Title :
A bio-inspired AER temporal tri-color differentiator
Author :
Farian, Lukasz ; Leñero-Bardallo, Juan Antonio ; Häfliger, Philipp
Author_Institution :
Dept. of Inf., Univ. of Oslo, Oslo, Norway
Abstract :
The paper presents the first focal plane array of asynchronous event pixels that react to temporal color contrast of three different color spectra. The three different spectra are transduced into photo currents by stacked photo diodes and temporal changes of the contrast of these three spectra are quantified as pulse density modulated signals and conveyed offchip by the Address Event Representation (AER) protocol. 16 × 16 pixel array has been implemented and tested in a 90 nm TSMC CMOS process. A single pixel measures 82 μm × 82 μm and has a fill factor of 27% and a dynamic range of 5 decades. The paper presents single pixel characteristics and shows visualization examples of the pixel array.
Keywords :
CMOS integrated circuits; bio-inspired materials; biomedical optical imaging; biomimetics; colour vision; data structures; data visualisation; focal planes; image colour analysis; medical image processing; photoconductivity; photodiodes; protocols; spectral analysis; AER protocol; TSMC CMOS process; address event representation protocol; asynchronous event pixel; bio-inspired AER temporal tri-color differentiator; color spectra transduction; dynamic range; fill factor; focal plane array; photocurrent; photodiode stacking; pixel array implementation; pixel array testing; pixel array visualization; pulse density modulated signal; single pixel characteristics; single pixel measure; size 82 mum; spectral contrast temporal change quantification; temporal color contrast; Arrays; Color; Dynamic range; Image color analysis; Photodiodes; Photoreceptors;
Conference_Titel :
Biomedical Circuits and Systems Conference (BioCAS), 2014 IEEE
Conference_Location :
Lausanne
DOI :
10.1109/BioCAS.2014.6981778
