Spectral Reflectance Estimation Using Projector
with Unknown Spectral Power Distribution

Hironori Hidaka, Yusuke Monno, and Masatoshi Okutomi

Department of Systems and Control Engineering, School of Engineering,
Tokyo Institute of Technology

Color and Imaging Conference (CIC2020)

Abstract

A lighting-based multispectral imaging system using an RGB camera and a projector is one of the most practical and low-cost systems to acquire multispectral observations for estimating the scene's spectral reflectance information. However, existing projector-based systems assume that the spectral power distribution (SPD) of each projector primary is known, which requires additional equipment such as a spectrometer to measure the SPD. In this paper, we present a method for jointly estimating the spectral reflectance and the SPD of each projector primary. In addition to adopting a common spectral reflectance basis model, we model the projector's SPD by a low-dimensional model using basis functions obtained by a newly collected projector's SPD database. Then, the spectral reflectances and the projector's SPDs are alternatively estimated based on the basis models. We experimentally show the performance of our joint estimation using a different number of projected illuminations and investigate the potential of the spectral reflectance estimation using a projector with unknown SPD.

CIC 2020 Overview
Overview of our spectral reflectance estimation.

Publication

Spectral Reflectance Estimation Using Projector with Unknown Spectral Power Distribution

Authers: Hironori Hidaka, Yusuke Monno, and Masatoshi Okutomi
Color and Imaging Conference (CIC2020), pp.205-209, November, 2020

CIC 2020 Paper
CIC 2020 Slide

Database of projector's spectral power distributions

CIC 2020 Data