Download PDF by Vlado Damjanovski: CCTV. Networking and Digital Technology
By Vlado Damjanovski
The re-creation of CCTV, a high-level expert reference, is extended to hide all video compression thoughts utilized in the ever-increasing collection of electronic video recorders (DVRs) in the marketplace this day. as well as demystifying DVR expertise, the 3rd version additionally clarifies the expertise of information networking and explains numerous compression options. in addition to all this, the booklet keeps the details that made the former variants handy and helpful, together with info of CCD cameras, lenses, coaxial cables, fiber-optics, and process layout.
- Updated to deal with electronic strategies, networking, and the net in closed-circuit tv
- Includes fresh sections on CCTV networking, electronic video recorders (DVRs), a variety of video compression suggestions, and knowing pixels and electronic picture caliber
- Fully illustrated with dozens of photos, tables, checklists, charts, diagrams, and directions
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Extra resources for CCTV. Networking and Digital Technology
The precision of the leaves’ movement is limited, and, more importantly, an unwanted optical effect called a Fresnel Edge Refraction becomes noticeable with small iris openings. This means that, in practice, very high F-stops cannot be achieved by using just mechanical methods. So, special optical neutral density (ND) ¿lters are used to “help” the leaves shutter achieve high F-stops as required by the sensitive CCD chips. The inferior optical precision of such ¿lters could make an image appear less sharp in very bright light and yet quite good in lower or normal light conditions.
Image Group of lenses Principal points and planes The secondary principal point may fall outside the group of lenses. This is the case with very short focal length lenses. The shorter the focal length is, the more optical elements have to be added for correcting various distortions, making the lens more expensive. With the CCD chip reduction (2/3'' down to 1/2'', then to 1/3'', and now to 1/4''), shorter focal length lenses have to be manufactured in Vlado Damjanovski 72 Optical axis Image plane Ocular C/CS-mount thread Second principal plane Iris plane First principal plane Objective 3.
Light and television Light onto an imaging sensor In order to fully understand the “light issue,” as seen by the camera, we need to know how much light actually falls on the imaging area. The illumination amount at the CCD (or CMOS) chip, ECCD, depends mostly on the luminance L of the object, but also on the F-stop of the lens, that is, the light-gathering ability of the lens. The lower the F-number (bigger iris opening) the more light will get through the lens, as will be explained later in the book.
CCTV. Networking and Digital Technology by Vlado Damjanovski