The two commonly used types of monitors for video

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Unformatted text preview: ng concepts that involve movement. Although both animation and video deal with the display of a sequence of images (frames) to generate an effect of motion, but video typically deals with recording of a real-life event produced by a device such as a digital video recorder. Like animation data, video data also requires large storage space and needs to meet the real-time constraints on retrieval, delivery, and display. Again, digital video compression or a compromise in quality can be applied to reduce the storage requirement. Video information travels in natural media in the form of light waves, which are analog in nature. In order for the computer to be able to understand video information, light waves must be converted from analog form to digital form. Video camera is a transducer that is commonly used to convert light waves into electrical signals. Conversely, monitor is a transducer that is commonly used to convert electrical signals into light waves. Like audio, in case of video also the transformation between analog and digital signals is achieved by A/D and D/A conversions as shown in Figure 19.3. Analog-to-digital conversion of video also involves the sampling and quantization of analog signals as already explained before and shown in Figure 19.4. A multimedia computer system capable of processing video information requires a video board (or video card), which is equipped with A/D and D/A converters. Video Display Technologies As already mentioned before in this chapter (see Figure 19.2), an image is represented as a collection of pixels, which are arranged as a two-dimensional matrix. Each pixel is of the size of a small dot. Hence, an image can be thought of as made up of horizontal lines, each a row of individual dots (pixels). To paint an entire video image on a monitor screen, an electron gun illuminates every pixel as it sweeps across the screen, one line at a time, from left to right and from top to bottom and then back on the top. This process, called raster scanning, has to be repeated several tim...
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This document was uploaded on 04/07/2014.

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