Berkeley CSUA MOTD:Entry 40770
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2025/05/24 [General] UID:1000 Activity:popular
5/24    

2005/11/29-12/2 [Consumer/Camera] UID:40770 Activity:nil
11/29   Cool camera from the farm:
        http://www.dpreview.com/news/0511/05112206refocuscamera.asp
        \_ tres cool. http://graphics.stanford.edu/papers/lfcamera
           is the engineer's website.  It has some cool WMV demos.
           It also has a tech report.  If anyone reads it, can you post a
           summary?
           It also has a tech report.  So far, I get the idea that they're
           taking a 4000x4000 resolution digital back and refocusing reduces
           it to 296x296 resolution.  Some somehow, each 13x13 capture of
           each microlens captures ~200 points of 4D light field.
        \_ I'd love to have that Contax 645 just by itself, even without his
           invention.
        \_ why WMV?  typical Stanford, I guess.
2025/05/24 [General] UID:1000 Activity:popular
5/24    

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www.dpreview.com/news/0511/05112206refocuscamera.asp
Ren Ng, graduate student at Stanford University has devel oped a hand-held plenoptic camera which takes a shot first and allows yo u to make the decision about focus point in software after the event. Th e prototype camera is actually a Contax 645 with a modified Megavision F B4040 back (sixteen megapixel). The back has had an array of 90,000 micr olenses mounted in front of the sensor (with a gap between the array and the sensor). These microlenses create a unique image on the sensor surf ace which includes not only the amount of light deposited at that locati on, but how much light arrives along each ray. The image is then reconst ructed in software and a focus point can be chosen. Note that the final resolution is the same as the number of microlenses. Phil: An interesting development of a technology which is at least thinki ng differently than the current trend to simply keep increasing megapixe ls. Obviously the disadvantage here is you're getting a pretty low resol ution image, the advantages are the ability to focus after the event, to shoot at large apertures and still achieve small aperture depth of fiel d and hence also use faster shutter speeds and/or lower sensitivities. I t would be refreshing to see more 'blue sky' thinking from some of the m ajor manufacturers (and not just bigger LCD's too).
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graphics.stanford.edu/papers/lfcamera -> graphics.stanford.edu/papers/lfcamera/
Photographs digitally refocused at different depths, computed after a sin gle exposure of our light field camera. The fourth image shows what a c onventional camera would have produced. Abstract This paper presents a camera that samples the 4D light field on its senso r in a single photographic exposure. This is achieved by inserting a mic rolens array between the sensor and main lens, creating a plenoptic came ra. Each microlens measures not just the total amount of light deposited at that location, but how much light arrives along each ray. By re-sort ing the measured rays of light to where they would have terminated in sl ightly different, synthetic cameras, we can compute sharp photographs fo cused at different depths. We show that a linear increase in the resolut ion of images under each microlens results in a linear increase in the s harpness of the refocused photographs. This property allows us to extend the depth of field of the camera without reducing the aperture, enablin g shorter exposures and lower image noise. Especially in the macrophotog raphy regime, we demonstrate that we can also compute synthetic photogra phs from a range of different viewpoints. These capabilities argue for a different strategy in designing photographic imaging systems. To the photographer, the plenoptic camera operates exactly like an ordina ry hand-held camera. We have used our prototype to take hundreds of ligh t field photographs, and we present examples of portraits, high-speed ac tion and macro close-ups.