System and method for three-dimensional imaging of opaque objects using frequency diversity and an opacity constraint
First Claim
1. A system for determining an image of an opaque object, the system comprising:
- a source of coherent radiation for illuminating the opaque object at a plurality of frequencies to create a corresponding plurality of speckle patterns;
a detector for performing intensity detection of scattered radiation forming the speckle patterns at each of the plurality of frequencies;
a computer in communication with the detector for storing a representation of the detected intensities and executing logic to determine an estimate of the object based on the stored representation and knowledge that the object is opaque such that the representation is confined to a two-dimensional surface embedded in a three-dimensional space.
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Abstract
A system and method for creating a three-dimensional image of an opaque object utilize frequency diverse coherent illumination in combination with an opacity constraint in performing three-dimensional phase retrieval and/or profile retrieval. An opaque object is one which exhibits only surface scattering and no volume scattering over volumes that extend beyond the desired range resolution. The system and method require only Fourier intensity information to create a three-dimensional image which avoids the difficulties associated with prior art systems and methods requiring phase information to produce similar images. Furthermore, the system and method of the present invention do not require imaging optics, precise alignment of optical components, or precise phase stability of the coherent illumination source.
28 Citations
25 Claims
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1. A system for determining an image of an opaque object, the system comprising:
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a source of coherent radiation for illuminating the opaque object at a plurality of frequencies to create a corresponding plurality of speckle patterns; a detector for performing intensity detection of scattered radiation forming the speckle patterns at each of the plurality of frequencies; a computer in communication with the detector for storing a representation of the detected intensities and executing logic to determine an estimate of the object based on the stored representation and knowledge that the object is opaque such that the representation is confined to a two-dimensional surface embedded in a three-dimensional space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for determining a three-dimensional image of an opaque object, the method comprising:
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illuminating the opaque object with coherent radiation at a plurality of frequencies; at each of the plurality of frequencies, detecting intensity information representing radiation scattered from the object forming a corresponding plurality of speckle patterns; storing the detected intensity information; and estimating an image of the opaque object based on the stored intensity information and knowledge that the object is opaque such that the intensity information is confined to a two-dimensional surface embedded in a three-dimensional space. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification