Shape from Thermal Radiation:
Passive Ranging Using Multi-spectral LWIR Measurements

CVPR 2022

Yasuto Nagase1 Takahiro Kushida1 Kenichiro Tanaka2 Takuya Funatomi1 Yasuhiro Mukaigawa1

Nara Institute of Science and Technology (NAIST), Japan1 Ritsumeikan University, Japan2

image

Some result of our depth sensing method: Shape from Thermal Radiation.

Abstract

In this paper, we propose a new cue of depth sensing using thermal radiation. Our method realizes passive, texture independent, far range, and dark scene applicability, which can broaden the depth sensing subjects. A key observation is that thermal radiation is attenuated by the air and is wavelength dependent. By modeling the wavelength-dependent attenuation by the air and building a multi-spectral LWIR measurement system, we can jointly estimate the depth, temperature, and emissivity of the target. We analytically show the capability of the thermal radiation cue and show the effectiveness of the method in real-world scenes using an imaging system with a few bandpass filters.

Overview

image

Overview of the shape from thermal radiation. Our method jointly estimates the depth, temperature, and emissivity images from multi-spectral LWIR images. A key observation is that thermal radiation from the target object is attenuated through the air and is wavelength dependent.

BibTeX