NDLI: Signal Separation Coding for Robust Depth Imaging Based on Structured Light

Content Provider	IEEE Xplore Digital Library
Author	Sukhan Lee Jongmoo Choi Daesik Kim Jaekeun Na Seungsub Oh
Copyright Year	2005
Description	Author affiliation: Intelligent Systems Research Center Sungkyunkwan University 300, Cheoncheon-dong, Jangan-gu, Suwon-si, Gyeonggi-do, 440-746, Korea; lsh@ece.skku.ac.kr (Sukhan Lee)
Abstract	This paper presents an original approach to coding the light patterns for robust depth imaging based on structured light. We have discovered that the degradation of precision and robustness, seen in most conventional approaches to structured light, comes mainly from the overlapping of multiple codes in the signal received at a camera pixel, where the overlapped codes are from the neighbouring and/or, even, distant pixels of the projecting mirror array. Considering the criticality of separating the overlapped codes to precision and robustness, we propose a novel signal separation code, referred to here as “Hierarchical Orthogonal Code (HOC),” for depth imaging. HOC provides not only the separation of overlapped codes, but also a robust decision on pixel correspondence with error correction based on a contextual likelihood among the sets of separated codes from neighbouring camera pixels. The experimental results have shown that the proposed HOC significantly enhances the robustness and precision in depth imaging, compared to the best known conventional approaches. The proposed approach opens a greater feasibility of applying structured light based depth imaging to a 3D modelling of cluttered workspace for home service robots.
Starting Page	4430
Ending Page	4436
File Size	362296
Page Count	7
File Format	PDF
ISBN	078038914X
DOI	10.1109/ROBOT.2005.1570802
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-04-18
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Source separation Robustness Image coding Pixel Mirrors Optical arrays Digital cameras Layout Intelligent systems Intelligent structures Orthogonal Coding Structured Light Depth Imaging Signal Separation
Content Type	Text
Resource Type	Article

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