A single-pixel hyperspectral imager using two-stage Hadamard encoding

Abstract

This paper presents a hyperspectral imaging approach using a single-pixel detector. The system consists of a two-stage encoding system based on the concept of Hadamard transform. In contrast with conventional hyperspectral imaging methods where wavelength filters or Fourier spectroscopy is usually adopted, the spectral imaging system in this design uses an encoded slit, a resonant scanning mirror, and a fixed encoder mask to reconstruct the spectral image. The proposed method provides a novel way to set up an easily-controllable single-pixel approach that allows the imager to operate at any wavelength. We present a complete single-pixel hyperspectral imaging system with experimental results to demonstrate its working performance.