A developing approach of the space-based SIFP using rectangular algorithm
Signal Processing - Special section: Multimodal human-computer interfaces
Classification of water regions in SAR images using level sets and non-parametric density estimation
ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
Effective level set image segmentation with a kernel induced data term
IEEE Transactions on Image Processing
Lightweight probabilistic texture retrieval
IEEE Transactions on Image Processing
A marked point process for modeling lidar waveforms
IEEE Transactions on Image Processing
Multivariate elliptically contoured stable distributions: theory and estimation
Computational Statistics
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Synthetic aperture radar (SAR) imagery has found important applications due to its clear advantages over optical satellite imagery one of them being able to operate in various weather conditions. However, due to the physics of the radar imaging process, SAR images contain unwanted artifacts in the form of a granular look which is called speckle. The assumptions of the classical SAR image generation model lead to a Rayleigh distribution model for the histogram of the SAR image. However, some experimental data such as images of urban areas show impulsive characteristics that correspond to underlying heavy-tailed distributions, which are clearly non-Rayleigh. Some alternative distributions have been suggested such as the Weibull, log-normal, and the k-distribution which had success in varying degrees depending on the application. Recently, an alternative model namely the α-stable distribution has been suggested for modeling radar clutter. In this paper, we show that the amplitude distribution of the complex wave, the real and the imaginery components of which are assumed to be distributed by the α-stable distribution, is a generalization of the Rayleigh distribution. We demonstrate that the amplitude distribution is a mixture of Rayleighs as is the k-distribution in accordance with earlier work on modeling SAR images which showed that almost all successful SAR image models could be expressed as mixtures of Rayleighs. We also present parameter estimation techniques based on negative order moments for the new model. Finally, we test the performance of the model on urban images and compare with other models such as Rayleigh, Weibull, and the k-distribution.