Depth-varying light fields for three dimensional sensing
First Claim
Patent Images
1. A method for imaging, comprising:
- defining a first optical constraint such that application of the first optical constraint to a beam of light splits the beam into a pattern of multiple spots;
defining a second optical constraint such that application of the second optical constraint to the beam of light causes the beam to form a spot having a shape characteristic that changes in a predefined manner as a function of a distance along an axis of the beam;
designing a first filter to implement the first optical constraint and a second filter, different from the first filter, to implement the second optical constraint;
creating at least one optical element as a superposition of the first and second filters; and
directing a beam of light through the at least one optical element so as to project the pattern onto a surface such that the multiple spots in the pattern have the shape characteristic.
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Abstract
A method for mapping includes projecting onto an object a pattern of multiple spots having respective positions and shapes, such that the positions of the spots in the pattern are uncorrelated, while the shapes share a common characteristic. An image of the spots on the object is captured and processed so as to derive a three-dimensional (3D) map of the object.
179 Citations
36 Claims
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1. A method for imaging, comprising:
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defining a first optical constraint such that application of the first optical constraint to a beam of light splits the beam into a pattern of multiple spots; defining a second optical constraint such that application of the second optical constraint to the beam of light causes the beam to form a spot having a shape characteristic that changes in a predefined manner as a function of a distance along an axis of the beam; designing a first filter to implement the first optical constraint and a second filter, different from the first filter, to implement the second optical constraint; creating at least one optical element as a superposition of the first and second filters; and directing a beam of light through the at least one optical element so as to project the pattern onto a surface such that the multiple spots in the pattern have the shape characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Apparatus for imaging, comprising:
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at least one optical element, which is designed as a superposition of different, first and second filters, which respectively implement first and second optical constraints, such that application of the first optical constraint to a beam of light splits the beam into a pattern of multiple spots, and application of the second optical constraint to the beam of light causes the beam to form a spot having a shape characteristic that changes in a predefined manner as a function of a distance along an axis of the beam; and a light source, which is configured to direct a beam of light through the at least one optical element so as to project the pattern onto a surface such that the multiple spots in the pattern have the shape characteristic. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for imaging, comprising:
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defining a target pattern of multiple spots as a convolution of at least first and second patterns of different types; superposing at least first and second filters, which are designed to create the first and second patterns, respectively; and directing a beam of light through the superposed filters so as to project the target pattern onto a surface. - View Dependent Claims (28, 29, 30, 31)
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32. Apparatus for imaging, comprising:
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a first filter and a second filter, which are together configured to create, by superposition of the first and second filters, a target pattern of multiple spots, which is a convolution of a first pattern created by the first filter and a second pattern, of a different type from the first pattern, created by the second filter; and a light source, which is configured to direct a beam of light through the first and second filters in superposition so as to project the target pattern onto a surface. - View Dependent Claims (33, 34, 35, 36)
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Specification