Light Field Photography with a Handheld （光场与手持摄影）.pdf

Stanford Tech Report CTSR 2005-02 Light Field Photography with a Hand-held Plenoptic Camera ∗ ∗ ´ ∗ † ∗ ∗ Ren Ng Marc Levoy Mathieu Bredif Gene Duval Mark Horowitz Pat Hanrahan ∗Stanford University †Duval Design Abstract Externally, our hand-held light field camera looks and operates exactly like a conventional camera: the viewfinder, focusing mech- This paper presents a camera that samples the 4D light field on its anism, length of exposure, etc. are identical. Internally, we aug- sensor in a single photographic exposure. This is achieved by in- ment the 2D photosensor by placing a microlens array in front of serting a microlens array between the sensor and main lens, creat- it, as proposed by Adelson and Wang [1992] in their work on the ing a plenoptic camera. Each microlens measures not just the total “plenoptic camera” (They did not build this device, but prototyped amount of light deposited at that location, but how much light ar- a non-portable version containing a relay lens.) Each microlens rives along each ray. By re-sorting the measured rays of light to forms a tiny sharp image of the lens aperture, measuring the direc- where they would have terminated in slightly different, synthetic tional distribution of light at that microlens. cameras, we can compute sharp photographs focused at different