2011 · 11 citations · 9 references
MedicineNeuroscienceVision ScienceColor VisionSensorsVisual PerceptionColor PerceptionDigital Image ProcessingImage ProcessingPhotodetectorsRetinal Ganglion CellsVisual SystemColor Image FilteringEvent-based VisionEvent-based Vision SensorsLight IntensityNeuromorphic DevicesNeuromorphic HardwarePulse ModulationVision Sensors
Asynchronous pixel PDM sensors are known as “octopus” retinae in the neuromorphic engineering community. The sensor uses a 22 × 22 pixel array of stacked photodiodes fabricated in a standard STM 90 nm CMOS process, with asynchronous pixel events transmitted via an AER bus and encoded by pulse‑density modulation of color‑filtered light. We implemented the first tri‑color AER vision sensor and demonstrated its spectral response and preliminary heuristic color image reconstruction.
We have implemented the very first tri-color address event representation (AER) vision sensor. It uses stacked photo diodes for color filtering in a standard STM 90nm CMOS process in a 22×22 pixel array. The AER bus protocol is used to convey asynchronous pixel events inspired by the ganglion cells of a mammalian retina. The pixels employ simple pulse density modulation (PDM) of color filtered light intensity. Asynchronous pixel PDM sensors are known as "octopus" retinae in the community of neuromorphic engineers. We have measured the relative spectra of the available standard PN-junctions and show first experimental results of heuristic color image reconstruction.
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A 5 Meps $100 USB2.0 Address-Event Monitor-Sequencer Interface
Raphael Berner, Tobi Delbrück, A Balcells et al. · 2007 · 93 citations · Full text