A hybrid event-based pixel for low-power image sensing

This article presents a hybrid pixel dedicated to event-based image sensors, which suppresses spatial and temporal redundancies. This pixel is a combination between two kinds of pixels, known as TFS and DVS. The first one is able to reduce - associated to a dedicated readout - spatial redundancies,...

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Bibliographic Details
Published in2021 28th IEEE International Conference on Electronics, Circuits, and Systems (ICECS) pp. 1 - 6
Main Authors Akrarai, Mohamed, Margotat, Nils, Sicard, Gilles, Fesquet, Laurent
Format Conference Proceeding
LanguageEnglish
Published IEEE 28.11.2021
Subjects
Dynamic Vision Sensor pixel
Event-based
Image sensors
Limiting
Power demand
Power measurement
Redundancy
Silicon-on-insulator
Time To First Spike pixel
trigger
Vision sensors
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Summary:This article presents a hybrid pixel dedicated to event-based image sensors, which suppresses spatial and temporal redundancies. This pixel is a combination between two kinds of pixels, known as TFS and DVS. The first one is able to reduce - associated to a dedicated readout - spatial redundancies, while the second manages the temporal redundancies. Each pixel is classically built with a photodiode but this hybrid structure shares the photodiode between the DVS and the TFS pixels. In our design, 4 TFS pixel photodiodes are shared with 1 DVS pixel, which exploits the average current of the latter. In order to evaluate such a pixel, a comparison is made between a hybrid pixel matrix and a matrix composed of TFS and DVS pixels. The evaluation is made in terms of activity and power but also by analyzing their fill-factor, circuitry and layout. A testchip including the 2 event-based image sensors has been designed in FDSOI 28 nm technology from STMicroelecronics.
DOI:10.1109/ICECS53924.2021.9665509