High Performance CMOS Range Imaging: Device Technology and Systems Considerations (Devices, Circuits, and Systems)
暫譯: 高效能CMOS範圍成像:裝置技術與系統考量(裝置、電路與系統)

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商品描述

This work is dedicated to CMOS based imaging with the emphasis on the noise modeling, characterization and optimization in order to contribute to the design of high performance imagers in general and range imagers in particular. CMOS is known to be superior to CCD due to its flexibility in terms of integration capabilities, but typically has to be enhanced to compete at parameters as for instance noise, dynamic range or spectral response. Temporal noise is an important topic, since it is one of the most crucial parameters that ultimately limits the performance and cannot be corrected. This work gathers the widespread theory on noise and extends the theory by a non-rigorous but potentially computing efficient algorithm to estimate noise in time sampled systems. 
This work contributed to two generations of LDPD based ToF range image sensors and proposed a new approach to implement the MSI PM ToF principle. This was verified to yield a significantly faster charge transfer, better linearity, dark current and matching performance. A non-linear and time-variant model is provided that takes into account undesired phenomena such as finite charge transfer speed and a parasitic sensitivity to light when the shutters should remain OFF, to allow for investigations of largesignal characteristics, sensitivity and precision. It was demonstrated that the model converges to a standard photodetector model and properly resembles the measurements. Finally the impact of these undesired phenomena on the range measurement performance is demonstrated.

商品描述(中文翻譯)

本研究專注於基於CMOS的影像技術,強調噪聲建模、特性化和優化,以促進高性能影像感測器的設計,特別是距離影像感測器。CMOS因其在整合能力方面的靈活性而被認為優於CCD,但通常需要進行增強,以在噪聲、動態範圍或光譜響應等參數上競爭。時間噪聲是一個重要的主題,因為它是最關鍵的參數之一,最終限制了性能且無法被修正。本研究彙集了廣泛的噪聲理論,並通過一種非嚴謹但潛在計算效率高的算法來擴展該理論,以估計時間取樣系統中的噪聲。

本研究對兩代基於LDPD的ToF距離影像感測器做出了貢獻,並提出了一種新的方法來實現MSI PM ToF原理。這一方法經驗證能顯著加快電荷轉移,提高線性度、暗電流和匹配性能。提供了一個非線性和時間變化的模型,考慮了不希望的現象,例如有限的電荷轉移速度和在快門應保持關閉時對光的寄生靈敏度,以便進行大信號特性、靈敏度和精度的研究。已證明該模型收斂於標準光電探測器模型,並能正確地反映測量結果。最後,展示了這些不希望的現象對距離測量性能的影響。