Unbounded high dynamic range photography

Hang Zhao, Boxin Shi, Christy Cull, Sai-Kit Yeung, Ramesh Raskar

A compact structured light based otoscope for three dimensional imaging of the tympanic membrane

Anshuman J. Das, Julio C. Estrada, Zhifei Ge, Sara Dolcetti, Deborah Chen, Ramesh Raskar
Proc. SPIE 9303, Photonic Therapeutics and Diagnostics XI, 93031F

Time-of-Flight Microwave Camera

Gregory Charvat, Andrew Temme, Micha Feign, Ramesh Raskar
Nature Scientific Reports 5, Article number: 14709


Microwaves can penetrate many obstructions that are opaque at visible wavelengths, however microwave imaging is challenging due to resolution limits associated with relatively small apertures and unrecoverable “stealth” regions due to the specularity of most objects at microwave frequencies. We demonstrate a multispectral time-of-flight microwave imaging system which overcomes these challenges with a large passive aperture to improve lateral resolution, multiple illumination points with a data fusion method to reduce stealth regions, and a frequency modulated continuous wave (FMCW) receiver to achieve depth resolution. The camera captures images with a resolution of 1.5 degrees, multispectral images across the X frequency band (8 GHz–12 GHz), and a time resolution of 200 ps (6 cm optical path in free space). Images are taken of objects in free space as well as behind drywall and plywood. This architecture allows “camera-like” behavior from a microwave imaging system and is practical for imaging everyday objects in the microwave spectrum.

Read the full article here

Super-Resolution in Phase Space

Ayush Bhandari, Yonina Eldar and Ramesh Raskar
Proc. of IEEE Intl. Conf. on Acoustics, Speech and Signal Processing (ICASSP)



SpecTrans: Versatile Material Classification for Interaction with Textureless, Specular and Transparent Surfaces

Munehiko Sato, Shigeo Yoshida, Alex Olwal, Boxin Shi, Atsushi Hiyama, Tomohiro Tanikawa Michitaka Hirose, and Ramesh Raskar
In Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems (CHI '15). ACM, New York, NY, USA, Pages 2191-2200. DOI=10.1145/2702123.2702169 http://doi.acm.org/10.1145/2702123.2702169

Single-photon sensitive light-in-fight imaging

G. Gariepy, N. Krstaji, R. Henderson, C. Li, R. R. Thomson, G. S. Buller, B. Heshmat, R. Raskar, J. Leach, D. Faccio
Nature Communications 6, 6021

Locating and classifying fluorescent tags behind turbid layers using time-resolved inversion

Guy Satat, Barmak Heshmat, Christopher Barsi, Dan Raviv, Ou Chen, Moungi G. Bawendi, Ramesh Raskar
Nature Communications 6:6796 doi: 10.1038/ncomms7796

A Light Transport Model for Mitigating Multipath Interference in Time-of-flight Sensors

Nikhil Naik, Achuta Kadambi, Christoph Rhemann, Shahram Izadi, Ramesh Raskar, Sing Bing Kang

Sub-pixel layout for super-resolution with images in an octic group

Boxin Shi, Hang Zhao, Moshe Ben-Ezra, Sai-Kit Yeung, Christy Cull, Hamilton Shepard, Christopher Barsi and Ramesh Raska

Streetscore–Predicting the Perceived Safety of One Million Streetscapes

Nikhil Naik, Jade Philipoom, Ramesh Raskar, Cesar Hidalgo
CVPR Workshops

Sparse linear operator identification without sparse regularization? applications to mixed pixel problem in time-of-flight/range imaging

Ayush Bhandari, Achuta Kadambi, Ramesh Raskar

Skin Perufion Photography

Guy Satat, Christopher Barsi and Ramesh Raskar

Single-shot ultrafast imaging using parallax-free alignment with a tilted lenslet array

Barmak Heshmat, Guy Satat, Christopher Barsi, and Ramesh Raskar

Seeing around corners with a mobile phone?: synthetic aperture audio imaging

Hisham Bedri, Micha Feigin, Michael Everett, Ivan Filho, Gregory Charvat, Ramesh Raskar

Resolving multipath interference in time-of-flight imaging via modulation frequency diversity and sparse regularization,

Ayush Bhandari, Achuta Kadambi, Refael Whyte, Christopher Barsi, Micha Feigin, Adrian Dorrington, Ramesh Raskar
Optics Letters
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