Covert sensing of objects around a corner may soon become a reality.
Aristide Dogariu, a University of Central Florida Pegasus Professor of Optics and Photonics, and his colleagues published a paper in Nature Communications this month demonstrating how to passively sense an object even when direct vision is impeded.
It’s a bit complicated, but the new sensing method the UCF team developed could lends itself to a number of practical applications, including use in defense, surveillance, search and rescue and medicine.
Imagine trying to see something around a corner. This is easily done with mirrors, but imagine that light from the object can only reach the detector after it bounces off a diffusing wall that acts like a shattered mirror. Even though light looks totally dispersed, some of its initial properties do not completely vanish. Dogariu and his colleagues were able to measure subtle similarities in the scattered light, undo the effects of this broken mirror, and get an idea of what lies around the corner.
“The fact that fundamental properties are not completely destroyed when light bounces off a diffuse medium like a wall can be used in so many different ways,” says Dogariu. “The question is, how much information you can still recover through this broken mirror-like surface.”
When a digital picture is taken, the spatial distribution of light across an object is mapped point by point, pixel by pixel, onto the plane of the camera. However, in its propagation from object to the camera, properties of light can be affected by what the light reflects off of. When it reflects off of a mirror, a clear image can be produced. But when it is reflected off of a shattered mirror, for example, the direction of light is altered and only a distorted version of the image can be seen.
Dogariu and his colleagues have found a way to describe how this measure of similarity between two points, called spatial coherence of light, transfers in a reflection from a diffuse wall. By learning how the light transforms, the researchers can determine where the light came from. Dogariu describes their findings as an aspect of light propagation that has simply been overlooked before. By undoing the effects of the diffusing wall, Dogariu and his colleagues have eliminated the need to control the light that illuminates the target object.
This is the first time that there has been a practical demonstration of passively detecting an object around a corner in this way.
The technique does not recover a complete image but collects more than enough information needed for task oriented surveillance.
“The potential of this technique goes beyond sensing,” says George Atia, a professor in EECS and member of a larger UCF team funded under Defense Advanced Research Projects Agency’s Revolutionary Enhancement of Visibility by Exploiting Active Light-fields project that initiated this research. “Based on results of our recent simulations, we envision that non-line-of-sight, passive imaging of complex scenes could be achieved by data fusing that combines spatial coherence with additional intensity information.”
Until now, detection of objects around a corner has only been possible by emitting light toward the object and modifying some of its properties, say by sending a pulse of light, the light will bounce off the diffuse wall, onto the object, to the diffuse wall again, and back to the detector. The amount of time the light takes to return to the detector is then used to triangulate the position of the object. The problem with such methods is that the emission of light discloses the intent to see, which can be problematic in covert situations.
The new sensing method is not specific to light. It could be applied for example to infrared or microwaves radiation.
Receive an email update when we add a new SEEING AROUND CORNERS article.
The Latest on: Seeing around corners
via Google News
The Latest on: Seeing around corners
- Why a Rabbittown corner store tells more than just a family's tale on November 12, 2018 at 8:48 pm
working-class people and for many of the people settling in St. John's from countries around the world. But she's been sad to see the corner stores disappear, a phenomenon not even Rabbittown could av... […]
- When Is The Spice Girls Reunion Tour? What You Really, Really Want Is Around The Corner on November 12, 2018 at 11:32 am
90s kids everywhere really, really want to know the answer. (See what I did there? Of course you did.) According to Entertainment Weekly, the highly anticipated second reunion tour was slated to kick ... […]
- Christmas Bird Count just around the corner on November 10, 2018 at 5:04 am
Every year, a citizen science project known as the Christmas Bird Count happens across the nation where birders spend a day counting bird species they see within designated ... land use and numbers of ... […]
- If I normally follow my ex when I see her to the store up the block or around the corner is that considered stalking? on November 9, 2018 at 6:59 pm
@colette: I don't have her number to call her anymore, She blocked me when we broke up so the only way I can talk to her is when I see her. When I do talk to her she's not upset she says ... […]
- ‘A Private War’ gives gritty glimpse into wars we see but never experience on November 9, 2018 at 2:10 pm
you know the shiny golden statues are just around the corner, ready to be presented. With a strong female lead, a plot based on a true story and Oscar-nominated actors, “A Private War” features a clas... […]
- Here's where you can see holiday tree lightings and displays in the Milwaukee area on November 9, 2018 at 7:22 am
(414) 931-0808; pabstmansion.com The Corners of Brookfield: Lighting of The Corners, 5-7 p.m. Nov. 17. See Santa and reindeer ... Fantastic Forest: Animals from Around the World! Dec. 1-28. View anima... […]
- Editor’s Corner—5G is in the eye of the beholder on November 8, 2018 at 7:46 am
Operators around the world are in various stages of deploying NB-IoT ... he mentioned that he’s excited to see who the next Uber is going to be in the healthcare industry—as an example of what 5G can ... […]
- Kareem Jackson 'killing it' at corner and safety for Texans on November 8, 2018 at 5:03 am
In nine games, Jackson has played 398 snaps at corner -- moving around the field quite a bit -- and 148 snaps ... Bills • K.J. Wright has half a season to earn his spot • Saints see Dez worth the risk ... […]
- Several major county road projects around the corner on November 5, 2018 at 11:19 pm
Initial estimates would see the project complete in around 10 weeks, but Austin said the contractor may finish before that. Austin said Public Works will try to avoid any overlap between the Sea ... […]
via Bing News