Thursday 25 August 2005

G6

PTH0065
Modified Goldstein filter for filtering noisy SAR interferograms
Li, Zhiwei¹, Ding, Xiaoli¹, Huang, Cheng², Zheng, Dawei^1,2
1 Hong Kong Polytechnic University, Hong Kong
2 Shanghai Astronomical Observatory, China
Author email: lsxlding@polyu.edu.hk
A modification to the Goldstein filter is proposed for filtering interferograms with strong noise. The least square-based one-dimensional Vondr¨¢k filter is extended into two dimensions, and utilized to smooth the spectrum of each segmented interferogram patch. The smoothed spectrum is then back-transformed into the interferogram space. Experimental results obtained with simulated and real datasets show that the performance of the proposed filter is 33% to 64% better than some existing methods. The stronger the noise is in an interferogram, the greater the improvement is.

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