SAR image compression using wavelets

Chi-Man Kwan; Baoxin Li; Roger Xu; Trac D. Tran; Truong Q. Nguyen

doi:10.1117/12.421215

26 March 2001 SAR image compression using wavelets

Chi-Man Kwan, Baoxin Li, Roger Xu, Trac D. Tran, Truong Q. Nguyen

Proceedings Volume 4391, Wavelet Applications VIII; (2001) https://doi.org/10.1117/12.421215
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

Abstract

A new wavelet based image coder is proposed for SAR image compression. The coding technique known as OBTWC (Overlapped Block Transform Wavelet Coder) consists of three steps. First, a set of overlapped block transforms is used to transform the image data into 8 X 8 blocks in the frequency domain. Second, a mapping is then performed to convert the transformed image into a multiresolution representation that resembles the zero-tree wavelet transform. Third, the multiresolution representation is then coded by a conventional dyadic wavelet coder, which basically truncates the high frequency contents in a very efficient manner. Our proposed method essentially combines the advantages of both block transform and wavelet coding techniques while eliminating their respective weaknesses. The image compression algorithm was applied to SAR images supplied by Air Force, Army, and NASA. The compression performance in terms of Peak Signal-to-Noise Ratio is better than that of a commercial wavelet coder in the market.

Citation Download Citation

Chi-Man Kwan, Baoxin Li, Roger Xu, Trac D. Tran, and Truong Q. Nguyen "SAR image compression using wavelets", Proc. SPIE 4391, Wavelet Applications VIII, (26 March 2001); https://doi.org/10.1117/12.421215

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