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There are many ways to transmit the video signal from the camera to the monitoring site. Figure 2-21 shows some examples of transmission cables. The signal can be analog or digital. The signal can be transmitted via electrical conductors using coaxial cable or UTP, by fiber optic, by LAN or WAN, intranet or Internet. Particular attention should be paid to transmission means when transmitting color video signals since the color signal is significantly more complex and susceptible to distortion than monochrome.

The digitized scene signal is transmitted to the digital display be it LCD, plasma, or other, and reproduced on the monitor screen pixel-bypixel providing a faithful representation of the original scene. 2 Digital and Progressive Scan The digital scanning is accomplished in either the 2-to-1 interlace mode as in the analog system, or in a progressive mode. In the progressive mode each line is scanned in linear sequence: line 1, then line 2, line 3, etc. Solidstate camera sensors and monitor displays can be manufactured with a variety of horizontal and vertical pixels formats.

However, when there is precipitation (rain, snow, or sleet, or when fog intervenes) or in dusty, smoky, or sand-blown environments, this attenuation might be substantial and must be considered. Likewise in hot climates thermal effects (heat waves) and humidity can cause severe attenuation and/or distortion of the scene. Complete attenuation of the reflected light from the scene (zero visibility) can occur, in which case no scene image is formed. Since most solid-state cameras operate in the visible and near-infrared wavelength region the general rule of thumb with respect to visibility is that if the human eye cannot see the scene neither can the camera.

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