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Depth estimation using spectrally varying defocus blur

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2021

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Ishihara, Shin
Sato, Imari

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Journal of the Optical Society of America A. Optical Society of America (OSA). 2021, 38(8), pp. 1140-1149. ISSN 1084-7529. eISSN 1520-8532. Available under: doi: 10.1364/JOSAA.422059

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This paper proposes a method to estimate depth from a single multispectral image by using a lens property known as chromatic aberration. Chromatic aberration causes light passing through a lens to be refracted depending on the wavelength. The refraction causes the angle of rays to vary depending on their wavelength and a change in focal length, which leads to a defocus blur for different wavelengths. We propose a theory to recover a continuous depth map from the blur in a single multispectral image that includes chromatic aberration. The proposed method needs only a standard wide-aperture lens, which naturally exhibits chromatic aberration, and a multispectral camera. Moreover, we use a simple yet effective depth-of-field synthesis method to calculate the derivatives and obtain all-in-focus images necessary to approximate spectral derivatives. We verified the effectiveness of the proposed method on various real-world scenes.

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ISO 690ISHIHARA, Shin, Antonin SULC, Imari SATO, 2021. Depth estimation using spectrally varying defocus blur. In: Journal of the Optical Society of America A. Optical Society of America (OSA). 2021, 38(8), pp. 1140-1149. ISSN 1084-7529. eISSN 1520-8532. Available under: doi: 10.1364/JOSAA.422059
BibTex
@article{Ishihara2021Depth-54754,
  year={2021},
  doi={10.1364/JOSAA.422059},
  title={Depth estimation using spectrally varying defocus blur},
  number={8},
  volume={38},
  issn={1084-7529},
  journal={Journal of the Optical Society of America A},
  pages={1140--1149},
  author={Ishihara, Shin and Sulc, Antonin and Sato, Imari}
}
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