Mr. Chaosheng Han Profile

Chaosheng Han

at Tsinghua Univ

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Proceedings Article | 3 November 2014 Paper

Explore spatial-temporal relations: transient super-resolution with PMD sensors

Chaosheng Han, Xing Lin, Jingyu Lin, Chenggang Yan, Qionghai Dai

Proceedings Volume 9273, 927338 (2014) https://doi.org/10.1117/12.2071722

KEYWORDS: Sensors, Modulation, Super resolution, Image resolution, 3D image processing, Light sources, Cameras, Reflectivity, Time of flight cameras, 3D modeling

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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.

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