Mitigating the effect of optical back-scatter in multispectral underwater imaging

Halleh Mortazavi, John P. Oakley, Braham Barkat

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    Spectral information of an underwater scene, which can be found from a set of underwater multispectral images, is a very useful technique for extracting information from underwater world. But, underwater imaging is problematic even in multispectral image format. The main problem is the effect of optical back-scatter, which changes the scene reflectance value in each spectral band and this causes inaccuracy in the spectral information. In this work, a filter is used to detect the level of optical back-scatter in each spectral band from a set of multispectral images. Extraction of an underwater object spectra can be done by subtracting the estimated level of optical back-scatter and scaling the remainder in each spectral band from the captured image in the corresponding band. An experiment is designed to show the performance of the proposed filter for correcting the set of multispectral underwater images and recovering the pixel spectra. The multispectral images are captured in 33 bands in clear and different levels of turbid water. The results of processing experimental images in turbid water show that the effect of optical back-scatter can be mitigated in the image of each spectral band and as a result the spectra of the object can be recovered. However, for very high level of turbid water the recovery is limited because of the effect of extinction. © 2012 IEEE.
    Original languageEnglish
    Title of host publicationIST 2012 - 2012 IEEE International Conference on Imaging Systems and Techniques, Proceedings|IST - IEEE Int. Conf. Imaging Syst. Tech., Proc.
    PublisherIEEE
    Pages633-636
    Number of pages3
    ISBN (Print)9781457717741
    DOIs
    Publication statusPublished - 2012
    Event2012 IEEE International Conference on Imaging Systems and Techniques, IST 2012 - Manchester
    Duration: 1 Jul 2012 → …

    Conference

    Conference2012 IEEE International Conference on Imaging Systems and Techniques, IST 2012
    CityManchester
    Period1/07/12 → …

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