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A dynamic vision sensor with 1 temporal contrast sensitivity and in-pixel asynchronous delta modulator for event encoding

机译:具有1%时域对比灵敏度的动态视觉传感器和用于事件编码的像素内异步增量调制器

摘要

A dynamic vision sensor (DVS) encodes temporal contrast (TC) of light intensity into address-events that are asynchronously transmitted for subsequent processing. This paper describes a DVS with improved TC sensitivity and event encoding. To enhance the TC sensitivity, each pixel employs a common-gate photoreceptor for low output noise and a capacitively-coupled programmable gain amplifier for continuous-time signal amplification without sacrificing the intra-scene dynamic range. A proposed in-pixel asynchronous delta modulator (ADM) better preserves signal integrity in event encoding compared with self-timed reset (STR) used in previous DVSs. A 60 × 30 prototype sensor array with a 31.2 μm pixel pitch was fabricated in a 1P6M 0.18 μm CMOS technology. It consumes 720 μW at a 100k event/s output rate. Measurements show that a 1% TC sensitivity with a 35% relative standard deviation is achieved and that the in-pixel ADM is up to 3.5 times less susceptible to signal loss than STR in terms of event number. These improvements can facilitate the application of DVSs in areas like optical neuroimaging which is demonstrated in a simulated experiment.
机译:动态视觉传感器(DVS)将光强度的时间对比度(TC)编码为地址事件,这些事件被异步传输以进行后续处理。本文介绍了一种具有改进的TC灵敏度和事件编码的DVS。为了提高TC灵敏度,每个像素都采用了一个共栅极感光器来降低输出噪声,并采用一个电容耦合的可编程增益放大器来进行连续时间的信号放大,而不会牺牲场景内的动态范围。与以前的DVS中使用的自定时复位(STR)相比,建议的像素内异步增量调制器(ADM)在事件编码中更好地保​​留了信号完整性。采用1P6M 0.18μmCMOS技术制造了像素间距为31.2μm的60×30原型传感器阵列。在100k事件/秒的输出速率下,它消耗720μW。测量表明,在事件数量方面,实现了1%的TC灵敏度和35%的相对标准偏差,并且像素内ADM的信号丢失敏感性比STR弱3.5倍。这些改进可以促进DVS在光学神经成像等领域的应用,这在模拟实验中得到了证明。

著录项

  • 作者

    Yang M-H; Liu S-C; Delbruck T;

  • 作者单位
  • 年度 2015
  • 总页数
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类

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