Improvement of Range Resolution in a Time-of-Flight Range Image Sensor

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Other Title
  • Time-of-Flight距離画像センサの距離分解能の改善(立体映像技術一般)
  • Time-of-Flight距離画像センサの距離分解能の改善
  • Time of Flight キョリ ガゾウ センサ ノ キョリ ブンカイノウ ノ カイゼン

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Description

In Time-of-Flight (TOF) range image sensors using periodical pulsed light, there is a trade-off between the maximum range and range resolution. This paper proposes a range-shift technique for improving range resolution of the TOF range image sensor without sacrificing the measurement range. The range-shift operation uses a TOF range imaging pixel with periodical charge draining structure and several time-shifted short pulses. The use of the short pulse can improve the range resolution. The range image using the range-shift technique is synthesized with several sub-frames, each acquires one of the shifted range images. The use of the small duty-ratio pulse leads to reducing the effect of ambient light and improving the range resolution. The range-shift technique is tested with an implemented TOF range image sensor and it is found that the range resolution is improved to 2cm using a 10ns light pulse and 7 overlapped shifted ranges for the measurement range of 0.5m to 4.0m.

Journal

  • ITE Technical Report

    ITE Technical Report 32.44 (0), 21-24, 2008

    The Institute of Image Information and Television Engineers

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