Science Daily November 17, 2021 A team of researchers in the US (Northwestern University, Southern Methodist University) has invented a new method called synthetic wavelength holography. By capturing the entire light field of an object in a hologram, it is possible to reconstruct the object’s three-dimensional shape in its entirety. They captured holographic imaging around a corner or through scatterers — with synthetic waves instead of normal light waves. From there, an algorithm reconstructed the scattered light signal to reveal the hidden objects. The system could rapidly capture full-field images of large areas with submillimeter precision. To eliminate the need […]
Tag Archives: Non-line-of -sight-imaging
Non-line-of-sight imaging with picosecond temporal resolution
Phys.org August 12, 2021 Non-line-of-sight (NLOS) imaging enables monitoring around corners and is promising for diverse applications. The resolution of transient NLOS imaging is limited to a centimeter scale, mainly by the temporal resolution of the detectors. Researchers in China have constructed an up-conversion single-photon detector with a high temporal resolution of ∼1.4 ps and a low noise count rate of 5 counts per second (cps). The detector operates at room temperature, near-infrared wavelength. They demonstrated high-resolution and low-noise NLOS imaging. The system can provide a 180 μm axial resolution and a 2 mm lateral resolution, which is more than […]
Lessons of conventional imaging let scientists see around corners
Science Daily August 5, 2019 An international team of researchers (USA – University of Wisconsin, Spain) shows that the problem of non-line-of-sight imaging can also be formulated as one of diffractive wave propagation, by introducing a virtual wave field that they call the phasor field. Their method yields a new class of imaging algorithms that mimic the capabilities of line-of-sight cameras. They demonstrated non-line-of-sight imaging of complex scenes with strong multiple scattering and ambient light, arbitrary materials, large depth range and occlusions. Their method handles these challenging cases without explicitly inverting a light-transport model. Once perfected, it could be used […]
The New Science of Seeing Around Corners
Quanta Magazine August 30, 2018 Researchers at MIT showed that the changing light on the wall of a room, filmed with nothing fancier than an iPhone, can be processed to reveal the scene outside the window. In 2014 a man said “Mary had a little lamb…” an empty chip bag. They filmed the motion of the chip bag and reconstructed audio. DARPA’s REVEAL program (Revolutionary Enhancement of Visibility by Exploiting Active Light-fields) was partly inspired by these findings. REVEAL has been making non-line-of-sight imaging ever more powerful and practical… read more. Open Access TECHNICAL ARTICLE 1 , TECHNICAL ARTICLE 2