Biometric information processing device, biometric-information processing method, and computer-readable storage medium
First Claim
1. A biometric-information processing device comprising:
- a processor; and
a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute,generating a biometric image representing biometric information on a surface of a specific portion of a user;
dividing the biometric image into multiple blocks;
estimating, for each of the multiple blocks, a prior complexity degree indicating complexity of a pattern of part included in the biometric information and represented in the block, on a basis of a difference between a direction of the pattern of the part included in the biometric information and represented in the block and a direction of a pattern of other part included in the biometric information and represented in the block adjacent to that block;
determining, for each of the multiple blocks, a posterior complexity degree indicating complexity of an image of the part included in the biometric information and represented in the block, on a basis of features indicating a complexity degree of an image represented in the block; and
detecting the block having a difference between the posterior complexity degree and the prior complexity degree as a distorted block in which the part included in the biometric information and represented in the block has distortion, by comparing the posterior complexity degree with the prior complexity degree for each of the multiple blocks.
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Accused Products
Abstract
An biometric-information processing device includes a biometric-information acquiring unit that generates a biometric image representing biometric information on a surface of a specific portion of a user; a divider that divides the biometric image into multiple blocks; a prior-complexity-degree estimator that estimates, for each of the multiple blocks, a prior complexity degree indicating complexity of a pattern of part included in the biometric information and represented in the block, on a basis of a difference between a direction of the pattern of the part included in the biometric information and represented in the block and a direction of a pattern of other part included in the biometric information and represented in the block adjacent to that block; a posterity-complexity-degree determiner that determines, for each of the multiple blocks, a posterior complexity degree indicating complexity of an image of the part included in the biometric information and represented in the block.
10 Citations
15 Claims
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1. A biometric-information processing device comprising:
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a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute, generating a biometric image representing biometric information on a surface of a specific portion of a user; dividing the biometric image into multiple blocks; estimating, for each of the multiple blocks, a prior complexity degree indicating complexity of a pattern of part included in the biometric information and represented in the block, on a basis of a difference between a direction of the pattern of the part included in the biometric information and represented in the block and a direction of a pattern of other part included in the biometric information and represented in the block adjacent to that block; determining, for each of the multiple blocks, a posterior complexity degree indicating complexity of an image of the part included in the biometric information and represented in the block, on a basis of features indicating a complexity degree of an image represented in the block; and detecting the block having a difference between the posterior complexity degree and the prior complexity degree as a distorted block in which the part included in the biometric information and represented in the block has distortion, by comparing the posterior complexity degree with the prior complexity degree for each of the multiple blocks. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A biometric-information processing method comprising:
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generating a biometric image representing biometric information on a surface of a specific portion of a user; dividing the biometric image into multiple blocks; estimating, for each of the multiple blocks, a prior complexity degree indicating complexity of a pattern of part included in the biometric information and represented in the block, on a basis of a difference between a direction of the pattern of the part included in the biometric information and represented in the block and a direction of a pattern of other part included in the biometric information and represented in the block adjacent to that block; determining, for each of the multiple blocks, a posterior complexity degree indicating complexity of an image of the part included in the biometric information and represented in the block, on a basis of features indicating a complexity degree of an image represented in the block; and detecting the block having a difference between the posterior complexity degree and the prior complexity degree as a distorted block in which the part included in the biometric information and represented in the block has distortion, by comparing the posterior complexity degree with the prior complexity degree for each of the multiple blocks. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A non-transitory computer-readable storage medium storing a biometric-information processing program that causes a computer to execute a process comprising:
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dividing a biometric image representing biometric information on a surface of a specific portion of a user into multiple blocks; estimating, for each of the multiple blocks, a prior complexity degree indicating complexity of a pattern of part included in the biometric information and represented in the block, on a basis of a difference between a direction of the pattern of the part included in the biometric information and represented in the block and a direction of a pattern of other part included in the biometric information and represented in the block adjacent to that block; determining, for each of the multiple blocks, a posterior complexity degree indicating complexity of an image of the part included in the biometric information and represented in the block, on a basis of features indicating a complexity degree of an image represented in the block; and detecting the block having a difference between the posterior complexity degree and the prior complexity degree as a distorted block in which the part included in the biometric information and represented in the block has distortion, by comparing the posterior complexity degree with the prior complexity degree for each of the multiple blocks. - View Dependent Claims (14, 15)
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Specification