Methods and apparatus for imaging of occluded objects

Patent metadata

Field	Value
Publication number	US-9274047-B2
Application number	US-201414287811-A
Country	US
Kind code	B2
Filing date	May 27, 2014
Priority date	May 24, 2013
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

An active imaging system, which includes a light source and light sensor, generates structured illumination. The light sensor captures transient light response data regarding reflections of light emitted by the light source. The transient light response data is wavelength-resolved. One or more processors process the transient light response data and data regarding the structured illumination to calculate a reflectance spectra map of an occluded surface. The processors also compute a 3D geometry of the occluded surface.

First claim

What is claimed is:

1. A method comprising, in combination:
(a) using an active imaging system to generate structured illumination, which active imaging system includes a light sensor and a light source;
(b) using the light sensor to capture transient light response data regarding reflections of light that is emitted by the light source and reflected from an occluded surface; and
(c) using one or more processors to process the transient light response data and data regarding the structured illumination to calculate a reflectance spectra map of the occluded surface;
wherein the light source is wavelength-resolved and wavelength-tunable.

2. A method comprising, in combination:
(a) using an active imaging system to generate structured illumination, which active imaging system includes a light sensor and a light source;
(b) using the light sensor to capture transient light response data regarding reflections of light that is emitted by the light source and reflected from an occluded surface; and
(c) using one or more processors to process the transient light response data and data regarding the structured illumination to calculate a reflectance spectra map of the occluded surface;
wherein the light source emits a series of pulses of light, such that:
(i) the light source emits a first wavelength during a first set of the pulses of light and not during other pulses in the series;
(ii) the light source emits a second wavelength during a second set of the pulses of light and not during other pulses in the series; and
(iii) the light source emits a third wavelength during a third set of the pulses of light and not during other pulses in the series; and
(iv) the first, second and third sets of pulses of light do not overlap each other.

3. A method comprising, in combination:
(a) using an active imaging system to generate structured illumination, which active imaging system includes a light sensor and a light source;
(b) using the light sensor to capture transient light response data regarding reflections of light that is emitted by the light source and reflected from an occluded surface; and
(c) using one or more processors to process the transient light response data and data regarding the structured illumination to calculate a reflectance spectra map of the occluded surface;
wherein the light sensor is wavelength-resolved and wavelength-tunable.

4. A method comprising, in combination:
(a) using an active imaging system to generate structured illumination, which active imaging system includes a light sensor and a light source;
(b) using the light sensor to capture transient light response data regarding reflections of light that is emitted by the light source and reflected from an occluded surface; and
(c) using one or more processors to process the transient light response data and data regarding the structured illumination to calculate a reflectance spectra map of the occluded surface;
wherein:
(i) the light sensor is wavelength-resolved and wavelength-tunable; and
(ii) the light source is wavelength-resolved and wavelength-tunable.

Assignees

• Velten Andreas
• Raskar Ramesh
• Massachusetts Inst Technology

Inventors

• Velten Andreas
• Raskar Ramesh

Classifications

• G01N21/255

  Details, e.g. use of specially adapted sources, lighting or optical systems · CPC title

• G01N21/27 Primary

  using photo-electric detection (G01N21/31 takes precedence){; circuits for computing concentration (logarithmic circuits G06G7/24; photometric circuits in general G01J)} · CPC title

• G01J3/021

  using plane or convex mirrors, parallel phase plates, or particular reflectors · CPC title

• G01J3/027

  Control of working procedures of a spectrometer; Failure detection; Bandwidth calculation · CPC title

• G01N2021/6417

  Spectrofluorimetric devices · CPC title