@inproceedings{b78c54a8d0b24c80b194119fbf114ef6,
title = "Intensity normalization of sidescan sonar imagery",
abstract = "Sonar imaging is currently the exemplary choice used in underwater imaging. However, since sound signals are absorbed by water, an image acquired by a sonar will have gradient illumination; thus, underwater maps will be difficult to process. In this work, we investigated this phenomenon with the objective to propose methods to normalize the images with regard to illumination. We propose to use MIxed exponential Regression Analysis (MIRA) estimated from each image that requires normalization. Two sidescan sonars have been used to capture the seabed in Lake Vattern in Sweden in two opposite directions west-east and east-west; hence, the task is extremely difficult due to differences in the acoustic shadows. Using the structural similarity index, we performed similarity analyses between corresponding regions extracted from the sonar images. Results showed that MIRA has superior normalization performance. This work has been carried out as part of the SWARMs project (http://www.swarms.eu/).",
keywords = "acoustic shadow, dark channel prior, echo decay, exponential regression, illumination normalization, inverse square law, Sidscan sonar",
author = "Al-Rawi, {M. S.} and Adri{\'a}n Galdr{\'a}n and Xin Yuan and Martina Eckert and Mart{\'i}nez, {Jos{\'e} Fern{\'a}n} and Fredrik Elmgren and Baran C{\"u}r{\"u}kl{\"u} and Jonathan Rodriguez and Joaquim Bastos and Marc Pinto",
note = "Publisher Copyright: {\textcopyright} 2016 IEEE.; 6th International Conference on Image Processing Theory, Tools and Applications, IPTA 2016 ; Conference date: 12-12-2016 Through 15-12-2016",
year = "2017",
month = jan,
day = "17",
doi = "10.1109/IPTA.2016.7820967",
language = "English",
series = "2016 6th International Conference on Image Processing Theory, Tools and Applications, IPTA 2016",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
editor = "Matti Pietikainen and Abdenour Hadid and Lopez, {Miguel Bordallo}",
booktitle = "2016 6th International Conference on Image Processing Theory, Tools and Applications, IPTA 2016",
address = "United States",
}