Title :
Autofocussing SAR and SAS images using a conjugate gradient search algorithm
Author :
Gough, P.T. ; Lane, R.G.
Author_Institution :
Dept. of Electr. & Electron. Eng., Canterbury Univ., Christchurch, New Zealand
Abstract :
We demonstrate a simple conjugate gradient optimizing algorithm that can restore motion-blurred spotlight SAR or SAS images. The key to an effective restoration is an appropriate cost function based on image sharpness criterion combined with the probability of the estimated path trajectory. The image can be optimized efficiently using the derivative of the cost function. Examples of blurred and restored simulated images are shown
Keywords :
conjugate gradient methods; image enhancement; image restoration; optimisation; radar imaging; search problems; sonar imaging; synthetic aperture radar; SAR images; SAS images; autofocussing; blurred simulated images; conjugate gradient search algorithm; cost function; estimated path trajectory; image sharpness; motion-blurred spotlight images; optimizing algorithm; restored simulated images; synthetic aperture sonar; Bayesian methods; Convolution; Cost function; Fourier transforms; Image restoration; Radar polarimetry; Synthetic aperture sonar; Tracking;
Conference_Titel :
Geoscience and Remote Sensing Symposium Proceedings, 1998. IGARSS '98. 1998 IEEE International
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-4403-0
DOI :
10.1109/IGARSS.1998.699530
