IEEE Trans Biomed Circuits Syst. 2015 Oct;9(5):686-98. doi: 10.1109/TBCAS.2015.2492460. Epub 2015 Oct 30.
This article investigates the potential of a bio-inspired vision sensor with pixels that detect transients between three primary colors. The in-pixel color processing is inspired by the retinal color opponency that are found in mammalian retinas. Color transitions in a pixel are represented by voltage spikes, which are akin to a neuron's action potential. These spikes are conveyed off-chip by the Address Event Representation (AER) protocol. To achieve sensitivity to three different color spectra within the visual spectrum, each pixel has three stacked photodiodes at different depths in the silicon substrate. The sensor has been fabricated in the standard TSMC 90 nm CMOS technology. A post-processing method to decode events into color transitions has been proposed and implemented as a custom interface to display real-time color changes in the visual scene. Experimental results are provided. Color transitions can be detected at high speed (up to 2.7 kHz). The sensor has a dynamic range of 58 dB and a power consumption of 22.5 mW. This type of sensor can be of use in industrial, robotics, automotive and other applications where essential information is contained in transient emissions shifts within the visual spectrum.
本文研究了一种具有检测三原色之间瞬变功能的仿生视觉传感器的潜力。像素内的颜色处理受到哺乳动物视网膜中发现的视网膜颜色对立的启发。像素中的颜色转换由电压尖峰表示，类似于神经元的动作电位。这些尖峰通过地址事件表示 (AER) 协议在片外传输。为了在视觉光谱内实现对三种不同颜色光谱的灵敏度，每个像素在硅衬底的不同深度都有三个堆叠的光电二极管。该传感器已采用标准 TSMC 90nm CMOS 技术制造。已经提出了一种将事件解码为颜色转换的后处理方法，并作为一个自定义接口实现，以显示视觉场景中的实时颜色变化。提供了实验结果。颜色转换可以高速检测（高达 2.7kHz）。传感器的动态范围为 58dB，功耗为 22.5mW。这种类型的传感器在工业、机器人、汽车和其他应用中非常有用，其中视觉光谱内的瞬态发射偏移包含重要信息。
