Plenoptic camera

4D light field
Camera
Compound eye
Integral imaging
Lenticular
Main Page
Megapixel
Microlens
Photo
Plenoptic camera
Stanford University
Stereo camera

A plenoptic camera, also called a light-field 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. Such light field information can be used to improve the solution of computer graphics related problems. Adelson and Wang1 propose the design of a plenoptic camera that can be used to significantly reduce the correspondence problem in stereo matching. For this an array of microlenses is placed at the focal plane of the camera main lens. The image sensor is positioned slightly behind the microlenses. Using such images the displacement of image parts that are not in focus can be analyzed and depth information can be extracted. The same camera system can be used to enable the possibility to refocus an image virtually on a computer after the picture has been taken as explained by Ng et al.2 The drawback of such a system is the low resolution that the final images have. As one microlens samples the light directions at one spatial point an increase in the number of image pixels can only be done by increasing the number of microlenses by the same amount. To overcome this limitation, Lumsdaine and Georgiev3 describe a new design of a plenoptic camera, called focused plenoptic camera where the microlens array is positioned in front of or behind the focal plane of the main lens. This modification samples the light field in a different way that allows to have a higher spatial resolution by having a lower angular resolution the same time. With this design images can be refocused with a much higher spatial resolution. However the low angular resolution can introduce some unwanted aliasing artefacts. Contents 1 Image refocussing 2 Stereo with plenoptic cameras 3 Adobe light field camera 4 See also 5 References 6 External links Image refocussing

Cameras Post production This is still a prototype but Stanford University has a working camera that is able to fix all focus issues in post production Some of the results are just too hard to believe And according
http://www.dvguru.com/2005/11/25/camera-that-fixes-all-out-of-focus-shots

Plenoptic Seagull "compositional photograph"

Light Field Photography with a Hand-Held Plenoptic Camera
The fourth image shows what a conventional camera would have produced. ... To the photographer, the plenoptic camera operates exactly like an ordinary hand-held camera. ...

Rendering Techniques 2001: Proceedings of the Eurographics Workshop in London, United Kingdom, June 25-27, 2001 Springer

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.2 Stereo with plenoptic cameras Plenoptic cameras are good for following moving objects.4 A recording from a security camera based upon this technology could be used to produce an accurate 3D model of a suspect.5 Adobe light field camera

A plenoptic image of Lego pyramid The array of bright spots indicates the structure of the lenticular array Note the image of the pyramid is barely visible
http://www-bcs.mit.edu/people/jyawang/demos/plenoptic/plenoptic.html

Eye Design in the Plenoptic Space of Light Rays - Part 3

Todor Georgiev - Photoshop - Adobe
Light Field HDR project High resolution capture of HDR, Multispectral color, Polarization and other plenoptic function modalities with Plenoptic 2.0 Camera. ...

Camera Introduction: Olympus Pen F, Panasonic Lumix Dmc-L10, Finepix S5 Pro, Canon Eos-1ds, Panasonic Lumix Dmc-Fz8, Chinon Genesis Iv Books LLC

The Adobe light-field camera is a prototype 100-megapixel camera that takes a three-dimensional photo of the scene in focus using 19 uniquely configured lenses. Each lens will take a 5.2 megapixel photo of the entire scene around the camera and each image can be focused later in any way.6 See also Compound eye Integral imaging References ^ E. H. Adelson and J. Y. A. Wang. Single Lens Stereo with Plenoptic Camera. IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. 14, No. 2, pp. 99-106, February 1992. ^ a b R. Ng, M. Levoy, M. Bredif, G. Duval, M. Horowitz, and P. Hanrahan. Light Field Photography with a Hand-Held Plenoptic Camera. Stanford University Computer Science Tech Report CSTR 2005-02, April 2005. ^ Lumsdaine, A., Georgiev, T., The Focused Plenoptic Camera, ICCP, April 2009. ^ "Polydioptric" cameras, says good for following moving objects. ^ Computer scientists create a 'light field camera' that banishes fuzzy photos, Anne Strehlow. Stanford Report. November 3, 2005. ^ Keats, Jonathon; Holland, Kris and McLeod, Gary. "PopSci's How It Works - 100 Megapixel Camera" (Adobe Flash). PopSci.com. Popular Science. Archived from the original on 2009-01-17. http://web.archive.org/web/20080117075834/http://www.time4.com/time4/microsites/popsci/howitworks/lightfield_camera.html. Retrieved 26 July 2009. External links Article by Ren Ng of Stanford (now at Refocus Imaging) Refocus Imaging, a Stanford spinoff. Say Sayonara to Blurry Pics. Wired. Fourier slice photography

http://www.tgeorgiev.net/CVPR/Vario-Plenoptic.html

Eye Design in the Plenoptic Space of Light Rays - Part 2

Focused Plenoptic Camera and Rendering Focused Plenoptic ...
Plenoptic cameras, constructed with internal microlens arrays, capture both spatial. and angular information, i.e., the full four-dimensional radiance, of a scene. ...