COLLATION DEVICE AND COLLATION METHOD

• US 20200134343A1
• Filed: 05/30/2018
• Published: 04/30/2020
• Est. Priority Date: 07/20/2017
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: YAMAOKA, Megumi, MATSUKAWA, Takayuki
• Granted Patent: US 11,227,170 B2
• Time in Patent Office: Days
• CPC Class Codes: G06T 5/40 using histogram techniques
• CPC Class Codes: G06T 7/00 Image analysis
• CPC Class Codes: G06V 10/60 relating to illumination properties, e.g. using a reflectance or lighting model
• CPC Class Codes: G06V 40/168 Feature extraction; Face representation
• CPC Class Codes: G06V 40/171 Local features and components; Facial parts eye characteristics G06V40/18; Occluding parts, e.g. glasses; Geometrical relationships
• CPC Class Codes: G06V 40/172 Classification, e.g. identification
• CPC Class Codes: G06V 40/40 Spoof detection, e.g. liveness detection
• CPC Class Codes: H04N 23/611 where the recognised objects include parts of the human body
• CPC Class Codes: H04N 23/71 Circuitry for evaluating the brightness variation

Abstract

A collation device is configured to include a processor, and a storage unit that stores a predetermined determination condition in advance, under which a photographic image which is an image obtained by imaging a photograph of the subject is capable of being eliminated, the processor is configured to detect brightness distribution of a face image obtained by imaging an authenticated person with an imaging unit, determine whether or not the detected brightness distribution satisfies a determination condition, and perform face authentication using the face image satisfying the determination condition.

Claims

1. A collation device that collates a captured image obtained by imaging a subject by using an imaging device with a registered image of a registered subject which is registered in advance, the device comprising:

a processor; and

a storage unit that stores a predetermined determination condition in advance, under which a photographic image which is an image obtained by imaging a photograph of the subject is capable of being eliminated,

wherein the processor

detects a brightness distribution of the captured image,

determines whether or not the detected brightness distribution satisfies the determination condition, and

collates whether or not the subject in the captured image matches the registered subject in the registered image by using the captured image satisfying the determination condition.

2. The collation device of claim 1,

wherein the determination condition is a separation boundary capable of separating a real image that is an image obtained by imaging a real subject and the photographic image based on at least one of whether or not the captured image includes brightness that exceeds a predetermined upper limit boundary, and whether or not the captured image includes brightness that falls below a predetermined lower limit boundary.

3. The collation device of claim 2,

wherein the separation boundary is a boundary capable of separating a real image that is an image obtained by imaging a real subject and the photographic image based on at least one of a maximum value and a minimum value of the brightness of the captured image, and

wherein the processor

detects at least one of the maximum value and the minimum value of the brightness of the captured image, and

collates at least one of the detected maximum value or minimum value of the brightness with the separation boundary to determine whether the captured image is the real image or the photographic image.

4. The collation device of claim 3,

wherein the separation boundary is obtained by classifying a data group of at least one of the maximum value and the minimum value of the brightness of the photographic image and the real image into two classes using a two-class classifier.

5. The collation device of claim 1,

wherein the determination condition is a shape of a determination light beam irradiated to the subject when the captured image is acquired, and

wherein the processor

detects, from the captured image acquired by imaging the subject irradiated with the determination light beam, a highlight that is an area in which the brightness in the captured image exceeds a predetermined reference value, and

determines that the captured image is the photographic image in a case where the highlight is detected and the shape of the detected highlight corresponds to the shape of the determination light beam.

6. The collation device of claim 5,

wherein the determination light beam is a light beam having a horizontally long linear shape with a predetermined width.

7. The collation device of claim 5,

wherein the processor determines that the captured image is the real image in a case where an area of the detected highlight is smaller than a predetermined area.

8. The collation device of claim 1,

wherein the subject is a person'"'"'s face.

9. A collation method of collating a captured image obtained by imaging a subject by using an imaging device with a registered image of a registered subject which is registered in advance, the method comprising:

a step of storing a predetermined determination condition in advance, under which a photographic image which is an image obtained by imaging a photograph of the subject is capable of being eliminated;

a step of detecting a brightness distribution of the captured image;

a step of determining whether or not the detected brightness distribution satisfies the determination condition; and

a step of collating whether or not the subject in the captured image matches the registered subject in the registered image by using the captured image satisfying the determination condition.