A biomorphic digital image sensor

被引：279

作者：

Culurciello, E ^{[1
]}

Etienne-Cummings, R

Boahen, KA

机构：

[1] Johns Hopkins Univ, Dept Elect & Comp Engn, Baltimore, MD 21218 USA

[2] Univ Penn, Dept Bioengn, Philadelphia, PA 19104 USA

来源：

IEEE JOURNAL OF SOLID-STATE CIRCUITS | 2003年 / 38卷 / 02期

基金：

美国国家科学基金会;

关键词：

arbitrated; address event; digital image sensor; high dynamic range; low-power imager;

D O I：

10.1109/JSSC.2002.807412

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

An arbitrated address-event, imager has been designed and fabricated in a 0.6-mum CMOS process. The imager is composed of 80 x 60 pixels of 32 x 30 mum. The value of the light intensity collected by each photosensitive element is inversely proportional to the pixel's interspike time interval. The readout of each spike is initiated by the individual pixel; therefore, the available output bandwidth is allocated according to pixel output demand. This encoding of light intensities favors brighter pixels, equalizes the number of integrated photons across light intensity, and minimizes power consumption. Tests conducted on the imager showed a large output dynamic range of 180 dB (under bright local illumination) for an individual pixel. The array, on the other hand, produced a dynamic range of 120 dB (under uniform bright illumination and when no lower bound was placed on the update rate per pixel). The dynamic range is 48.9 dB value at 30-pixel updates/s. Power consumption is 3.4 mW in uniform indoor light and a mean event rate of 200 kHz, which updates each pixel 41.6 times per second. The imager is capable of updating each pixel 8.3K times per second (under bright local illumination). Index Terms-Arbitrated, address event, digital image sensor, high dynamic range, low-power imager.

引用

页码：281 / 294

页数：14

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