Dermal image information processing device, dermal image information processing method, and program

1. A dermal fingerprint image information processing device comprising:

at least one memory storing instructions; and

at least one processor configured to execute the instructions to:

acquire image information indicating an image of a papillary layer of a finger;

detect a directional singular point of a dermal ridge line from the image of the papillary layer; and

detect a singular region indicating damage of the papillary layer of the finger, by determining whether a detection result of the directional singular point satisfies a condition of any of an arch-shaped pattern, a loop-shaped pattern, a spiral-shape pattern, and a variant-shaped pattern.

2. The dermal fingerprint image information processing device according to claim 1 ,

wherein the at least one processor is configured to execute the instructions to:

acquire dermal ridge line direction information corresponding to a portion included in the image of the papillary layer;

find an evaluation value for each dermal ridge line direction information, based on a correlation between each dermal ridge line direction information, and a template of an abnormal dermal ridge line direction that is preliminary held, the evaluation value indicating a degree of possession of an abnormal dermal ridge line direction pattern; and

detect a portion corresponding to dermal ridge line direction information for which the evaluation value is equal to or greater than a predetermined threshold value, as the singular region.

3. The dermal fingerprint image information processing device according to claim 1 ,

wherein the at least one processor is configured to execute the instructions to:

acquire dermal ridge line direction information corresponding to a portion included in the image of the papillary layer;

obtain smoothed dermal ridge line direction information by performing direction smoothing processing for each dermal ridge line direction information, based on dermal ridge line direction information corresponding to a region located around a region corresponding to the dermal ridge line direction information; and

detect a region corresponding to the dermal ridge line direction information in, which a difference between the dermal ridge line direction information and the smoothed dermal ridge line direction information is greater than a predetermined threshold value, as the singular region.

4. The dermal fingerprint image information processing device according to claim 1 ,

wherein the at least one processor is configured to execute the instructions to:

acquire dermal ridge line direction information and dermal ridge line pitch information corresponding to a region included in the image of the papillary layer;

find an evaluation value based on the dermal ridge line direction information and the dermal ridge line pitch information, the evaluation value taking a greater value as a difference in dermal ridge line directions and a difference in dermal ridge line pitches become greater between adjacent regions in the image of the papillary layer; and

in a case where the evaluation value is greater than a predetermined threshold value, detect that the adjacent regions are a singular region due to cutout work.

5. The dermal fingerprint image information processing device according to claim 1 ,

wherein the at least one processor is configured to execute the instructions to:

collate dermal image information corresponding to a region other than the detected singular region among the acquired dermal image information, and image information of the papillary layer registered in advance in association with identifying information for identifying an individual.

6. The dermal fingerprint image information processing device according to claim 5 , wherein the at least one processor is configured to execute the instructions to:

when performing the collation processing, make at least either one of a positional deviation allowance and a mismatch allowance variable, the positional deviation allowance representing a degree to which positional deviation is allowed, and the mismatch allowance representing a degree to which a mismatch is allowed.

7. The dermal fingerprint image information processing device according to claim 5 ,

wherein the at least one processor is configured to execute the instructions to:

repair damage of the dermal image information corresponding to the singular region in the obtained dermal image information; and

regard a region corresponding to the repaired dermal image information as the region other than the singular region, and perform the collation.

8. The dermal fingerprint image information processing device according to claim 7 , wherein the at least one processor is configured to execute the instructions to:

exclude an exclusion region defined based on, the singular region, from the image of the papillary layer, to thereby repair the damage.

9. The dermal fingerprint image information processing device according to claim 7 ,

wherein the at least one processor is configured to execute the instructions to:

find an evaluation value for each portion included in the image of the papillary layer, based on a correlation between dermal ridge line direction information and a template of an abnormal dermal ridge line direction pattern that is preliminary held, the evaluation value representing a degree to which the dermal ridge line direction information has an abnormal dermal ridge line directional pattern;

extract a straight line component of the evaluation value in the image of the papillary layer; and

repair the damage by mutually replacing images of the papillary layer included in a first polygon and a second polygon defined based on, the extracted straight line components.

10. A dermal fingerprint image information processing method executed by a computer, the method comprising:

acquire image information indicating an image of a papillary layer of a finger;

detect a directional singular point of a dermal ridge line from the image of the papillary layer; and

detecting a singular region indicating damage of the papillary layer of the finger, by determining whether a detection result of the directional singular point satisfies a condition of any of an arch-shaped pattern, a loop-shaped pattern, a spiral-shaped pattern, and a variant-shaped pattern.

11. A non-transitory computer-readable recording medium storing a computer-executable program, the program comprising:

instructions for acquiring image information indicating an image of a papillary layer of a finger;

instructions for detecting a directional singular point of a dermal ridge line from the image of the papillary layer; and

instructions for detecting a singular region indicating damage of the papillary layer of the finger, by determining whether a detection result of the directional singular point satisfies a condition of any of an arch-shaped pattern, a loop-shaped pattern, a spiral-shaped pattern, and a variant-shaped pattern.