Featured Research

from universities, journals, and other organizations

Lensless Camera Captures Three-Dimensional Images

Date:
July 9, 1999
Source:
University Of Illinois At Urbana-Champaign
Summary:
Using principles gleaned from radio astronomy and medical X-ray tomography, researchers at the University of Illinois have assembled an optical system that produces three-dimensional reconstructions of objects without using a lens.

CHAMPAIGN, Ill. -- Using principles gleaned from radio astronomy and medical X-ray tomography, researchers at the University of Illinois have assembled an optical system that produces three-dimensional reconstructions of objects without using a lens.

Related Articles


"One big advantage of designing a lensless 3-D camera is that the resulting optical system has an infinite depth of field," said Ronald Stack, a research engineer with the U. of I.'s Beckman Institute for Advanced Science and Technology. "That means the object will always be in focus, which simplifies the amount of data processing that is required."

Instead of a lens, the camera system uses a series of beam splitters and folding mirrors to capture a sequence of "snapshots" as an object is slowly rotated in front of the aperture. The images are detected with a CCD (charge-coupled device).

"The snapshots are not like ordinary photographs, however," said David Munson Jr., a professor of electrical and computer engineering and a researcher at the Beckman Institute. "The camera collects data on interference patterns in much the same way as does a radio telescope. These two-dimensional data frames are then processed to form a 3-D representation of the object, which can be displayed on a computer screen or in a virtual reality environment."

To produce the 3-D image, the researchers rely on a reconstruction algorithm used in cone-beam tomography -- a relatively new medical X-ray photography technique that produces 3-D images of a patient, instead of the more familiar cross-sectional slices.

"With our camera, we can reconstruct 3-D objects purely from physical principles, field analysis and number crunching," Munson said. "Because our system is not based on conventional computer vision and image-processing techniques, we incorporate no tricks, heuristics or data manipulation."

Such physical optics techniques may ultimately benefit areas such as microscopy and machine vision by providing 3-D reconstructions of superior resolution.

"In a lot of current 3-D visualization activities, people need a quick and reliable way to capture 3-D information about the optical world to put into their database," Stack said. "Our camera system can also help do that, because it produces a numerical 3-D representation of the object."

In addition to Stack and Munson, the research group included team leader David Brady, a professor of electrical and computer engineering and a researcher at the Beckman Institute; Daniel Marks, a graduate research assistant at the Beckman Institute; and Rachael Brady, an expert on scientific visualization at the university's National Center for Supercomputer Applications.

The researchers described the lensless imaging system in the June 25 issue of the journal Science.


Story Source:

The above story is based on materials provided by University Of Illinois At Urbana-Champaign. Note: Materials may be edited for content and length.


Cite This Page:

University Of Illinois At Urbana-Champaign. "Lensless Camera Captures Three-Dimensional Images." ScienceDaily. ScienceDaily, 9 July 1999. <www.sciencedaily.com/releases/1999/07/990709083019.htm>.
University Of Illinois At Urbana-Champaign. (1999, July 9). Lensless Camera Captures Three-Dimensional Images. ScienceDaily. Retrieved April 21, 2015 from www.sciencedaily.com/releases/1999/07/990709083019.htm
University Of Illinois At Urbana-Champaign. "Lensless Camera Captures Three-Dimensional Images." ScienceDaily. www.sciencedaily.com/releases/1999/07/990709083019.htm (accessed April 21, 2015).

Share This


More From ScienceDaily



More Matter & Energy News

Tuesday, April 21, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Free Home Heating Offered by E-Radiators

Free Home Heating Offered by E-Radiators

Reuters - Innovations Video Online (Apr. 21, 2015) A revolutionary new radiator design offers Dutch home-owners the chance to get free heating. The e-Radiator is a computer server modified so that the heat it generates can warm a room inside a house. Jim Drury has more. Video provided by Reuters
Powered by NewsLook.com
Humanoid Robot Can Recognise and Interact With People

Humanoid Robot Can Recognise and Interact With People

Reuters - Innovations Video Online (Apr. 20, 2015) An ultra-realistic humanoid robot called &apos;Han&apos; recognises and interprets people&apos;s facial expressions and can even hold simple conversations. Developers Hanson Robotics hope androids like Han could have uses in hospitality and health care industries where face-to-face communication is vital. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Drones and Health Apps at Santiago's "Robotics Day"

Drones and Health Apps at Santiago's "Robotics Day"

AFP (Apr. 20, 2015) Latin American robotics experts gather in Santiago, Chile for "Robotics Day". Video provided by AFP
Powered by NewsLook.com
Japan Humanoid Robot Receives Customers at Department Store

Japan Humanoid Robot Receives Customers at Department Store

AFP (Apr. 20, 2015) She can smile, she can sing and she can give you guidance at one of the most upscale department stores in Tokyo...a female-looking humanoid makes her debut as a receptionist Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins