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

Scale invariant metrics of volumetric datasets

D. Raviv, and R. Raskar
SIAM Journal on Imaging Sciences, 8(1) (SIIMS), 2015. Q1, IF 2.27, Citations G. Scholar 2

RFlow: User Interaction Beyond Walls

Hisham Bedri, Otkrist Gupta, Micha Feign, Andrew Temme, Gregory Charvat, Ramesh Raskar
UIST '15 Adjunct Adjunct Proceedings of the 28th Annual ACM Symposium on User Interface Software & Technology Pages 45-46

Resolving Multipath Interference in Kinect: An Inverse Problem Approach

Feigin M., Bhandari A., Izadi S., Rhemann C., Schmidt M., Raskar R.
IEEE Sensors Journal PP (99), 1-8

Polarized 3D

Achuta Kadambi, Vage Taamazyan, Boxin Shi, Ramesh Raskar
ICCV 2015 (Oral)

Modeling “wiggling” as a multi-path interference problem in AMCW ToF imaging

Feigin M., Whyte R., Bhandari A., Dorington A., and Raskar R
Optics Express 23 (15), 19213-19225

Leveraging the Crowd for Annotation of Retinal Images

G. Leifman, T. Swedish, K. Roesch, R. Raskar
International Conference of the IEEE Engineering in Medicine and Biology Society, 2015

Imaging through thick turbid medium using time-resolved measurement

G Satat, D Raviv, B Heshmat, R Raskar
Computational Optical Sensing and Imaging, CT3F. 4, 2015

Imaging through thick turbid medium using time-resolved measurement

Guy Satat, Dan Raviv, Barmak Heshmat, and Ramesh Raskar
Imaging and Applied Optics 2015, OSA Technical Digest (online) (Optical Society of America, 2015), paper CT3F.4.

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