The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 03, 2017
Filed:
Oct. 24, 2014
Achuta Kadambi, Cambridge, MA (US);
Refael Whyte, Hillcrest, NZ;
Ayush Bhandari, Cambridge, MA (US);
Lee Streeter, Hamilton, NZ;
Christopher Barsi, Exeter, NH (US);
Adrian Dorrington, Auckland, NZ;
Ramesh Raskar, Cambridge, MA (US);
Achuta Kadambi, Cambridge, MA (US);
Refael Whyte, Hillcrest, NZ;
Ayush Bhandari, Cambridge, MA (US);
Lee Streeter, Hamilton, NZ;
Christopher Barsi, Exeter, NH (US);
Adrian Dorrington, Auckland, NZ;
Ramesh Raskar, Cambridge, MA (US);
Massachusetts Institute of Technology, Cambridge, MA (US);
Abstract
In illustrative implementations, a time-of-flight camera robustly measures scene depths, despite multipath interference. The camera emits amplitude modulated light. An FPGA sends at least two electrical signals, the first being to control modulation of radiant power of a light source and the second being a reference signal to control modulation of pixel gain in a light sensor. These signals are identical, except for time delays. These signals comprise binary codes that are m-sequences or other broadband codes. The correlation waveform is not sinusoidal. During measurements, only one fundamental modulation frequency is used. One or more computer processors solve a linear system by deconvolution, in order to recover an environmental function. Sparse deconvolution is used if the scene has only a few objects at a finite depth. Another algorithm, such as Wiener deconvolution, is used is the scene has global illumination or a scattering media.