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

By Emily M. Harwood

The consequences of electronic know-how at the safety require consistent vigilance by means of protection vendors, revenues employees, and deploy execs. this day and for the foreseeable destiny, all safeguard pros should have not less than a easy figuring out of electronic expertise. electronic CCTV addresses this new problem. issues convered contain compression variables similar to Lossless and Lossy, that are defined via reviewing Huffman and Run size Encoding (RLE), and via pertaining to those types of compression to ZIP and Stuffit, that are normal in own desktops. A assessment 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 movement of electronic video move 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 technological know-how.

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Think of each dot in a picture as a light bulb with black representing off and white representing on. How many dots does it take to make a picture? This question leads to an understanding of resolution. Figure 2-6 illustrates a simple sketch of a face with a cook’s hat on a black background. The image here is clear and crisp. The line where the hat meets the head is smooth and straight with no jagged edges. The curves are smooth as well. This sketch was created at 300 dots per inch (dpi) resolution on a PC.

This is where the value of compression comes into play. By compressing much of the information to make it smaller, it can be transmitted more efficiently. LOSSLESS AND LOSSY COMPRESSION Compression techniques or algorithms can be divided into two basic categories: lossless and lossy. Lossless techniques compress an image in such a manner that the final decompressed image is an exact copy of the original image. Applications such as the In the Beginning 43 compression of medical X-rays or other diagnostic scans require the lossless technique to ensure that the original image is not distorted.

Monochrome images are concerned only with the first two signals that provide information about the brightness and coordination of each line that makes up the frame. These signals are called composite video because the synchronizing and luminance information are combined into a lone signal. The color signal is called a chroma-burst and must be accurately transmitted to the receiving end with no loss of information. The chrominance portion of the signal tells a video display what color to reveal.

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