Method and apparatus for quantitative 3-D imaging

• US 8,576,381 B2
• Filed: 01/22/2008
• Issued: 11/05/2013
• Est. Priority Date: 01/22/2007
• Status: Active Grant

• Current Assignee: California Institute of Technology
• Original Assignee: California Institute of Technology
• Inventors: Gharib, Morteza, Graff, Emilio, Pereira, Francisco
• Primary Examiner(s): RATCLIFFE, LUKE D
• Application Number:
  US12/011,016
• Publication Number:
  US 20080278804A1
• Time in Patent Office: 2,114 Days
• Field of Search: 356 301- 285
• US Class Current: 356/4.01
• CPC Class Codes: G01B 11/24 for measuring contours or curvatures
• CPC Class Codes: G01B 11/2509 Color coding
• CPC Class Codes: H04N 13/204 using stereoscopic image cameras stereoscopic photography G03B35/00
• CPC Class Codes: H04N 25/00 Circuitry of solid-state image sensors [SSIS]; Control thereof

Abstract

Described is a method and apparatus for obtaining additional information from an object and a method for surface imaging and three-dimensional imaging. Single lens, single aperture, single sensor system and stereo optic systems may be modified in order to successfully generate surface maps of objects or three-dimensional representations of target objects. A variety of the aspects of the present invention provide examples of the use of an addressable pattern in order to overcome mismatching common to standard defocusing techniques.

Claims

1. A method for constructing a representation of a surface of a target object by using an addressable pattern, comprising acts of:

acquiring a plurality of images of an addressable pattern from different viewpoints through an imaging lens and a mask having at least one set of off-axis apertures, each of the plurality of images comprising addressable pattern information and at least one point representing at least one aspect of a target object, wherein the at least one set of off-axis apertures filters light reflected from the surface of the target object into the plurality of images;

processing the plurality of images to assign an address to each point in each of the plurality of images;

developing an addressed list of points using the address of each point in each of the plurality of images;

returning the addressed list of points to an imaging system processor for conversion into a three-dimensional measurement; and

causing the imaging system processor to generate a representation of a surface of a target object based on the three-dimensional measurement.

2. The method of claim 1, further comprising an act of projecting the addressable pattern image onto the surface of the target object to generate a plurality of images of an addressable pattern.

3. The method of claim 2, wherein in the act of projecting the addressable pattern image onto the surface of the target object, the projected addressable pattern image is a pattern selected from a group consisting of a color sequence pattern and a shape sequence pattern.

4. The method of claim 2, wherein in the act of projecting the addressable pattern image onto the surface of the target object, the projected addressable pattern image is a position sequence pattern.

5. The method of claim 1, further comprising an act of physically placing an addressable pattern image onto the surface of the target object.

6. The method of claim 5, wherein in the act of projecting the addressable pattern image onto the surface of the target object, the projected addressable pattern image is a pattern selected from a group consisting of a color sequence pattern and a shape sequence pattern.

7. The method of claim 5, wherein in the act of projecting the addressable pattern image onto the surface of the target object, the projected addressable pattern image is a position sequence pattern.

8. The method of claim 1, further comprising an act of providing a target object such that the addressable pattern is inherent in the target object being imaged.

9. The method of claim 1, further comprising calculating distance information between corresponding points in each of the plurality of images.

10. The method of claim 9, wherein the distance information is in relation to a focal length.