Science

Holographic cameras reconstruct objects that turn corners in milliseconds

Blind corners have long plagued drivers, but may not pose such a danger for that long. Researchers at Northwestern University have reconstructed waves of scattered light to create a new holographic camera that can turn corners and peep fast enough to find fast-moving objects such as cars and pedestrians. Developed the technology.

When light hits an object, it scatters, part of which reaches the retina and camera sensors, making the object visible. Of course, that means you can’t see the object behind other objects or through a scatter medium such as fog or skin. However, there may be a way to look around the corners using light scattering from multiple objects.

With the mirror in place correctly, you can see objects around the corners. The principle applies even without a mirror. This means that the quadratic object scatters too much light to reconstruct the target.But a new technology called Out of sight (NLoS) Imaging can do just that.

The NLoS system works by bouncing off the surface, hitting an object, bouncing off the surface, and then emitting light back to the sensor. The algorithm can create an image of an object just around the corner. However, as you can imagine, images reconstructed this way can often be low resolution or take too long to process.

It gets better because the technique works even at night and in foggy weather conditions

Researchers in this new study say their new technology will improve both of these problems. They call it synthetic wavelength holography and work by merging the light waves from the two lasers into the synthetic light wave. You can emit synthetic light waves to generate a three-dimensional “holographic” image of an object around a corner or behind other scattering media.

“If we can capture the entire light field of an object with a hologram, we can reconstruct the entire 3D shape of the object,” said Florian Willomitzer, lead author of the study. “This holographic imaging uses synthetic waves instead of regular light waves, at corners and through scatterers.”

According to the team, the system can capture details of objects lurking in a large angle of view, very fast within 46 milliseconds.This is fast enough to see and react to cars and pedestrians approaching from the blind spot, which is a significant improvement over others. Early NLoS system The calculation took over an hour.

“This technology turns the wall into a mirror,” says Willomizer. “This technique works better at night and in foggy weather conditions.”

The team says the technology can ultimately be used not only to enable vehicles to detect invisible dangers, but also to improve endoscopy in both industrial and medical situations. .. The camera system may not need to bend or bend the pipes or intestines, but it can scout ahead by emitting synthetic light waves and observing how they return.

“Our technology will usher in a new wave of imaging capabilities,” says Willomizer. “Our current sensor prototypes use visible or infrared light, but the principle is universal and can be extended to other wavelengths. For example, the same method can be used for space exploration and underwater. It can be applied to radio waves for acoustic imaging. It can be applied to many areas and we just scratched the surface. “

The study was published in the journal Nature Communications..

sauce: Northwestern University



https://newatlas.com/technology/holographic-camera-non-line-sight-imaging/ Holographic cameras reconstruct objects that turn corners in milliseconds

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