Snapshot spectropolarimetric imaging using a pair of filter array cameras

Abstract

Spectral and polarization imaging (SPI) is an emerging sensing method that permits the analysis of both spectral and polarization information of a scene. The existing acquisition systems are limited by several factors, such as the space requirement, the inability to capture quickly the information, and the high cost. We propose an SPI acquisition system with a high spatial resolution that combines six spectral channels and four polarization channels. The optical setup employs two color-polarization filter array cameras and a pair of bandpass filters. We define the processing pipeline, consisting of preprocessing, geometric calibration, spectral calibration, and data transformation. We show that, around specular highlights, the spectral reconstruction can be improved by filtering the polarized intensity. We provide a database of 28 spectropolarimetric scenes with different materials for future simulation and analysis by the research community.

Relationship between reflectance and degree of polarization in the VNIR-SWIR: A case study on art paintings with polarimetric reflectance imaging spectroscopy

“…SPI is a relatively new field of research with a lot of potential for applications in the context of Cultural Heritage analysis. Most of the literature on SPI has been focusing on the coupling of polarization imaging with multispectral systems, to compactly collect polarization and wide-band spectral data [28][29][30].…”

Production of high-resolution reference polarization images from real world scenes

“…Some polarization image databases or datasets depicting polarization scenes have been reported in the literature over the last few years. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] They contain the capture of various scenes under natural or artificial (be it controlled or not) illumination. They present very different characteristics: some of them are partly synthetic, some of them also contain depth information, ...…”

“…Some polarization image databases or datasets depicting real world scenes have been reported over the past few years. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Availability of high bandwidth communication networks and large data repositories allows researchers to easily share reference databases, especially with the development of open data. Their content is diverse, as well as the way they were captured.…”