Bell Labs improves lensless camera with additional pixel on sensor

June 26, 2013 by Bob Yirka report
Reconstruction using measurements from two sensors. Credit: arXiv:1306.3946 [cs.IT]

(Phys.org) —A research team from Bell Labs that developed a lensless camera has now improved upon the design by adding a second pixel to the sensor used to read data coming through an aperture array. In their paper uploaded to the preprint server arXiv, the team describes how they added a second pixel to the sensor that reads incoming light from the aperture array. Doing so required additional programming of code on an associated computer to take advantage of the additional data provided by a slightly different view of the object being captured.

The camera is part of ongoing research by several groups into a technique known as optical sensing. Such devices consist of an aperture array that can be programmed to randomly allow light to pass through some of its cells, but not others. It sits between a light source and a single pixel sensor that picks up the light that passes through the array. To create an image, multiple shots are taken, each with a different random pattern created on the aperture array. The computer generates the multiple array patterns and uses the data from the sensor to create an image. In this new effort, the team added a second pixel to the tri-color sensor providing two new benefits.

The first benefit is that it allows for the creation of an image in half the time. Since data from both sensors is married via computer software into one image, rather than producing two images, twice as much data is sent during each snapshot.

The second benefit is that the addition of the second pixel allows for a higher quality image to be created. This is because the two pixels get a slightly different view of the light coming through the array, offering more data per individual shot.

As research continues with the new type of camera, it's not difficult to see where the technology is going. Adding more pixels to the aperture array, increasing processing speed, and developing ever more sophisticated software will allow for the creation of higher resolution images in shorter amounts of time. At some point, (because the results are always in focus) it seems logical to conclude that such cameras will find a place in photography applications for still images of non-moving targets—all at a much reduced price.

Explore further: New CMOS image sensor created with on-circuit color noise reduction lowers pixel noise and improves image quality

More information: Multi-view in Lensless Compressive Imaging, arXiv:1306.3946 [cs.IT] arxiv.org/abs/1306.3946

Abstract
Multi-view images are acquired by a lensless compressive imaging architecture, which consists of an aperture assembly and multiple sensors. The aperture assembly consists of a two dimensional array of aperture elements whose transmittance can be individually controlled to implement a compressive sensing matrix. For each transmittance pattern of the aperture assembly, each of the sensors takes a measurement. The measurement vectors from the multiple sensors represent multi-view images of the same scene. We present theoretical framework for multi-view reconstruction and experimental results for enhancing quality of image using multi-view.

via Arxiv Blog

Related Stories

Bell Labs researchers build camera with no lens

June 4, 2013

(Phys.org) —A small team of researchers at Bell Labs in New Jersey has built a camera that has no lens. Instead, as they explain in their paper they've uploaded to the preprint server arXiv, the camera uses a LCD array, ...

An ultrasensitive molybdenum-based image sensor

June 12, 2013

A new material has the potential to improve the sensitivity of photographic image sensors by a factor of five. In 2011, an EPFL team led by Andras Kis discovered the amazing semi-conducting properties of molybdenite (MoS2), ...

Laser guided codes advance single pixel terahertz imaging

June 25, 2013

The universe is awash in terahertz (THz) waves, as harmless as they are abundant. But unlike other regions of the electromagnetic spectrum, THz has proven to be extremely difficult to manipulate in order to capture novel ...

Recommended for you

1 comment

Adjust slider to filter visible comments by rank

Display comments: newest first

Shootist
2.3 / 5 (3) Jun 26, 2013
Is this the Bell Labs owned by Alcatel, which is owned by Iran, that Bell Labs?

The US has fallen so very far in such a short time. I think the American Republic has entered the middle Marius period, right before the end of the Roman Republic.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.