Krill-eye : Superposition Compound Eye for Wide-Angle Imaging via GRIN Lenses

OMNIVIS2009
IPSJ Trans. CVA

Abstract We propose a novel wide angle imaging system inspired by compound eyes of animals. Instead of using a single lens, well compensated for aberration, we used a number of simple lenses to form a compound eye which produces practically distortion-free, uniform images with angular variation. The images formed by the multiple lenses are superposed on a single surface for increased light efficiency. We use GRIN~(gradient refractive index) lenses to create sharply focused images without the artifacts seen when using reflection based methods for X-ray astronomy. We show the theoretical constraints for forming a blur-free image on the image sensor, and derive a continuum between $1:1$ flat optics for document scanners and curved sensors focused at infinity. Finally, we show a practical application of the proposed optics in a beacon to measure the relative rotation angle between the light source and the camera with ID information. Paper High resolution paper (~2.7MB) Representative movie (mpeg-1 with audio, 3min) Supplemental materials Image quality evaluation by simulation Rotation angle estimation using Krill-eye Beacon