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Proceedings Paper

A 3D image sensor with adaptable charge subtraction scheme for background light suppression
Author(s): Jungsoon Shin; Byongmin Kang; Keechang Lee; James D. K. Kim
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Paper Abstract

We present a 3D ToF (Time-of-Flight) image sensor with adaptive charge subtraction scheme for background light suppression. The proposed sensor can alternately capture high resolution color image and high quality depth map in each frame. In depth-mode, the sensor requires enough integration time for accurate depth acquisition, but saturation will occur in high background light illumination. We propose to divide the integration time into N sub-integration times adaptively. In each sub-integration time, our sensor captures an image without saturation and subtracts the charge to prevent the pixel from the saturation. In addition, the subtraction results are cumulated N times obtaining a final result image without background illumination at full integration time. Experimental results with our own ToF sensor show high background suppression performance. We also propose in-pixel storage and column-level subtraction circuit for chiplevel implementation of the proposed method. We believe the proposed scheme will enable 3D sensors to be used in out-door environment.

Paper Details

Date Published: 19 February 2013
PDF: 7 pages
Proc. SPIE 8659, Sensors, Cameras, and Systems for Industrial and Scientific Applications XIV, 865907 (19 February 2013); doi: 10.1117/12.2005761
Show Author Affiliations
Jungsoon Shin, Samsung Advanced Institute of Technology (Korea, Republic of)
Byongmin Kang, Samsung Advanced Institute of Technology (Korea, Republic of)
Keechang Lee, Samsung Advanced Institute of Technology (Korea, Republic of)
James D. K. Kim, Samsung Advanced Institute of Technology (Korea, Republic of)


Published in SPIE Proceedings Vol. 8659:
Sensors, Cameras, and Systems for Industrial and Scientific Applications XIV
Ralf Widenhorn; Antoine Dupret, Editor(s)

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