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LENS-FREE CAMERAS

FOCUS ON INNOVATION

Elementary!  For a camera to work it must have a lens!  Simple as that!  No waiting around for something else to develop!  (Couldn’t resist).  The purpose of that small piece of glass is to direct light to the camera’s sensor so that it can produce an image. It’s worked fine since cameras were invented.

Researchers ever focusing their attention on what might be possible, ever reaching beyond their grasp have found a way to capture images and even video without what has been thought as this essential component.

Lens-free!

Picture this!  Researchers at the University of Utah published their study in the Journal Optics Express.  I quote:

A NEW PERSPECTIVE.

If you were to remove the lens from a standard camera — like, say, the one in your smartphone — you’d still be able to take a photo, but there’d be pretty much no point because it would look like a pixelated blob that no amount of Photoshop magic could fix.

The researchers behind this study suspected that they could train an algorithm to decipher the image and make it look like one taken using a lens.

Why don’t we think from the ground up to design cameras that are optimized for machines and not humans.

That’s my philosophical point,” said study author Rajesh Menon in a news release.

To do this, the researchers started by attaching a digital camera sensor to the edge of a sheet of plexiglass, pointing it toward the glass. Then they wrapped reflective tape around the remaining edges of the plexiglass to direct light back towards the sensor.

Using the sensor, the researchers snapped pictures and video of several images displayed on an LED screen in front of the plexiglass (and at a 90-degree angle to the sensor).

Finally, they had their algorithm interpret the image to produce one that looks like a slightly lower resolution version of what they displayed on the LED screen.

 

APPLICATIONS APLENTY.

Why should we even spend time making a lens-less camera? Turns out, there are lots of uses. We could use them to turn the windows of autonomous vehicles into cameras, or turn the windows of our homes into a security system.

A lens-free camera would make augmented reality (AR) glasses a lot less bulky, since you wouldn’t have to point heavy cameras at the wearer’s eyes — we could instead place sleeker sensors on the edges of the glasses.

“It’s not a one-size-fits-all solution, but it opens up an interesting way to think about imaging systems,” said Menon in the release.

For now, he and his colleagues plan to continue developing their lens-free camera system to effectively capture 3-D images and objects bathed in normal light, the not-insanely-bright kind you probably encounter at home.

If their work goes as the researchers hope, the lens may no longer be a necessary component of a camera — maybe it’ll just be an optional one.

Read on about this amazing eye opening topic.

OSA Recommended Articles

Image processing for cameras with fiber bundle image relay

Stephen J. Olivas, Ashkan Arianpour, Igor Stamenov, Rick Morrison, Ron A. Stack, Adam R. Johnson, Ilya P. Agurok, and Joseph E. Ford

Appl. Opt. 54(5) 1124-1137 (2015)

Computational multispectral video imaging [Invited]

Peng Wang and Rajesh Menon

  1. Opt. Soc. Am. A 35(1) 189-199 (2018)

Lensless photography with only an image sensor

Ganghun Kim, Kyle Isaacson, Rachael Palmer, and Rajesh Menon

Appl. Opt. 56(23) 6450-6456 (2017)

We’ve selected a few more videos which are very informative.  Watch!

Lensless Cameras

Aug 29, 2018 | Lensless Cameras

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