Grid-pattern design for fast scene reconstruction by a 3D vision sensor

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

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  • Qiu Guan
  • Shengyong Chen
  • Wanliang Wang
  • Y. F. Li


Original languageEnglish
Article number80
Pages (from-to)201-209
Journal / PublicationProceedings of SPIE - The International Society for Optical Engineering
Volume5856 PART I
Publication statusPublished - 2005


TitleOptical Measurement Systems for Industrial Inspection IV
Period13 - 17 June 2005


This paper presents a method of pattern design for a 3D vision sensor, which is based on the principles of color-encoded structured light, to improve the reconstruction efficiency. Since an ordinary structured light system using an LCD projector needs to take several images (usually 8-12 images) for recovering the 3D scene, as a result its speed is limited and applications are restricted in acquisition of static environment. For dynamic cases, the 3D measurement is desired to only capture a single image. To realize this, a new method is to use a color projector which can be controlled by a computer to generate arbitrary desired color patterns. A problem of the color encoded projection is the unique indexing of the light codes in the image. It is essential that each light grid be uniquely identified by incorporating the local neighborhoods in the light pattern so that 3D reconstruction can be performed with only local analysis of the single image. This paper proposes a method in design of such grid patterns. Experiments are provided to demonstrate the proposed method with two, three, and four different colors. The maximum possible square matrices are illustrated.

Research Area(s)

  • 3D vision sensor, Fast sensing, Grid pattern, Light projection, Scene reconstruction