Plenoptic camera

Plenoptic camera

A plenoptic camera, also called a "light-field camera", and more correctly called a "polydioptric" camera, is a camera that uses a microlens array (also known as a lenticular lens array) to capture 4D light field information about a scene. According to John Y. A. Wang, "The novel optics eliminates spatial aliasing, correspondence and aperture problems, and temporal aliasing problems present in conventional stereo and structure from motion". [ [http://www-bcs.mit.edu/people/jyawang/demos/plenoptic/plenoptic.html Article by John Y. A. Wang of MIT] discussing research by E. H. Adelson and John Y. A. Wang on creating 3D images with a modified standard digital camera. The relative order of objects can be calculated. The article includes references and US patent information.]

A team at Stanford University used a 16 megapixel camera with a 90,000-microlens array (meaning that each microlens covers about 175 pixels, and the final resolution is 90 kilopixels) to demonstrate that pictures can be refocused after they are taken, including bringing the entire image into focus. [ [http://graphics.stanford.edu/papers/lfcamera/lfcamera-150dpi.pdf Report by Ren Ng, Marc Levoy, Mathieu Brédif, Mark Horowitz, and Pat Hanrahan of Stanford and Gene Duval of Duval Design] on processing plenoptic camera images to refocus the images after the picture has been taken. The team used a 16 megapixel camera with 90,000 microlenses.]

The microlens array sits between the lens of the camera and the image sensor. It refocuses light onto the image sensor to create many small images taken from slightly different viewpoints, which are manipulated by software to extract depth information.

Plenoptic cameras are good for following moving objects. [ [http://www.cfar.umd.edu/~jneumann/videogeometry/polydioptric.htm "Polydioptric" cameras] , says good for following moving objects.] A recording from a security camera based upon this technology could be used to produce an accurate 3D model of a suspect. [ [http://news-service.stanford.edu/news/2005/november9/camera-110205.html Computer scientists create a 'light field camera' that banishes fuzzy photos] , BY ANNE STREHLOW. Stanford Report. November 3, 2005.]

References

* [http://graphics.stanford.edu/papers/lfcamera Article by Ren Ng of Stanford] (now at Refocus Imaging)
* [http://www.refocusimaging.com Refocus Imaging] , a Stanford spinoff.
* [http://www.wired.com/news/technology/0,69594-0.html Say Sayonara to Blurry Pics] . Wired.
* [http://graphics.stanford.edu/papers/fourierphoto Fourier slice photography]


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Camera — For other uses, see Camera (disambiguation). Various cameras A camera is a device that records and stores images. These images may be still photographs or moving images such as videos or movies. The term camera comes from the camera obscura… …   Wikipedia

  • Stereo camera — A stereo camera is a type of camera with two or more lenses. This allows the camera to simulate human binocular vision, and therefore gives it the ability to capture three dimensional images, a process known as stereo photography. Stereo cameras… …   Wikipedia

  • Light field — The light field is a function that describes the amount of light traveling in every direction through every point in space. Michael Faraday was the first to propose (in an 1846 lecture entitled Thoughts on Ray Vibrations ) that light should be… …   Wikipedia

  • Depth of field — The area within the depth of field appears sharp, while the areas in front of and beyond the depth of field appear blurry …   Wikipedia

  • Range imaging — is the name for a collection of techniques which are used to produce a 2D image showing the distance to points in a scene from a specific point, normally associated with some type of sensor device.The resulting image, the range image , has pixel… …   Wikipedia

  • Lichtfeld — Das Lichtfeld ist eine Funktion, welche die Lichtmenge beschreibt, die an jedem Punkt des dreidimensionalen Raums in alle Richtungen fällt. Inhaltsverzeichnis 1 Geschichte 2 Die Plenoptische Funktion 3 Das 4 D Lichtfeld …   Deutsch Wikipedia

  • Plenoptische Kamera — Plenoptische Funktion Eine plenoptische Kamera, auch Lichtfeldkamera genannt, erfasst das 4 D Lichtfeld einer Szene. Im Gegensatz dazu erfasst eine konventionelle Kamera nur ein 2 D Bild. Bei einem 4 D Lichtfeld ist nicht nur die Position und… …   Deutsch Wikipedia

  • Autofocus — For the film of the same name, see Auto Focus. An autofocus (or AF) optical system uses a sensor, a control system and a motor to focus fully automatic or on a manually selected point or area. An electronic rangefinder has a display instead of… …   Wikipedia

  • Пленоптическая камера — Lytro Пленоптическая камера. Пленоптическая камера ( …   Википедия

  • Focus stacking — is a digital image processing technique which combines multiple images taken at different focus distances to give a resulting image with a greater depth of field (DOF) than any of the individual source images. Getting sufficient depth of field… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”