Methods of biometric imaging of input surfaces
First Claim
1. An acoustic imaging system comprising:
- a distribution of acoustic transducers circumscribing a portion of a user input surface;
a controller coupled to each acoustic transducer of the distribution of acoustic transducers and configured to provide a drive signal to at least a first subset of acoustic transducers of the distribution of acoustic transducers and configured to obtain electrical signals from at least a second subset of acoustic transducers of the distribution of acoustic transducers; and
an image resolver coupled to the controller and configured to perform a back projection operation after receiving the electrical signals from the controller;
whereinthe second subset of acoustic transducers is diametrically opposite the first subset of acoustic transducers across the user input surface.
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Abstract
An acoustic imaging system includes multiple acoustic transducers disposed to circumscribe a portion of imaging surface. An acoustic imaging system also includes a controller and an image resolver. The acoustic transducers convert electrical signals into mechanical energy and/or mechanical energy into electrical signals. The controller is adapted to apply an electrical signal to the acoustic transducers which, in response, induce a mechanical wave, such as a surface wave, into the circumscribed portion. The controller is also adapted to receive electrical signals from the acoustic transducers. The image resolver uses the electrical signals received by the controller in order to construct an image of an object in physical contact with the imaging surface.
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Citations
20 Claims
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1. An acoustic imaging system comprising:
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a distribution of acoustic transducers circumscribing a portion of a user input surface; a controller coupled to each acoustic transducer of the distribution of acoustic transducers and configured to provide a drive signal to at least a first subset of acoustic transducers of the distribution of acoustic transducers and configured to obtain electrical signals from at least a second subset of acoustic transducers of the distribution of acoustic transducers; and an image resolver coupled to the controller and configured to perform a back projection operation after receiving the electrical signals from the controller;
whereinthe second subset of acoustic transducers is diametrically opposite the first subset of acoustic transducers across the user input surface. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An acoustic imaging system comprising:
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a user input surface comprising a substrate; a distribution of acoustic transducers circumscribing a portion of the substrate; a controller coupled to each acoustic transducer of the distribution of acoustic transducers and configured to; provide a drive signal to a first acoustic transducer of the distribution of acoustic transducers; and obtain electrical signals generated by a second acoustic transducer of the distribution of acoustic transducers, the second acoustic transducer diametrically opposite the first acoustic transducer across the substrate; and an image resolver coupled to the controller and configured to perform a back projection operation after receiving the electrical signals from the controller. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of imaging a surface of a substrate with an array of acoustic elements coupled to the substrate, the method comprising:
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determining a contact area of a touch provided to the surface with a touch input sensor; generating an acoustic pulse with a first acoustic element of the array of acoustic elements, the acoustic pulse configured to traverse the contact area at a selected angle; receiving electrical signals from a second acoustic element of the array of acoustic elements, the second acoustic element substantially opposite the substrate from the first acoustic element at the selected angle; performing a Radon transform of the contact area based, at least in part, on the selected angle and the received electrical signals; and resolving at least a portion of an image of the contact area based on the Radon transform. - View Dependent Claims (19, 20)
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Specification