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Proceedings Paper

Explore spatial-temporal relations: transient super-resolution with PMD sensors
Author(s): Chaosheng Han; Xing Lin; Jingyu Lin; Chenggang Yan; Qionghai Dai
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Paper Abstract

Transient imaging provides a direct view of how light travel in the scene, which leads to exciting applications such as looking around corners. Low-budget transient imagers, adapted from Time-of-Fight (ToF) cameras, reduce the barrier of entry for performing research of this new imaging modality. However, the image quality is far from satisfactory due to the limited resolution of PMD sensors. In this paper, we improve the resolution of transient images by modulating the illumination. We capture the scene under three linearly independent lighting conditions, and derive a theoretical model for the relationship between the time-profile and the corresponding 3D details of each pixel. Our key idea is that the light flight time in each pixel patch is proportional to the cross product of the illuminating direction and the surface normal. First we capture and reconstruct transient images by Fourier analysis at multiple illumination locations, and then fuse the data of acquired low-spatial resolution images to calculate the surface normal. Afterwards, we use an optimization procedure to split the pixels and finally enhance the image quality. We show that we can not only reveal the fine structure of the object but may also uncover the reflectance properties of different materials. We hope the idea of utilizing spatial-temporal relations will give new insights to the research and applications of transient imaging.

Paper Details

Date Published: 3 November 2014
PDF: 10 pages
Proc. SPIE 9273, Optoelectronic Imaging and Multimedia Technology III, 927338 (3 November 2014); doi: 10.1117/12.2071722
Show Author Affiliations
Chaosheng Han, Tsinghua Univ. (China)
Xing Lin, Tsinghua Univ. (China)
Jingyu Lin, Tsinghua Univ. (China)
Chenggang Yan, Tsinghua Univ. (China)
Qionghai Dai, Tsinghua Univ. (China)


Published in SPIE Proceedings Vol. 9273:
Optoelectronic Imaging and Multimedia Technology III
Qionghai Dai; Tsutomu Shimura, Editor(s)

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