A high dynamic range image sensor with linear response based on asynchronous event detection

Description

This paper investigates the potential of an image sensor that combines event-based asynchronous outputs with conventional integration of photocurrents. Pixels voltages can be read out following a traditional approach with a source follower and analog-to-digital converter. Furthermore, pixels have circuitry to implement Pulse Density Modulation (PDM) sending out pulses with a frequency that is proportional to the photocurrent. Both read-out approaches operate simultaneously. Their information is combined to render high dynamic range images. In this paper, we explain the new vision sensor concept and we develop a theoretical analysis of the expected performance in standard AMS 0.18mm HV technology. Moreover, we provide a description of the vision sensor architecture and its main blocks

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Ministerio de Economía, Industria y Competitividad TEC2012-38921-C02-02

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European Union IPT-2011-1625-430000

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Office of Naval Research (USA) N00014-14-1-0355

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