TAILIEUCHUNG - Scalable voip mobility intedration and deployment- P36

Scalable voip mobility intedration and deployment- P36: The term voice mobility can mean a number of different things to different people. Two words that can be quite trendy by themselves, but stuck together as if forgotten at a bus station long past the last ride of the night, the phrase rings a number of different, and at times discordant, bells. | The Future Video Mobility and Beyond 351 pixels in the device s display as there is not much sense in using a video stream that has a higher resolution than the display. Each pixel holds the color information for that pixel. This makes a pixel a rectangular area of uniform color. Computer representations of human-visible color can be measured in many different ways which is both a problem and an opportunity. For raw images which have no compression one common way to measure color is to use the RGB method. RGB relies on how the human eye can see three primary colors red green and blue and that all colors are some combination of those three. For this reason computer and television displays are made with pixels that are themselves made of the three different colors each lit with independent intensity. The perception of color is a rich and detailed subject but there are some concepts to it that we should briefly address here to give a sense for what is going on. Pure light as electromagnetic radiation can be thought of as having one frequency. The colors of the rainbow are all colors of one pure tone or light of one single frequency. The eye has cones the receptors that show color and these cones come in three types not surprisingly one for red one for blue and one for green. The three cones will respond differently for each pure spectral color giving the eye good coverage over all of the colors that can exist in the world. When light of one frequency falls upon the cones of the eye each type cone responds differently and predictably. From this comes the perception of the color of that frequency. Of course not all colors are made of pure color. White is most certainly not a pure color as it is able to be split by a prism into the entire rainbow spectrum. It must be more than just one frequency then. In fact it is a balanced mixture of many frequencies and comes out white because it is able to excite the three primary color cones the eye sees with even intensity. This .

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