Filtering of radar images based on blind evaluation of noise characteristics

Vladimir V. Lukin; Nikolay N. Ponomarenko; Sergey K. Abramov; Benoit Vozel; Kacem Chehdi; Jaakko T. Astola

doi:10.1117/12.799396

10 October 2008 Filtering of radar images based on blind evaluation of noise characteristics

Vladimir V. Lukin, Nikolay N. Ponomarenko, Sergey K. Abramov, Benoit Vozel, Kacem Chehdi, Jaakko T. Astola

Proceedings Volume 7109, Image and Signal Processing for Remote Sensing XIV; 71090R (2008) https://doi.org/10.1117/12.799396
Event: SPIE Remote Sensing, 2008, Cardiff, Wales, United Kingdom

Abstract

A common assumption concerning noise in radar images is that it is of multiplicative nature and spatially uncorrelated. Meanwhile, recent studies have shown that additive noise component cannot be neglected, especially for images formed by side look aperture radars (SLARs). Moreover, majority of radar image filtering techniques are designed under assumption that noise is i.i.d., i.e. spatially uncorrelated. However, in many practical situations the latter assumption is not true. Besides, spatial correlation properties of noise can be different and they are often a priori unknown. In this paper we demonstrate that complex statistical and spatial correlation characteristics of noise in radar images can and should be taken into consideration at image filtering stage. We design a modification of the denoising algorithm based on discrete cosine transform (DCT) that is able to easily incorporate a priori information or obtained estimates of noise statistical and spatial correlation characteristics. This can be done in automatic (blind) manner due to utilizing a sequence of blind estimation operations. We present simulation results that show appropriate accuracy and robustness of these operations. Finally, real life image filtering examples are given that confirm the effectiveness of the designed techniques.

Citation Download Citation

Vladimir V. Lukin, Nikolay N. Ponomarenko, Sergey K. Abramov, Benoit Vozel, Kacem Chehdi, and Jaakko T. Astola "Filtering of radar images based on blind evaluation of noise characteristics", Proc. SPIE 7109, Image and Signal Processing for Remote Sensing XIV, 71090R (10 October 2008); https://doi.org/10.1117/12.799396

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available