Telecommunications Sensors

Download CCTV, Second Edition: Networking and Digital Technology by Vlado Damjanovski PDF

Posted On April 11, 2017 at 12:27 pm by / Comments Off on Download CCTV, Second Edition: Networking and Digital Technology by Vlado Damjanovski PDF

By Vlado Damjanovski

Closed circuit tv (CCTV) is experiencing a jump in know-how utilizing electronic thoughts and the web. the recent version of this high-level expert reference keeps the details that made the 1st variation a hit, together with the main points of CCD cameras, lenses, coaxial cables, fiber-optics, and method layout, however it is improved to hide all video compression suggestions utilized in the ever expanding collection of electronic video recorders (DVRs) in the marketplace this present day. It additionally serves to explain the know-how of information networking. The theoretical part explains a number of the compression thoughts, equivalent to MPEG-1, MPEG-2, JPEG, Wavelet, H.261/263, JPEG-2000, MPEG-4, and so on. Networking is additionally a brand new and unknown sector for plenty of CCTV installers and this is often defined in a new section.The problem of choosing the fitting process from one of these big choice of recent applied sciences to be had in CCTV has been compounded by way of the appearance of DVRs. This new version of the publication CCTV demystifies DVR know-how. -Covers fresh electronic video recorder (DVR) compression concepts, picture caliber, measuring and networking-Fully illustrated with dozens of photos, tables, checklists, charts, diagrams and instructions-Encompasses CCTV criteria for united states, Europe, and Australia

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Additional resources for CCTV, Second Edition: Networking and Digital Technology

Sample text

One phot is equal to 10,000 lx. In American terminology, where square feet are still widely used instead of the SI units, illumination is expressed in square-foot candelas, or better known as foot-candelas. 29), it is reasonably easy to convert luxes into foot-candelas and vice versa. Basically, if an illumination is given in foot-candelas, just divide it by 10 and the approximate value in luxes is obtained, and if a value is given in luxes, in order to convert it to foot-candelas, multiply it by 10.

This is just a very simple example of why numerous optical elements are required to compose a lens of a certain focal length. Lenses produce many other distortions, not just the chromatic aberration, but among others, also geometrical (“pincushion” and “barrel”) and spherical. The name suggests the type of distortion it adds to the image. These can also be corrected by adding some more optical elements to the group.

The internationally preferred metric unit is nit. One nit is equal to one candela per square meter of projected surface area (I/A). If, instead of candelas, lumens are used to describe the luminous flux of a source, the luminance will then be expressed in apostilbs [asb]. Things get a bit more complicated when we have a surface where the luminous flux radiated, or reflected, in a direction θ to the normal is directly proportional to cos θ. Such a surface will appear equally bright when seen from all directions because both the reflected light and projected surface area follow the same cosine law.

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