2011 Fiscal Year Final Research Report

A retinomorphic integrated vision sensor with adaptive sensitivity and spatial filtering

Research Project

Project/Area Number	22700175
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Single-year Grants
Research Field	Perception information processing/Intelligent robotics
Research Institution	Osaka University
Principal Investigator	OKUNO Hirotsugu 大阪大学, 大学院・工学研究科, 助教 (30531587)
Project Period (FY)	2010 – 2011
Keywords	イメージセンサ / 神経模倣 / 効率的符号化 / 順応 / 対数応答
Research Abstract	We designed and implemented an image sensor system equipped with three bio-inspired coding and adaptation strategies. The system includes a field-programmable gate array(FPGA), a resistive network, and photosensors, whose light intensity-voltage characteristics are controllable. The system employs multiple time-varying reset voltage signals for photosensors in order to realize multiple logarithmic intensity-voltage characteristics, which are controlled so that the entropy of the output image is maximized. The system also employs local average subtraction and gain control in order to obtain images with an appropriate contrast. The designed system was successfully used to obtain appropriate images of objects that were subjected to large changes in illumination.