Coded aperture design in compressive spectral imaging based on side information

Laura Galvis, Daniel Lau, Xu Ma, Henry Arguello, Gonzalo R. Arce

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Coded aperture compressive spectral imagers (CSI) sense a three-dimensional data cube by using two-dimensional projections of the coded and spectrally dispersed input image. Recently, it has been shown that by combining spectral images acquired from a CSI sensor and a complementary sensor leads to substantial improvement in the quality of the fused image. To maximally exploit the benefits of the complementary information, the spatial structure of the coded apertures must be optimized inasmuch as these structures determine the sensing matrix properties and, accordingly, the quality of the reconstructed images. This paper proposes a method to use side information from a red-green-blue sensor to design the coded aperture patterns of a CSI imager, such that more detailed spatial images and wavelength profiles can be reconstructed. The side information is used as the input of an edge detection algorithm to approximate a version of the edges of the spectral images. The coded apertures are designed to follow the spatial structure determined by the estimated spectral edges, such that the high frequencies are promoted, leading to more detailed reconstructed spectral images. Simulations and experimental results indicate that when compared with random coded aperture structures, the designed coded apertures based on side information obtain up to 3 dB improvement in the quality of the reconstructed images.

Original languageEnglish
Pages (from-to)6332-6340
Number of pages9
JournalApplied Optics
Volume56
Issue number22
DOIs
StatePublished - Aug 1 2017

Bibliographical note

Funding Information:
Intel Corporation (1538950); National Science Foundation (NSF) (1538950); Vicerrectoria de Investigacion y Extension, Universidad Industrial de Santander (1890); Departamento Administrativo de Ciencia, Tecnología e Investigación (COLCIENCIAS). Laura Galvis is supported by a Colciencias scholarship.

Publisher Copyright:
© 2017 Optical Society of America.

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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