Image acquisition and image processing for the intraocular vision aid.
The contribution describes an "intraocular vision aid (IOVA)" system for patients suffering from corneal opacification. In order to gain patients' acceptance the system has to be miniaturized to a magnitude that image acquisition, image processing, and power supply can be integrated into a portable unit. A CMOS camera whose dynamic range covers more than 100 dB takes pictures of the scenery. Its image sensor has a resolution of 380 x 300 pixel. In order to reduce fixed pattern noise correlated double sampling is implemented on-chip. In addition, this sensor stands out for low power consumption, random pixel access, and local brightness adaptation. An analog-digital-converter allows direct coupling to an external signal processor or a monolithically integrated unit for image processing to compress data.
Krisch
I
I
Fraunhofer Institute for Microelectronic Circuits and Systems, 47057 Duisburg, Germany. krisch@ims.fhg.de
Hijazi
N
N
Hosticka
B J
BJ
D003199:Computer Systems; D003318:Corneal Opacity / Q000534:rehabilitation*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation*; D008838:Microcomputers; D008904:Miniaturization / Q000295:instrumentation*; D019736:Prostheses and Implants; D012682:Sensory Aids