|
|
|
|
LEADER |
02585 am a22003253u 4500 |
001 |
92466 |
042 |
|
|
|a dc
|
100 |
1 |
0 |
|a Kadambi, Achuta
|e author
|
100 |
1 |
0 |
|a Massachusetts Institute of Technology. Media Laboratory
|e contributor
|
100 |
1 |
0 |
|a Program in Media Arts and Sciences
|q (Massachusetts Institute of Technology)
|e contributor
|
100 |
1 |
0 |
|a Kadambi, Achuta
|e contributor
|
100 |
1 |
0 |
|a Bhandari, Ayush
|e contributor
|
100 |
1 |
0 |
|a Barsi, Christopher
|e contributor
|
100 |
1 |
0 |
|a Raskar, Ramesh
|e contributor
|
700 |
1 |
0 |
|a Whyte, Refael
|e author
|
700 |
1 |
0 |
|a Bhandari, Ayush
|e author
|
700 |
1 |
0 |
|a Streeter, Lee
|e author
|
700 |
1 |
0 |
|a Barsi, Christopher
|e author
|
700 |
1 |
0 |
|a Dorrington, Adrian
|e author
|
700 |
1 |
0 |
|a Raskar, Ramesh
|e author
|
245 |
0 |
0 |
|a Coded time of flight cameras: sparse deconvolution to address multipath interference and recover time profiles
|
260 |
|
|
|b Association for Computing Machinery,
|c 2014-12-23T17:09:11Z.
|
856 |
|
|
|z Get fulltext
|u http://hdl.handle.net/1721.1/92466
|
520 |
|
|
|a Time of flight cameras produce real-time range maps at a relatively low cost using continuous wave amplitude modulation and demodulation. However, they are geared to measure range (or phase) for a single reflected bounce of light and suffer from systematic errors due to multipath interference. We re-purpose the conventional time of flight device for a new goal: to recover per-pixel sparse time profiles expressed as a sequence of impulses. With this modification, we show that we can not only address multipath interference but also enable new applications such as recovering depth of near-transparent surfaces, looking through diffusers and creating time-profile movies of sweeping light. Our key idea is to formulate the forward amplitude modulated light propagation as a convolution with custom codes, record samples by introducing a simple sequence of electronic time delays, and perform sparse deconvolution to recover sequences of Diracs that correspond to multipath returns. Applications to computer vision include ranging of near-transparent objects and subsurface imaging through diffusers. Our low cost prototype may lead to new insights regarding forward and inverse problems in light transport.
|
520 |
|
|
|a United States. Defense Advanced Research Projects Agency (DARPA Young Faculty Award)
|
520 |
|
|
|a Alfred P. Sloan Foundation (Fellowship)
|
520 |
|
|
|a Massachusetts Institute of Technology. Media Laboratory. Camera Culture Group
|
546 |
|
|
|a en_US
|
655 |
7 |
|
|a Article
|
773 |
|
|
|t ACM Transactions on Graphics
|