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For a small company whose first-generation camera has yet to come to market (it’s available for preorder on theLytro site, and due in the first few months of this year), Lytro ismaking big waves. There’s a major reason for that: Lytro’s camerawill be the first consumer device that allows users to focus (andrefocus, and refocus…) an image after it’s shot, employing whatis called a light-field sensor. I used only a small portion of my interview with Chi in the CMOSstory, but given the massive amount of buzz surrounding Lytro inthe past few weeks the company won Last Gadget Standing honors at t
PCWorld: Would Lytro’s light-field capture be possible with a”slower” sensor technology, such as CCD? Charles Chi: To capture light field, your starting point is a traditionalsensor. A light-field sensor is tolerant to CMOS or CCD in fact,it doesn’t matter whatsoever. Because of the way we capture light,we’re looking to capture the actual rays of light. We can actuallytake sensors that have more defects in them than a traditionalcamera can, so that provides even more flexibility for the sensorvendor.
What we do is a custom package with the sensor, a package with whatwe call a micro-lens array. It fits right on top of the sensoritself, and that’s what creates the “light-field” sensor, inaddition to a lot of software and processing that comes afterwards. All the benefits that you would usually get from a CMOS sensor, webenefit from as well, in terms of fast read-out time. Moreimportant, I think there’s so much research being done on differenttypes of pixels for CMOS sensors, so that’s the type of technologyyou’d want to be on. The industry is doing so much developmentthere. fiber optic rose
What’s interesting is that, for a light-field camera, we don’tcapture the same kind of information as a traditional sensor. Whatwe’re trying to capture is rays of light, and the more of them wehave, the more interesting things we can do for imaging. There’s alot we can do for lens correction, aberration; we can do much moredramatic 3D effects, refocus effects. There’s a very long list as aresult of having more and more sensor resolution. Unliketraditional cameras, which have a [usable resolution] limit, thereis no diminishing return on resolution for a light-field camerauntil you get to a bill
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