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AUTHOR(S): A. A. Shahin
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TITLE Compression & Decompression Techniques For Satellite E-O Images |
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ABSTRACT Image coding or compression is an important issue in case of E-O image transmission and storage. Elimination of spatial and/or temporal redundancy from sequential scene samples can be used to reduce the amount of required data to be transmitted or recorded to that needed to represent the “new” information in each sample set. The aim of image compression is to reduce the bandwidth or signal spectrum required by a radio relay data link and/or data recorder. It is also used so that more data can be carried over a channel with fixed bandwidth. Lowering the signal bandwidth permits reducing the power output required of the data link tra Keywords: SAR, DPCM technique, Land Cover, Texture Analysis nsmitter and still maintaining a good overall Signal-to-Noise ratio. Another reason for using data compression is so that detecting and correcting bits can be added to data stream to overcome the effects of transmission errors and different types of jamming. From among the three preferred types of data compression usually employed in space imagery, the choice is generally made based upon the amount of image degradation allowable, and cost. For an eight bit quantized image, the one dimensional DPCM can usefully applied down to 2-1/2 to 3 bits per sample or even beyond; while transform coding schemes have been shown to 1-1/2 to 2 bits per sample or somewhat beyond. For practical purposes then, a compression scheme, which reduces the need to record or transmit the scene data to a rate approaching 2 to 3 bits per sample, is recommended. For a single bit per sample can be assured in instances where this provides the only satisfactory answer and the budget is in a place to afford it. This paper represents a review of techniques used for coding of digital images; it shows the most proper technique to be used with E-O payloads. Predictive coding is presented, analyzed, simulated, and tested for the image of Minea area (Egypt) and the results are displayed [4]. |
KEYWORDS PCDM, DPCM technique, Predictive Coding, Coding Rate |
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Cite this paper A. A. Shahin. (2025) Compression & Decompression Techniques For Satellite E-O Images. International Journal of Instrumentation and Measurement, 10, 1-7 |
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