ROTATIONAL PHASE UNWRAPPING
First Claim
1. A phase unwrapping method for image demodulation, the method comprising:
- receiving a plurality of images of a fringe pattern, the images being captured by rotating the fringe pattern by a predetermined rotation angle;
estimating a first wrapped phase value for a portion of a first image of the plurality of images and a second wrapped phase value for a corresponding portion of a second image of the plurality of images;
establishing a first plurality of elements associated with the first wrapped phase value;
for a candidate element from the first plurality of elements associated with the first wrapped phase value, determining a constraining element associated with the candidate element using the second wrapped phase value, wherein the association is established using the candidate element and the predetermined rotation angle; and
,unwrapping the phase for the portion of at least one of the first and second images using the candidate element based on the determined constraining element.
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Accused Products
Abstract
A phase unwrapping method for image demodulation comprises receiving a plurality of images of a fringe pattern captured by rotating the fringe pattern by a predetermined rotation angle. The method estimates a first wrapped phase value for a portion of a first image of the plurality of images and a second wrapped phase value for a corresponding portion of a second image, and establishes a first plurality of elements associated with the first wrapped phase value. For a candidate element from the first plurality of elements, the method determines a constraining element associated with the candidate element using the second wrapped phase value, where the association is established using the candidate element and the predetermined rotation angle, and unwraps the phase for the portion of at least one of the first and second images using the candidate element based on the determined constraining element.
12 Citations
22 Claims
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1. A phase unwrapping method for image demodulation, the method comprising:
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receiving a plurality of images of a fringe pattern, the images being captured by rotating the fringe pattern by a predetermined rotation angle; estimating a first wrapped phase value for a portion of a first image of the plurality of images and a second wrapped phase value for a corresponding portion of a second image of the plurality of images; establishing a first plurality of elements associated with the first wrapped phase value; for a candidate element from the first plurality of elements associated with the first wrapped phase value, determining a constraining element associated with the candidate element using the second wrapped phase value, wherein the association is established using the candidate element and the predetermined rotation angle; and
,unwrapping the phase for the portion of at least one of the first and second images using the candidate element based on the determined constraining element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for image demodulation by phase unwrapping, the method comprising:
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receiving a plurality of images of a fringe pattern, the images being captured by rotating the fringe pattern by a predetermined rotation angle; estimating a first wrapped phase value for a portion of a first image of the plurality of images and a second wrapped phase value for a corresponding portion of a second image of the plurality of images; establishing a first plurality of elements associated with the first wrapped phase value; rotating a candidate element from the first plurality of elements by the predetermined rotation angle to determine a constraining element associated with the second wrapped phase value; and unwrapping the phase for the portion of the first image using the candidate element based on the determined constraining element. - View Dependent Claims (19)
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20. A phase unwrapping method for image demodulation, the method comprising:
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receiving a plurality of images of a fringe pattern, the images being captured by rotating the fringe pattern by a predetermined rotation angle; estimating a first wrapped phase value for a portion of a first image of the plurality of images and a second wrapped phase value for a corresponding portion of a second image of the plurality of images; for a candidate element formed by applying an integer number of cycles to the first wrapped phase value, determining a constraining element associated with the candidate element using the second wrapped phase value, wherein the association is established using the candidate element and the predetermined rotation angle; and
,unwrapping the phase for the portion of at least one of the first and second images using the candidate element based on the determined constraining element.
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21. An X-ray Talbot interferometry system comprising:
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an imaging system for capturing a plurality of images of a fringe pattern formed by a plurality of gratings using the Talbot effect, the images being captured by rotating the fringe pattern by a predetermined rotation angle; and a processor system configured to demodulate the images using phase unwrapping, the processor system being operable to; estimate a first wrapped phase value for a portion of a first image of the plurality of images and a second wrapped phase value for a corresponding portion of a second image of the plurality of images; establish a first plurality of elements associated with the first wrapped phase value; for a candidate element from the first plurality of elements, determine a constraining element associated with the candidate element using the second wrapped phase value, wherein the association is established using the candidate element and the predetermined rotation angle; and unwrap the phase for the portion of the first image using the candidate element based on the determined constraining element.
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22. A depth estimation system comprising:
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a source for projecting a two-dimensional fringe pattern onto an object, the projecting including a plurality of rotations of the fringe pattern through a predetermined rotation angle; an imaging device for capturing a plurality of images of the fringe pattern on the object from the plurality of rotations; and a processor system configured to demodulate the images using phase unwrapping, the processor system being operable to; estimate a first wrapped phase value for a portion of a first image of the plurality of images and a second wrapped phase value for a corresponding portion of a second image of the plurality of images; establish a first plurality of elements associated with the first wrapped phase value; for a candidate element from the first plurality of elements, determine a constraining element associated with the candidate element using the second wrapped phase value, wherein the association is established using the candidate element and the predetermined rotation angle; unwrap the phase for the portion of the first image using the candidate element based on the determined constraining element; and estimate a depth of the object at the portion using the unwrapped phase for the portion.
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Specification