Proceedings ArticleDOI
Focal-sweep for large aperture time-of-flight cameras
Sagar Honnungar,Jason Holloway,Adithya Pediredla,Ashok Veeraraghavan,Kaushik Mitra +4 more
- pp 953-957
TLDR
This work proposes a focal sweep-based image acquisition methodology to increase depth-of-field and eliminate defocus blur, and allows for a simple inversion algorithm to recover all-in-focus images.Abstract:
Time-of-flight (ToF) imaging is an active method that utilizes a temporally modulated light source and a correlation-based (or lock-in) imager that computes the round-trip travel time from source to scene and back. Much like conventional imaging ToF cameras suffer from the trade-off between depth of field (DOF) and light throughput-larger apertures allow for more light collection but results in lower DoF. This trade-off is especially crucial in ToF systems since they require active illumination and have limited power, which limits performance in long-range imaging or imaging in strong ambient illumination (such as outdoors). Motivated by recent work in extended depth of field imaging for photography, we propose a focal sweep-based image acquisition methodology to increase depth-of-field and eliminate defocus blur. Our approach allows for a simple inversion algorithm to recover all-in-focus images. We validate our technique through simulation and experimental results. We demonstrate a proof-of-concept focal sweep time-of-flight acquisition system and show results for a real scene.read more
Citations
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Journal ArticleDOI
Recent Advances in 3D Data Acquisition and Processing by Time-of-Flight Camera
Yu He,Shengyong Chen +1 more
TL;DR: This paper focuses only on recent progress of overcoming limitations such as systematic errors, object boundary ambiguity, multipath error, phase wrapping, and motion blur, and addresses the theoretical principles and future research trends as well.
Proceedings ArticleDOI
Focal sweep imaging with multi-focal diffractive optics
TL;DR: Experimental results indicate that the depth-of-field can be significantly extended with fewer artifacts remaining after the deconvolution, and two diffractive imaging systems are prototype that work in the monochromatic and RGB color domain.
Computational imaging with diffractive optics
TL;DR: In this article, the authors theoretically and experimentally investigate the applicability of numerical optimization into the design procedure of optics, to enable a variety of diffractive optics subject to different application scenarios.
Patent
Method and system for forming extended focal planes for large viewpoint changes
Seppo Valli,Pekka Siltanen +1 more
TL;DR: In this paper, a plurality of texture images of a scene are captured using a large-aperture camera, each texture image having a different focal distance, and a focal plane image is generated.
References
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Proceedings ArticleDOI
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