Carpena-Colón, Emmanuel

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    Hyperspectral Coastal Image Analysis Toolbox (HyCIAT) enhancement: Subsurface linear unmixing and object detection by means of regularization
    (2017) Carpena-Colón, Emmanuel; Jiménez, Luis O.; College of Engineering; Arzuaga, Emmanuel; Hunt, Shawn; Department of Electrical and Computer Engineering; Castellano Rodriguez, Dorial
    This work presents an enhancement to the Hyperspectral Coastal Image Analysis Toolbox (HyCIAT). HyCIAT is a graphic interface developed in MATLAB, for the estimation of water optical properties, bathymetry and bottom composition using a hyperspectral image of a shallow underwater environment [1]. The implemented algorithms for the estimation of the submerged bottom are based on the inversion model developed by Z. P. Lee combined with unmixing techniques developed by J. A. Goodman and A. Castrodad [2]–[5]. The graphic interface ceased to work on MATLAB versions over 2008b due to some compatibility issues. With this work, HyCIAT was enabled to be used onMATLAB 2013a. New functionalities are implemented to allow additional configurations of the unmixing algorithms. HyCIAT was further enhanced with the integration of a new subsurface classification algorithm by means of regularization techniques developed by L. O. Jiménez-Rodríguez and E. Rodríguez-Díaz [6], [7]. Algorithms were tested using a hyperspectral data set obtained from an indoor controlled environment that simulates an object submerged on fresh and turbid water. A new method was presented for the empirically retrieval of the optical properties of water using Z. P. Lee inversion model and the obtained hyperspectral data set. Results shows that the new functionalities have a positive impact on unmixing results by increasing the overall accuracy on objects submerged in fresh and turbid waters. At the other hand, the classification accuracy of objects submerged in fresh and turbid water was also increased with the use of the regularization algorithms. Finally, additional tools were included in the toolbox that extends HyCIAT capabilities for a more complete and robust interface.