[논문]A Privacy-protection Device Using a Directional Backlight and Facial Recognition

Lee, Hyeontaek; Kim, Hyunsoo; Choi, Hee-Jin

doi:10.3807/copp.2020.4.5.421

A Privacy-protection Device Using a Directional Backlight and Facial Recognition 원문보기

Current optics and photonics, v.4 no.5, 2020년, pp.421 - 427

Lee, Hyeontaek (Department of Physics and Astronomy, Sejong University) , Kim, Hyunsoo (Department of Physics and Astronomy, Sejong University) , Choi, Hee-Jin (Department of Physics and Astronomy, Sejong University)

Abstract ▼ AI-Helper

A novel privacy-protection device to prevent visual hacking is realized by using a directional backlight and facial recognition. The proposed method is able to overcome the limitations of previous privacy-protection methods that simply restrict the viewing angle to a narrow range. The accuracy of user tracking is accomplished by the combination of a time-of-flight sensor and facial recognition with no restriction of detection range. In addition, an experimental demonstration is provided to verify the proposed scheme.

주제어

표/그림 (11)

그림 FIG. 2. Retrieving the depth z of the face's center without the output from the TOF sensor.
그림 FIG. 1. Calculation of the true position of the face's center.
그림 FIG. 3. Structure and principle of the directional backlight system.
그림 FIG. 4. Effect of the width of the line light source on the imperfect collimation.
그림 FIG. 5. Principles of the proposed privacy-protection system.
그림 FIG. 6. Calculation of line light source positions.
그림 FIG. 7. Analysis of the viewing zone and viewing angle of the proposed method.
그림 FIG. 8. Pictures of the experimental setup and face cameras, with registered and unregistered faces.
그림 FIG. 9. Positions of the face cameras to capture the observed views.
그림 FIG. 10. Experimental results when the face camera is within the detection range of the TOF sensor. The blue solid and green dashed lines represent the locations of the registered and unregistered observers respectively.
그림 FIG. 11. Experimental results when the face camera is closer than the detection range of the TOF sensor. The blue solid and green dashed lines represent the locations of the registered and unregistered observers respectively.

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가설 설정

25 mm, we attach a convex-lens array composed of 13 by 13 elemental lenses, each with pitch p_el of 10 mm and focal length f_LA of 22 mm, as shown in Fig. 9. The line light source behind the lens array has a width of 0.162 mm. From those parameters, we expect that the proposed system can provide privacy protection within a viewing angle θ_max of about 17° when the observer is located 800 mm from the device.

제안 방법

As a first step of verification, we locate two face cameras with registered and unregistered faces 800 mm from the LCD panel, and check whether the system provides the screen information only to the location of the registered face. The experimental results are shown in Fig.
Though various kinds of securing technology are developed in transmitting the information, the display screen is still vulnerable to simple peeping: visual hacking. In this paper, we have proposed an effective privacy-protection method to overcome the limitation of the detection range of a TOF sensor, and verified it with experimental demonstrations. We expect that the proposed system can be applied to various kinds of display devices to eliminate concerns over visual hacking.
Moreover, since those conventional protections are not switchable, the user can feel uncomfortable due to the narrower viewing angle, even with a situation that no protection is required. In this paper, we propose a novel privacy-protection technique to adopt a directional backlight and facial-recognition system with higher accuracy and extended detection range, by combining a time-of-flight (TOF) sensor with facial recognition. An experimental demonstration is also provided to verify the proposed scheme.
To verify the proposed scheme, an experimental demonstration to recognize the face’s position closer than the minimum detection range of the TOF sensor is also provided.

참고문헌 (8)

P. Barker, "Visual hacking - why it matters and how to prevent it," Netw. Secur. 42, 14-17 (2019).
H. Yoon, S.-G. Oh, D. S. Kang, J. M. Parck, S. J. Choi, K. Y.Suh, K. Char, and H. H. Lee, "Arrays of Lucius microprisms for directional allocation of light and autostereoscopic three-dimensional displays," Nat. Commun. 2, 455 (2011).

상세보기
G. E. Gaides, I. A. Kadoma, D. B. Olson, R. A. Larson, and A. R. Sykora, "Light collimating film," U.S. Patent 8012567B2 (2011).
J.-H. Kim, C. H. Lee, S. S. Lee, and K.-C. Lee, "Highly transparent privacy filter film with image distortion," Opt. Express 22, 29799-29804 (2014).

상세보기
T. Guzvinecz, V. Szucs, and C. Sik-Lanyi, "Suitability of the Kinect Sensor and Leap Motion Controller-A Literature Review," Sensors 19, 1072 (2019).

상세보기
C. Kim, S. Yun, S-.W. Jung, and C. S. Won, "Color and depth image correspondence for Kinect v2," in Advanced Multimedia and Ubiquitous Engineering (Lecture Notes in Electrical Engineering Series, Vol. 352), J. H. Park, H.-C. Chao, H. Arabnia, and N. Y. Yen, eds. (Springer, Berlin, Heidelberg, Germany, 2015), pp. 111-116.
H. Kwon and H.-J. Choi, "A time-sequential multi-view autostereoscopic display without resolution loss using a multidirectional backlight unit and an LCD panel," Proc. SPIE 8288, 82881Y (2012).
S. G. de Groot and J. W. Gebhard, "Pupil size as determined by adapting luminance," J. Opt. Soc. Am. 42, 492-495 (1952).

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DOI : 10.3807/COPP.2020.4.5.421 [무료]
한국광학회 : 저널
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