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.

"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 July 28, 2014 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 July 28, 2014).

Share This




More Matter & Energy News

Monday, July 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Europe's Highest Train Turns 80 in French Pyrenees

Europe's Highest Train Turns 80 in French Pyrenees

AFP (July 25, 2014) Europe's highest train, the little train of Artouste in the French Pyrenees, celebrates its 80th birthday. Duration: 01:05 Video provided by AFP
Powered by NewsLook.com
TSA Administrator on Politics and Flight Bans

TSA Administrator on Politics and Flight Bans

AP (July 24, 2014) TSA administrator, John Pistole's took part in the Aspen Security Forum 2014, where he answered questions on lifting of the ban on flights into Israel's Tel Aviv airport and whether politics played a role in lifting the ban. (July 24) Video provided by AP
Powered by NewsLook.com
Creative Makeovers for Ugly Cellphone Towers

Creative Makeovers for Ugly Cellphone Towers

AP (July 24, 2014) Mobile phone companies and communities across the country are going to new lengths to disguise those unsightly cellphone towers. From a church bell tower to a flagpole, even a pencil, some towers are trying to make a point. (July 24) Video provided by AP
Powered by NewsLook.com
Algonquin Power Goes Activist on Its Target Gas Natural

Algonquin Power Goes Activist on Its Target Gas Natural

TheStreet (July 23, 2014) When The Deal's Amanda Levin exclusively reported that Gas Natural had been talking to potential suitors, the Ohio company responded with a flat denial, claiming its board had not talked to anyone about a possible sale. Lo and behold, Canadian utility Algonquin Power and Utilities not only had approached the company, but it did it three times. Its last offer was for $13 per share as Gas Natural's was trading at a 60-day moving average of about $12.50 per share. Now Algonquin, which has a 4.9% stake in Gas Natural, has taken its case to shareholders, calling on them to back its proposals or, possibly, a change in the target's board. Video provided by TheStreet
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:
from the past week

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