Methods to Calibrate a Digital Colour Camera as a Multispectral Imaging Sensor in Low Light Conditions

Author:

Simoneau Alexandre1ORCID,Aubé Martin123ORCID

Affiliation:

1. Département de Géomatique Appliquée, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada

2. Département de Physique, Cégep de Sherbrooke, Sherbrooke, QC J1E 4K1, Canada

3. Department of Physics and Astronomy, Bishop’s University, Sherbrooke, QC J1M 1Z7, Canada

Abstract

High-sensitivity multispectral imaging sensors for scientific use are expensive and consequently not available to scientific teams with limited financial resources. Such sensors are used in applications such as nighttime remote sensing, astronomy, and night time studies in general. In this paper, we present a method aiming to transform non-scientific multispectral imaging sensors into science-friendly ones. The method consists in developing a calibration procedure applied to digital colour cameras not initially designed for scientific purposes. One of our targets for this project was that the procedure would not require any complex or costly equipment. The development of this project was motivated by a need to analyze airborne and spaceborne pictures of the earth surface at night, as a way to determine the optical properties (e.g., light flux, spectrum type and angular emission function) of artificial light sources. This kind of information is an essential part of the input data for radiative transfer models used to simulate light pollution and its effect on the natural environment. Examples of applications of the calibration method are given for that specific field.

Funder

Canadian Space Agency

Fonds de Recherche du Québec

Publisher

MDPI AG

Subject

General Earth and Planetary Sciences

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