Featured Research

from universities, journals, and other organizations

Zoomable holograms pave the way for versatile, portable projectors

Date:
October 15, 2013
Source:
The Optical Society
Summary:
Imagine giving a presentation to a roomful of customers when suddenly the projector fails. You whip out your smartphone, beam your PowerPoint presentation onto the conference room screen, and are back in business within seconds. This career-saving application and others like it are the promise of a new generation of ultra-small projectors. Researchers have now taken an important step toward making such devices more versatile and easier to integrate into portable electronic devices.

These two still photos show the same holographic image. In the second photo the image has been magnified by the lensless projector.
Credit: Tomoyoshi Shimobaba, Chiba University and Michal Makowski, Warsaw University of Technology

Imagine giving a presentation to a roomful of important customers when suddenly the projector fails. You whip out your smartphone, beam your PowerPoint presentation onto the conference room screen, and are back in business within seconds. This career-saving application and others like it are the promise of a new generation of ultra-small projectors. Now researchers from Japan and Poland have taken an important step toward making such devices more versatile and easier to integrate into portable electronic devices.

Related Articles


The team has created a small holographic projection system with a lensless zoom function. When fully developed the system should be cheaper and smaller than other projection systems. The researchers report their findings in a paper published today in the Optical Society's (OSA) journal Optics Express.

Zoom functions magnify an image to fit on an arbitrarily sized screen, but they typically require complicated lenses and mechanical components. "A zoom lens in general projectors occupies a large area in the systems," said Tomoyoshi Shimobaba, a professor in the graduate school of engineering at Chiba University in Japan. "If I remove the zoom lens, the system will be small and cost-saving."

Though the new holographic lensless zoom is not the first lensless zoom system to be developed, Shimobaba notes that other systems require extra components. His team's system requires only a laser and an LCD panel.

In order to achieve a lensless zoom, Shimobaba, his colleagues from Chiba University, and Michal Makowski from the Warsaw University of Technology in Poland turned to holography. Holography is a way to produce images by using the interference pattern of two laser beams to encode and later display the image. By their nature holograms operate without lenses. It is possible to represent a holographic image with numbers and formulas and then calculate how that image can be magnified.

Shimobaba and his team made modifications to the standard magnification formulas to reduce calculation time and preserve image quality. Magnified holograms can suffer from a signal processing effect called aliasing, which can result in visual distortions of the original image. The researchers developed a calculation to reduce aliasing effects and also used a method developed by another team of researchers to reduce the speckle noise effect that can give holograms a grainy appearance. They tested the technique by increasing by nine times the size of a monochrome picture of a woman in a feathered hat.

Currently the footprint of the holographic zoom system is about 160x80x40 millimeters, and Shimobaba believes the researchers can easily shrink it even further. "Currently we use commercial parts," he said. "However, if we customize the components we believe we can develop the smallest projector [to date] because our technique is in principle the simplest." He estimates that the technology could be commercialized in the next five to ten years.

Going forward the researchers plan to refine their mathematical image manipulation techniques to further improve image quality and reduce calculation time. They also plan to test the technique with color images.


Story Source:

The above story is based on materials provided by The Optical Society. Note: Materials may be edited for content and length.


Journal Reference:

  1. Tomoyoshi Shimobaba, Michal Makowski, Takashi Kakue, Minoru Oikawa, Naohisa Okada, Yutaka Endo, Ryuji Hirayama, Tomoyoshi Ito. Lensless zoomable holographic projection using scaled Fresnel diffraction. Optics Express, 2013; 21 (21): 25285 DOI: 10.1364/OE.21.025285

Cite This Page:

The Optical Society. "Zoomable holograms pave the way for versatile, portable projectors." ScienceDaily. ScienceDaily, 15 October 2013. <www.sciencedaily.com/releases/2013/10/131015191403.htm>.
The Optical Society. (2013, October 15). Zoomable holograms pave the way for versatile, portable projectors. ScienceDaily. Retrieved October 25, 2014 from www.sciencedaily.com/releases/2013/10/131015191403.htm
The Optical Society. "Zoomable holograms pave the way for versatile, portable projectors." ScienceDaily. www.sciencedaily.com/releases/2013/10/131015191403.htm (accessed October 25, 2014).

Share This



More Matter & Energy News

Saturday, October 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

IKEA Desk Converts From Standing to Sitting With One Button

IKEA Desk Converts From Standing to Sitting With One Button

Buzz60 (Oct. 24, 2014) IKEA is out with a new convertible desk that can convert from a sitting desk to a standing one with just the push of a button. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com
Ebola Protective Suits Being Made in China

Ebola Protective Suits Being Made in China

AFP (Oct. 24, 2014) A factory in China is busy making Ebola protective suits for healthcare workers and others fighting the spread of the virus. Duration: 00:38 Video provided by AFP
Powered by NewsLook.com
Real-Life Transformer Robot Walks, Then Folds Into a Car

Real-Life Transformer Robot Walks, Then Folds Into a Car

Buzz60 (Oct. 24, 2014) Brave Robotics and Asratec teamed with original Transformers toy company Tomy to create a functional 5-foot-tall humanoid robot that can march and fold itself into a 3-foot-long sports car. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Police Testing New Gunfire Tracking Technology

Police Testing New Gunfire Tracking Technology

AP (Oct. 24, 2014) A California-based startup has designed new law enforcement technology that aims to automatically alert dispatch when an officer's gun is unholstered and fired. Two law enforcement agencies are currently testing the technology. (Oct. 24) Video provided by AP
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