zero (1) or eight plus two equals ten. You should begin to see that when using binary numbers, each bit holds the value of increasing powers of two.

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