Artículo
A spatial contrast retina with on-chip calibration for neuromorphic spike-based AER vision systems
Autor/es | Costas Santos, Jesús
Serrano Gotarredona, María Teresa Serrano Gotarredona, Rafael Linares Barranco, Bernabé |
Departamento | Universidad de Sevilla. Departamento de Arquitectura y Tecnología de Computadores |
Fecha de publicación | 2007 |
Fecha de depósito | 2018-07-23 |
Publicado en |
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Resumen | We present a 32 32 pixels contrast retina microchip that provides its output as an address event representation (AER) stream. Spatial contrast is computed as the ratio between pixel photocurrent and a local average between ... We present a 32 32 pixels contrast retina microchip that provides its output as an address event representation (AER) stream. Spatial contrast is computed as the ratio between pixel photocurrent and a local average between neighboring pixels obtained with a diffuser network. This current-based computation produces an important amount of mismatch between neighboring pixels, because the currents can be as low as a few pico-amperes. Consequently, a compact calibration circuitry has been included to trimm each pixel. Measurements show a reduction in mismatch standard deviation from 57% to 6.6% (indoor light). The paper describes the design of the pixel with its spatial contrast computation and calibration sections. About one third of pixel area is used for a 5-bit calibration circuit. Area of pixel is 58 m 56 m, while its current consumption is about 20 nA at 1-kHz event rate. Extensive experimental results are provided for a prototype fabricated in a standard 0.35- m CMOS process. |
Agencias financiadoras | Gobierno de España European Union (UE) |
Identificador del proyecto | TIC2003-08164-C03-01
TEC2006-11730-C03-01 IST-2001-34124 |
Cita | Costas Santos, J., Serrano Gotarredona, M.T., Serrano Gotarredona, R. y Linares Barranco, B. (2007). A spatial contrast retina with on-chip calibration for neuromorphic spike-based AER vision systems. IEEE Transactions on Circuits and Systems I: Regular Papers, 54 (7), 1444-1458. |
Ficheros | Tamaño | Formato | Ver | Descripción |
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A Spatial Contrast Retina.pdf | 3.655Mb | [PDF] | Ver/ | |