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Proceedings Paper

Image sensor with image smoothing capability using a neuron MOSFET
Author(s): Junichi Nakamura; Eric R. Fossum
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Paper Abstract

A novel image sensor with image smoothing capability is described. The image smoothing is performed in real time by a neuron MOSFET implemented on-chip. The neuron MOSFET has multiple input gates and a floating gate. The floating gate is capacitively coupled to the input gates, thereby performing gate-level weighted-sum operations. A pixel output node of the image sensor is connected to the input gates of several neuron MOSFETs which are implemented on the periphery of the imaging area. The pixel output is weighted by the input gate's capacitance value and summed up on the floating gate. Thus the filter characteristic is determined by the input gates' capacitance values and the number of pixels connected to the input gates of a neuron MOSFET. An active pixel sensor approach is suitable for the architecture because of its large driving capability. SPICE simulation results and experimental results of a linear array and a test structure are reported. The linear array outputs smoothed image and raw pixel signal. An edge detected signal can be obtained by subtracting the smoothed signal from the pixel signal. An area array configuration is also introduced.

Paper Details

Date Published: 1 May 1994
PDF: 8 pages
Proc. SPIE 2172, Charge-Coupled Devices and Solid State Optical Sensors IV, (1 May 1994); doi: 10.1117/12.172770
Show Author Affiliations
Junichi Nakamura, Olympus America Inc. (United States)
Eric R. Fossum, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 2172:
Charge-Coupled Devices and Solid State Optical Sensors IV
Morley M. Blouke, Editor(s)

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