Reconstructing a Biometric Image
First Claim
1. A method for operating a biometric sensing device that includes a plurality of sensing elements, wherein the biometric sensing device is operatively connected to a processing channel that includes at least one variable gain amplifier, the method comprising:
- processing a section of a biometric image using a particular gain for each variable gain amplifier;
transmitting the section of the biometric image and at least one particular gain to a processing device; and
reconstructing signal levels on respective sensing elements associated with the section of the biometric image based on the at least one particular gain.
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Abstract
A biometric sensing device is operatively connected to a processing channel. The processing channel can include one or more variable gain amplifiers and/or one or more variable offset circuits. The signal levels associated with a section of a biometric image can be reconstructed using a digitized section of the biometric image and a particular gain and/or a particular offset value used in the processing channel to process the digitized section of the biometric image. The reconstructed sections of the biometric image can be combined to form a reconstructed biometric image. Additional processing operations can be performed on the reconstructed biometric image.
33 Citations
20 Claims
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1. A method for operating a biometric sensing device that includes a plurality of sensing elements, wherein the biometric sensing device is operatively connected to a processing channel that includes at least one variable gain amplifier, the method comprising:
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processing a section of a biometric image using a particular gain for each variable gain amplifier; transmitting the section of the biometric image and at least one particular gain to a processing device; and reconstructing signal levels on respective sensing elements associated with the section of the biometric image based on the at least one particular gain. - View Dependent Claims (2, 3, 4)
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5. A method for operating a biometric sensing device that includes a plurality of sensing elements, wherein the biometric sensing device is operatively connected to a processing channel that includes at least one variable offset circuit, the method comprising:
- capturing a section of a biometric image using a particular offset value output from variable offset circuit;
transmitting the section of the biometric image and at least one particular offset value to a processing device; and reconstructing signal levels on respective sensing elements associated with the section of the biometric image based on the at least one particular offset value. - View Dependent Claims (6)
- capturing a section of a biometric image using a particular offset value output from variable offset circuit;
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7. A system comprising:
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a biometric sensing device comprising a plurality of sensing elements; a processing channel operatively connected to the biometric sensing device, wherein the processing channel includes a variable gain amplifier; and a processing device operatively connected to an output of the processing channel, wherein the processing device receives a section of a biometric image and a gain of the variable gain amplifier and reconstructs signal levels on respective sensing elements associated with the section of the biometric image based on the at least one particular gain. - View Dependent Claims (12, 13, 14)
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- 10. The system as in claim 10, wherein the processing device comprises a secure processing device.
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15. A system comprising:
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a biometric sensing device comprising a plurality of sensing elements; a processing channel operatively connected to the biometric sensing device, wherein the processing channel includes a variable offset circuit; and a processing device operatively connected to an output of the processing channel, wherein the processing device receives a section of a biometric image and an offset value of the variable offset circuit and reconstructs signal levels on respective sensing elements associated with the section of the biometric image based on the offset value of the variable offset circuit. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification