Face authentication device having database with small storage capacity
Face authentication can easily be performed based on an input image including a mirror region reflected by a mirror without increasing a storage capacity of a database. With the database, for each face of a person to be authenticated, only one real front image is to be registered as a reference face image. A mirror image processing circuitry detects the mirror region from the input image and to subject a detected mirror region to lateral inversion processing to produce a processed image. A face detection processing circuitry detects a face image from the processed image to generate a detected face image. A face authentication processing circuitry compares the detected face image with the reference face image, to thereby perform face authentication.
1. A face authentication device, which is configured to perform face authentication of any person present in a narrow floor or passage based on an input image picked up by an image pickup device, the input image including a mirror region reflected by a mirror installed in the narrow floor or passage,
the face authentication device comprising:
a database with which, for each face of a person to be authenticated, only one real front image is to be registered as a reference face image;
a mirror image processing circuitry configured to detect the mirror region from the input image and to subject a detected mirror region to lateral inversion processing to produce a processed image;
a face detection processing circuitry configured to detect a face image from the processed image to generate a detected face image; and
a face authentication processing circuitry configured to compare the detected face image with the reference face image, to thereby perform face authentication,
wherein the image pick up device is positioned at a higher location than the person to be authenticated,
wherein the image pick up device is focused in a downward direction to pick up the input image including the mirror region reflected by the mirror,
wherein the mirror is located closer to the image pickup device than the person to be authenticated and is installed in the vicinity of a ceiling,
wherein the mirror is located between the image pickup device and the person to be authenticated,
wherein a direct distance between the image pickup device and the person to be authenticated is longer than a direct distance between the image pickup device and the mirror, and
wherein an image pickup range of the image pickup device is limited to the mirror.
2. The face authentication device according to claim 1 , wherein the mirror image processing circuitry includes a mirror region decision circuitry configured to decide the mirror region from the input image.
3. The face authentication device according to claim 2 ,
wherein the mirror has a mirror frame mounted thereto in advance, and
wherein the mirror region decision circuitry includes:
a storage configured to store a feature of the mirror frame as a stored feature; and
a mirror frame detection circuitry configured to detect the mirror region from the input image based on the stored feature.
4. The face authentication device according to claim 2 ,
wherein the mirror has attached thereto a cut film configured to avoid reflecting a specific wavelength, and
wherein the mirror region decision circuitry includes a wavelength detection circuitry configured to detect from the input image, as the mirror region, a portion in which light having the specific wavelength is inhibited from being reflected.
5. The face authentication device according to claim 1 , wherein the mirror image processing circuitry further includes a distortion correction circuitry configured to correct distortion of the mirror region.
6. The face authentication device according to claim 1 , wherein image pick up device is positioned in the vicinity of a ceiling.
7. A face authentication method for performing face authentication of any person present in a narrow floor or passage based on an input image including a mirror region reflected by a mirror installed in the narrow floor or passage,
the face authentication method comprising:
registering, for each face of a person to be authenticated, only one real front image with a database as a reference face image;
subjecting the mirror region of the input image to lateral inversion processing to produce a processed image;
detecting a face region from the processed image to generate a detected face image; and
comparing the detected face image with the reference face image, to thereby perform face authentication,
wherein an image pick up device is positioned at a higher location than the person to be authenticated,
wherein the image pick up device is focused in a downward direction to pick up the input image including the mirror region reflected by the mirror,
wherein the mirror is located closer to the image pickup device than the person to be authenticated and is installed in the vicinity of a ceiling,
wherein the mirror is located between the image pickup device and the person to be authenticated,
wherein a direct distance between the image pickup device and the person to be authenticated is longer than a direct distance between the image pickup device and the mirror, and
wherein an image pickup range of the image pickup device is limited to the mirror.
8. The face authentication method according to claim 7 , wherein the subjecting the mirror region of the input image to lateral inversion processing includes deciding the mirror region from the input image.
9. The face authentication method according to claim 7 , wherein the subjecting the mirror region of the input image to lateral inversion processing further includes correcting distortion of the mirror region.
10. The face authentication method according to claim 7 , wherein image pick up device is positioned in the vicinity of a ceiling.
11. A non-transitory computer readable recording medium storing a face authentication program for causing a computer to execute face authentication of any person present in a narrow floor or passage based on an input image including a mirror region reflected by a mirror installed in the narrow floor or passage, the face authentication program causing the computer to execute:
a registration procedure of registering, for each face of a person to be authenticated, only one real front image with a database as a reference face image;
a mirror image processing procedure of subjecting the mirror region of the input image to lateral inversion processing to produce a processed image;
a face detection processing procedure of detecting a face region from the processed image to generate a detected face image; and
a face authentication processing procedure of comparing the detected face image with the reference face image, to thereby perform face authentication,
wherein an image pick up device is positioned at a higher location than the person to be authenticated,
wherein the image pick up device is focused in a downward direction to pick up the input image including the mirror region reflected by the mirror,
wherein the mirror is located closer to the image pickup device than the person to be authenticated and is installed in the vicinity of a ceiling,
wherein the mirror is located between the image pickup device and the person to be authenticated,
wherein a direct distance between the image pickup device and the person to be authenticated is longer than a direct distance between the image pickup device and the mirror, and
wherein an image pickup range of the image pickup device is limited to the mirror.
12. The non-transitory computer readable recording medium according to claim 11 , wherein the mirror image processing procedure includes a mirror region decision procedure of causing the computer to decide the mirror region from the input image.
13. The non-transitory computer readable recording medium according to claim 11 , wherein image pick up device is positioned in the vicinity of a ceiling.