The other simplier process is like this,
send a weather chart or a moon photo, you would start in the upper left corner. You would send the value of that pixel (dot), black, white, or perhaps a shade of gray. Then you would move over one pixel to the right, and send that pixel, and so on, until you reach the edge of the chart. Then you'd move all the way back to the left edge, and move down slightly, one line, and repeat the process. This is nothing but a simple modulation over the wave,such waves are very weak but huge parabolic antenna at earth station picks up these waves,nice question indeed.
Here is another process to show them in color, Color Coded Signals When a satellite takes an image from space, the value of each pixel is changed into a radio signal and sent to Earth. Here on Earth the radio signal is changed back into an image. A satellite image is comprised of thousands of pixels.
Satellites typically transmit pixels with assigned values of 0 to 255, with 0 representing pure black and 255 pure white. Intermediate values are represented by varying shades of gray which may be translated to colors ("false colored") by a computer to make the image easier to understand. Create a satellite image of colored pixels to detect subtle detail in your "transmitted" imagery.
1. To introduce the idea of how pixels combine to produce a recognizable image, look at the image on a computer monitor with a magnifying lens.
2. Newspaper photographs and television images are also made up of pixels. To illustrate use a photocopier to enlarge a newspaper photograph to several times its normal size.
2. Assign a block of values, such as
Pixel ValueNumberColor0-450Black46-901Dark Blue91-1352Light Blue136-1803Orange181-2254Yellow226-2555White
Last edited by ECM : 15th November 2008 at 00:44.
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