Patent ID: 8824746

Claim:
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.