APPARATUS AND METHOD FOR IDENTIFYING FAKE FACE

• US 20130223681A1
• Filed: 02/21/2013
• Published: 08/29/2013
• Est. Priority Date: 02/29/2012
• Status: Active Grant

• Current Assignee: Suprema Incorporated
• Original Assignee: Suprema Incorporated
• Inventors: LEE, KI DEOK, PARK, BO GUN, SHIN, HO CHUL, SONG, BONG SEOP, LEE, JAE WON
• Granted Patent: US 9,245,173 B2
• Time in Patent Office: Days
• US Class Current: 382/103
• 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 40/18 Eye characteristics, e.g. of the iris
• CPC Class Codes: G06V 40/40 Spoof detection, e.g. liveness detection

Abstract

An apparatus for identifying a fake face is provided. A first eye image acquirer acquires a first eye image by taking a picture of a subject while radiating a first ray having a first wavelength. A second eye image acquirer acquires a second eye image by taking a picture of the subject while radiating a second ray having a second wavelength that is shorter than the first wavelength. A controller extracts a first area and a second area having brighter lightness than the first area from each of the first and second eye images, calculates a lightness of the first area and a lightness of the second area in the first eye image, and a lightness of the first area and a lightness of the second area in the second eye image, and determines whether the subject uses a fake face based on the calculated lightness.

Claims

1. An apparatus for identifying a fake face, the apparatus comprising:

a first eye image acquirer configured to acquire a first eye image by taking a picture of a subject while radiating a first ray having a first wavelength;

a second eye image acquirer configured to acquire a second eye image by taking a picture of the subject while radiating a second ray having a second wavelength that is shorter than the first wavelength; and

a controller configured to extract a first area and a second area having brighter lightness than the first area from each of the first eye image and the second eye image, to calculate a first lightness of the first area and a second lightness of the second area in the first eye image, and a third lightness of the first area and a fourth lightness of the second area in the second eye image, and to determine whether the subject uses a fake face based on the first lightness, the second lightness, the third lightness, and the fourth lightness.

2. The apparatus of claim 1, wherein the first ray includes an infrared ray, and the second ray includes a visible ray.

3. The apparatus of claim 1, wherein the first area includes an iris area, and the second area includes a sclera area.

4. The apparatus of claim 1, wherein the controller is further configured to determine that the subject uses the fake face when a difference between the first lightness and the second lightness is equal or greater than a difference between the third lightness and the fourth lightness, and to determine that the subject uses a real face when the difference between the first lightness and the second lightness is less than the difference between the third lightness and the fourth lightness.

5. The apparatus of claim 1, wherein the controller is further configured to determine that the subject uses the fake face when the first lightness is equal to or lower than the third lightness and/or the second lightness is equal to or higher than the fourth lightness, and determine that the subject uses a real face when the first lightness is higher than the third lightness and/or the second lightness is lower than the fourth lightness.

6. The apparatus of claim 1, wherein the controller is further configured to convert a difference between the first lightness and the second lightness to a first spatial frequency and a difference between the third lightness and the fourth lightness to a second spatial frequency, and to determine whether the subject uses the fake face by using the first spatial frequency and the second spatial frequency.

7. The apparatus of claim 6, wherein the controller is further configured to determine the subject uses the fake face when amplitude of a high frequency component for the first spatial frequency is equal to or greater than amplitude of a high frequency component for the second spatial frequency, and to determine the subject uses a real face when the amplitude of the high frequency component for the first spatial frequency is less than the amplitude of the high frequency component for the second spatial frequency.

8. The apparatus of claim 1, wherein the fake face includes any one of an artificial eye, an eye image on a photo, an eye image on a printed page, an eye of a mannequin, or an eye image played by a video.

9. The apparatus of claim 1, further comprising a storage configured to store the first lightness, the second lightness, the third lightness, the fourth lightness, and a determining result of the controller.

10. A method of identifying a fake face by a fake face identification apparatus, the method comprising:

acquiring a first eye image by taking a picture of a subject while radiating a first ray having a first wavelength;

acquiring a second eye image by taking a picture of the subject while radiating a second ray having a second wavelength that is shorter than the first wavelength;

extracting a first area and a second area having brighter lightness than the first area from each of the first eye image and the second eye image;

calculating a first lightness of the first area and a second lightness of the second area in the first eye image, and a third lightness of the first area and a fourth lightness of the second area in the second eye image; and

determining whether the subject uses a fake face based on the first lightness, the second lightness, the third lightness, and the fourth lightness.

11. The method of claim 10, wherein the first ray includes an infrared ray, and the second ray includes a visible ray.

12. The method of claim 10, wherein the first area includes an iris area, and the second area includes a sclera area.

13. The method of claim 10, wherein determining whether the subject uses the fake face includes:

determining that the subject uses the fake face when a difference between the first lightness and the second lightness is equal or greater than a difference between the third lightness and the fourth lightness; and

determining that the subject uses a real face when the difference between the first lightness and the second lightness is less than the difference between the third lightness and the fourth lightness.

14. The method of claim 10, wherein determining whether the subject uses the fake face includes:

determining that the subject uses the fake face when the first lightness is equal to or lower than the third lightness and/or the second lightness is equal to or higher than the fourth lightness; and

determining that the subject uses a real face when the first lightness is higher than the third lightness and/or the second lightness is lower than the fourth lightness.

15. The method of claim 10, further comprising converting a difference between the first lightness and the second lightness to a first spatial frequency and a difference between the third lightness and the fourth lightness to a second spatial frequency, and

wherein determining whether the subject uses the fake face includes determining whether the subject uses the fake face by using the first spatial frequency and the second spatial frequency.

16. The method of claim 15, wherein determining whether the subject uses the fake face further includes:

determining the subject uses the fake face when amplitude of a high frequency component for the first spatial frequency is equal to or higher than amplitude of a high frequency component for the second spatial frequency; and

determining the subject uses a real face when the amplitude of the high frequency component for the first spatial frequency is less than the amplitude of the high frequency component for the second spatial frequency.

17. The method of claim 10, wherein the fake face includes any one of an artificial eye, an eye image on a photo, an eye image on a printed page, an eye of a mannequin, or an eye image played by a video.

18. The method of claim 10, further comprising storing the first lightness, the second lightness, the third lightness, the fourth lightness, and a determining result of the controller.