2nd International Conference on Recent Advances in Space Technologies, İstanbul, Turkey, 9 - 11 June 2005, pp.445-450
This paper describes a method, that allows progressively image transfer over space communication channel, in which the quality of the image passed to the receiver can be adjusted. Images are converted into the appropriate format - bit plane sliced and turbo coded- on the transmitter side. With the desired image quality specified, the transmitter sends coded bit planes of image through the channel. The receiver cumulatively builds the coded data for the image while applying additional error correction -MAP (Maximum A posteriori Probability) algorithm- operations on the data obtained so far. The ability to specify desired image quality allows the receiver to satisfy constraints imposed by line bandwidth and response time. This method is illustrated with 4 bit gray scale images for simulation and can be extended for color images.