• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2020.11a
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• pp.388-391
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• 2020

최근 스마트폰과 어플리케이션의 기술 발전으로 일상생활에서 은행의 주거래 혹은 보안인증으로 생체정보를 이용하는 것이 급격히 확대되고 있다. 이러한 생체정보 보호를 위해 디지털 콘텐츠 내에 저작권자의 정보를 삽입하여 정보를 보호하는 기술인 워터마킹 기술을 도입하여 생체정보의 복제 혹은 도용 시에 발생할 수 있는 문제를 예방하는 것이 본 연구의 목적이다. 본 논문에서는 홍채 이미지에 DWT를 적용한후 QIM 방식을 이용해 임의의 QR코드로 워터마크를 삽입하여 홍채 코드를 추출한후 워터마크를 삽입하기 전의 홍채코드와 삽입 후의 홍채코드를 PSNR 통해 비교 분석하고 Stirmark 에서 제공하는 강인성 테스트를 이용해 강인성의 정도를 알아본다.

• The Journal of the Korea Contents Association
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• v.17 no.9
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• pp.466-475
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• 2017

Various factors in daily life cause stress, which could stem from trivial or major events. Stress is not appeared at any time but is appeared over the lifetime. Therefore, it is necessary to conduct studies to identify ways to manage stress. In the present study, we developed an iris analysis-based system to diagnose and manage stress. By analyzing its correlation with the degree of stress measured using the iris diagnosis and a questionnaire, the user's degree of stress quantitates. The system proposed in this study can be used to measure the degree of stress experienced by the user, which can be an effective method for the early diagnosis and prevention of stress-related diseases.

• Journal of Korean Ophthalmic Optics Society
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• v.14 no.2
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• pp.31-34
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• 2009

Purpose: We are to analyze optically how to affect the eye related with movement of the iris. Methods: Using the schematic eye to have the crystalline lens of the radial GRIN and the spherical GRIN forms that come to be planned in existing, the iris centre was moved 0.5 mm with nasal direction in order to be identical with the real eye. Also, considering that the iris centre move according to increase of the pupil size, the iris centre was moved 0.4 mm with temporal direction to analyze the optical performance change of the eye respectively. Results: Because of decrease in the spherical aberration, the schematic eye with nasal direction 0.5 mm eccentricity of the iris showed a different consequence plentifully compared with the performance of the real eye. Besides, the schematic eye with temporal direction 0.4 mm eccentricity of the iris showed that the spherical aberration somewhat increased. Conclusions: In case of design of the schematic eye with the similar real eye performance which the iris centre was moved 0.5 mm with nasal direction, we need to research about aspheric coefficient of optical constants of each refracting surface considering the performance change of a spherical aberration, a peripheral power error and astigmatism etc, owing to change of the real eye hence to be affected by the iris movement.

• Journal of KIISE:Software and Applications
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• v.30 no.9
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• pp.876-884
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• 2003

It is essential to identify both the pupil and iris boundaries for iris recognition. The circular edge detector proposed by Daugman is the most common and powerful method for the iris region extraction. The method is accurate but requires lots of computational time since it is based on the exhaustive search. Some heuristic methods have been proposed to reduce the computational time, but they are not as accurate as that of Daugman. In this paper, we propose a pupil and iris boundary finding algorithm which is faster than and as accurate as that of Daugman. The proposed algorithm searches the boundaries using the Daugman's circular edge detector, but reduces the search region using the problem domain knowledge. In order to find the pupil boundary, the search region is restricted in the maximum and minimum bounding circles in which the pupil resides. The bounding circles are obtained from the binarized pupil image. Two iris boundary points are obtained from the horizontal line passing through the center of the pupil region obtained above. These initial boundary points, together with the pupil point comprise two bounding circles. The iris boundary is searched in this bounding circles. Experiments show that the proposed algorithm is faster than that of Daugman and more accurate than the conventional heuristic methods.

• Journal of Korean Ophthalmic Optics Society
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• v.19 no.3
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• pp.285-293
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• 2014

Purpose: In order to find suitable size of soft contact lens for different ages group of elementary student to adults, visible iris diameter(horizontal, vertical) and palpebral aperture size were measured. Methods: Visible iris diameter (horizontal, vertical) and palpebral aperture size were measured in different age groups of total 514 subjects (1028 eyes) who have no eye disease and none history of surgery included cosmetic purpose. Results: No significant difference was found in iris diameter of both horizontal and vertical direction for different groups of age and sex but horizontal direction of palpebral aperture size in middle school students and university students groups and vertical direction of palpebral aperture size in high school student group shows significant difference (p<0.05) by sex. Horizontal visible iris diameter, vertical visible iris diameter, horizontal palpebral aperture size and vertical palpebral aperture size shows significant difference in difference age and sex. Conclusions: Visible iris diameter and palpebral aperture size are affective factor for soft contact lens diameter decision, especially it should considered more intensive for removing uncomfortable feeling of lens wearer.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.826-828
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• 2004

홍채인식 시스템은 영상획득, 전처리, 특징 추출, 패턴 정합의 단계로 이루어져 있다. 이 중 특징 추출은 특징 차원의 감소뿐만 아니라 분류 정착도의 증가를 위한 필수적인 과정이다. 본 논문에서는 특징을 추출하는데 있어서, 홍채데이타에 웨이블렛 변환의 다해상도 분석 기법을 시도하여 일정 영역을 추출한 후, 그 영역에 유전자 알고리즘(Genetic Algorithm)을 적용하여 가장 분별력 있는 특징들만을 추출 및 사용하는 홍채인식 시스템을 제안한다. 유전자 알고리즘의 선택연산자로는 적응도 비례 방식과 전역 엘리트 방식을 사용하였으며, 적합도 함수로는 Gaussian Kernel을 사용하는 Support Vector Machine(SVM)을 사용하였다. 본 시스템을 통해 나온 최적의 특징집합을 이용한 SVM분류기로 인식률을 알아본 결과 웨이블렛만을 사용했을 때 보다 대략 1.5%정도 더 좋은 인식률을 얻을 수 있었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.05a
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• pp.705-708
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• 2018

Among biometrics commercialized for security, iris recognition technology has the most excellent security for the probability of the match between individuals is the lowest. Current commercialized iris recognition technology has excellent recognition ability, but this technology has a fatal drawback. Without the user's active cooperation, it cannot recognize the iris correctly. To make up for this weakness, recent trend of iris recognition development mounts a non-volunteering, unconstrained method. According to this information, the objective of this research is developing a module that can identify people iris from a video acquired by high performance infrared camera in a range of 3m and in a involuntary way. For this, we import images from the video and find people's face and eye positions from the images using Haar classifier trained through Cascade training method. finally, we crop the iris by Hough circle transform and compare it with data from the database to identify people.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.1530-1533
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• 2015

본 논문은 지문, 홍채, 얼굴 및 서명 이미지를 수집하고, 이를 기 수집된 생체정보들과 비교 분석하여 고유한 개인 정보를 생성함으로써, 회원 및 직원 등 소규모 단위뿐만 아니라, 국가 단위의 주민 정보에도 활용 가능한 생체정보 수집 시스템의 설계 및 구현에 관한 것이다. 제안 시스템은 개인정보 수집기, 생체정보 수집기(지문수집기, 홍채수집기, 얼굴수집기 및 서명 수집기), 생체정보 검증기(지문검증기, 홍채검증기)와 생체정보 관리기로 구성되어 있으며, 웹페이지 형태의 개인정보 수집기에서 Java로 구현된 생체정보 수집기의 호출 및 데이터 송수신을 위해, 최근 기술적 추세에 맞추어 자바애플릿 형태가 아닌 브라우저 플러그인 형태의 데이터 연동모듈을 구현하였다.

• Journal of Korean Ophthalmic Optics Society
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• v.15 no.2
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• pp.151-154
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• 2010

Purpose: We investigated how the movement of iris and visual axis affects the finite schematic eye Methods: Using the schematic eye with the crystalline lens in the existing forms of the radial GRIN and the spherical GRIN, the iris centre was moved 0.5 mm in nasal direction and visual axis was tilted $5^{\circ}$ in same direction, with the additional degree of 2.5 down to locate the focal point in fovea. This study analyzed performance change of the optical system, designing it same as the real eye. Results: The whole aberration distribution showed a considerable difference in performance in comparison with the real eye; the biggest difference shown at the central field of optical system. The spherical aberration showed the biggest difference, and a peripheral power error and field curvature leaned toward (+) direction in aberration distribution. Conclusions: When designing the schematic eye with the performance similar with that of the real eye by taking into consideration the iris centre and visual axis, the aberration at the center field of optical system in particular should be corrected. Spherical aberration which showed the biggest difference should be corrected in the first place. In addition, a peripheral power error and field curvature that leaned toward (+) direction should be moved toward (-) direction.

• Journal of Korea Multimedia Society
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• v.8 no.9
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• pp.1227-1238
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• 2005

Recently, with the advance of network and internet technologies, it is appeared the Problem that the digital contents such as image, voice and video are illegally pirated and distributed. To protect the copyright of the digital contents, the digital watermarking technology of inserting the provider's information into the contents has been widely used. In this paper, we propose the method of applying the digital watermarking into biometric information such as fingerprint and iris in order to prevent the problem caused by steal and misuse. For that, we propose the method of inserting watermark in frequency domain, compare the recognition performance before and aster watermark inserting. Also, we experiment the robustness of proposed method against blurring attack, which is conventionally taken on biometrics data. Experimental results show that our proposed method can be used for protecting iris and fingerprint data, efficiently.