Optical polarization to improve discrimination capability of remote sensing: a laboratory study
Abstract:Recent procedure for the generation of polarized images (Ramesh Chandra and Narottam Singh 1997) has been adopted to generate images which show, from simultaneously acquired field radiometric data: (i) average values of degree of linear polarization (DOP) of light reflected from the surfaces of plane objects; (ii) the maximum intensity (Imax) of light transmitted through a visible linear polarizer in one spectral band 0.504-0.596m; and (iii) the minimum intensities (Imin) of light transmitted through visible linear polarizers in three spectral bands in the wavelength region 0.504-0.79m. Sixteen false colour composites (FCCs) from different combinations of DOP, Imax and Imin data files have been created on one photograph from simultaneously acquired field radiometric data for comparison. Comparison of images reveals that indiscriminable objects which have similar diffused radiance can be discriminated by including polarization data if they have variation in the DOP. Also, objects invisible in FCCs made from Imin data files without stretching can be seen in FCCs made from DOP, Imax and Imin data files without stretching.
Document Type: Research Article
Publication date: January 10, 2001