Distributed Focus and Digital Zoom

Abstract

We explore integrated microcamera focus systems for array cameras. We propose a new model for system camera integration relying on fast action focus mechanisms with < 10mm aperture. Rather than reducing resolution or expanding aperture size, such systems can be used in arrays to enable digital zoom. We show that a common mechanism supports camera modules with focal lengths ranging from 25 to 60 mm. Designs for each focal length include a fixed objective lens group and an adjustable back focus group. Increasing the focal power of the front focal group enables the travel range of available microcamera modules to accommodate long focal length systems. We present design examples both discrete and multiscale array camera systems.

Smart Cameras

“…Conventional removable lens systems are much too large to support 10-100x increases in processed pixel count that smart cameras demand, but multiscale or discrete arrays of 1-2 micron pixel pitch microcameras with focal lengths varying from 3 to 50 mm can resolve 100 megapixel to several gigapixel fields with modest size, weight, power and cost [50]. Of equal significance, such arrays can use the fast and reliable focus mechanisms developed for mobile camera systems [104,105]. With the shift in lens design toward smaller pixels and faster f#, lens systems for smart cameras may be expected to appear like insect eyes, with clusters of lenslets of various sizes sampling various focal states, colors and frame rates.…”