• Title/Summary/Keyword: iris

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Feature Extraction for Iris Recognition Using Scale-Space Filtering (스케일 스페이스 필터링을 이용한 홍채 특징 추출)

  • Hong, Jin-Il;Kim, Dong-Min;Yang, Woo-S.
    • Journal of IKEEE
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    • v.6 no.2 s.11
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    • pp.169-177
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    • 2002
  • In this paper, we introduce a new technology to extract the unique features from an iris image, which uses scale-space filtering. Resulting iris code can be used to develop a system for rapid and automatic identification of persons, with high reliability and confidence levels. First, an iris part is separated from the whole image. Then the radius and center of the iris are obtained. Once the regions that have a high possibility of being noise are discriminated, the features presented in the highly detailed pattern is then extracted from the iris image. Scale-space filtering technique is applied for feature extraction.

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Sequence Analysis of the Coat Protein Gene of a Korean Isolate of Iris Severe Mosaic Potyvirus from Iris Plant

  • Park, Won-Mok;Lee, Sang-Seon;Park, Sun-Hee;Ju;Ryu, Ki-Hyun
    • The Plant Pathology Journal
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    • v.16 no.1
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    • pp.36-42
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    • 2000
  • The coat protein gene of iris severe mosaic potyvirus, which was isolated in Korea, ISMV-K, from iris plant was cloned and its nucleotide sequence was determined. The coat protein of the virus contained 252 amino acid residues, including five potential N-glyxosylation site motifs. The coat protein of ISMV-K has 99.1% and 98.4% sequence identities with those of the Netherlands isolate of ISMV (ISMV-Ne) form crocus for the nucleotide and amino acids, respectively. The coat protein of ISMV-K has 50.4% to 60.3% nucleotide sequence identities and 47.3% to 55.7% amino acid identities with those of other 21 potyviruses, indicating ISMV to be a distinct species of the genus. The coat protein of ISMV-K was closely related with bean yellow mosaic virus and clover yellow vein virus in the phylogenetic tree analysis among the potyviruses analyzed. ISMV was easily and reliably detected from virus-infected iris leaves by RT-PCR with a set of the virus-specific primers.

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Enhancement of Iris Masking Security using DNN and Blurring (DNN과 블러링을 활용한 홍채 마스킹 보안 강화 기술)

  • Seungmin Baek;Younghae Choi;Chanwoo Hong;Wonhyung Park
    • Convergence Security Journal
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    • v.22 no.4
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    • pp.141-146
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    • 2022
  • The iris, a biometric information, is safe, unique, and reliable, such as fingerprints, and is personal information that can significantly lower the misrecognition rate than other biometric authentication. However, due to the nature of biometric authentication, it is impossible to replace it if it is stolen. There is a case in which an actual iris photo is taken and 3d printed so that the eyes work as if they were in front of the camera. As such, there is a possibility of iris leakage through high-definition images and photos. In this paper, we propose to improve iris masking performance by supplementing iris region masking research based on existing blurring techniques. Based on the results derived in this study, it is expected that it can be used for the security of video conference programs and electronic devices.

Analysis of waveguide iris using FEM-BIM its application to waveguide filter design (유한 요소 경계 적분법을 이용한 구형 도파관 내 임의의 형상 iris 해석 및 도파관 여파기 설계에의 응용)

  • 박종근;남상욱
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.22 no.6
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    • pp.1244-1250
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    • 1997
  • An arbitrary shaped iris in rectangular waveguideis investigated using FEM-CDMA with triangularprism elements in this paper. The volume of irisis subdivided into a relatively small number of triangular prism elements and FEM is used to formulate the field distribution. On the other hand, the fields in the waveguide region are represented by BIM derived from the waveguide Green's function and boundary conditions. The proposed method is verified through the design and experiment for the circular iris filter using WR-90 waveguide.

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The effect of cavity wall property on the shear bond strength test using iris method (Iris 법을 이용한 전단접착강도 측정에서 와동벽의 영향)

  • Kim, Dong-Hwan;Bae, Ji-Hyun;Cho, Byeong-Hoon;Lee, In-Bog;Baek, Seung-Ho;Ryu, Hyun-Mi;Son, Ho-Hyun;Um, Chung-Moon;Kwon, Hyuck-Choon
    • Restorative Dentistry and Endodontics
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    • v.29 no.2
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    • pp.170-176
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    • 2004
  • Objectives : In the unique metal iris method. the developing interfacial gap at the cavity floor resulting from the cavity wall property during polymerizing composite resin might affect the nominal shear bond strength values. The aim of this study is to evaluate that the iris method reduces the cohesive failure in the substrates and the cavity wall property effects on the shear bond strength tests using iris method. Materials and Methods : The occlusal dentin of 64 extracted human molars were randomly divided into 4 groups to simulate two different levels of cavity wall property (metal and dentin iris) and two different materials ($ONE-STEP^{\circledR}$ and $ALL-BOND^{\circledR}$ 2) for each wall property. After positioning the iris on the dentin surface. composite resin was packed and light-cured. After 24 hours the shear bond strength was measured at a crosshead speed of 0.5 mm/min. Fracture analysis was performed using a microscope and SEM. The data was analyzed statistically by a two-way ANOV A and t-test. Results : The shear bond strength with metal iris was significant higher than those with dentin iris (p=0.034). Using $ONE-STEP^{\circledR}$, the shear bond strength with metal iris was significant higher than those with dentin iris (p=0.005), but not in $ALL-BOND^{\circledR}$ 2 (p=0.774). The incidence of cohesive failure was very lower than other shear bond strength tests that did not use iris method. Conclusions:The iris method may significantly reduce the cohesive failures in the substrates. According to the bonding agent systems. the shear bond strength was affected by the cavity wall property.

A phylogenetic study of Korean Iris L. based on plastid DNA (psbA-trnH, trnL-F) sequences (Plastid DNA (psbA-trnH, trnL-F)의 염기서열에 의한 한국산 붓꽃속(Iris L.)의 계통분류학적 연구)

  • Lee, HyunJung;Park, SeonJoo
    • Korean Journal of Plant Taxonomy
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    • v.43 no.3
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    • pp.227-235
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    • 2013
  • Molecular phylogenetic studies were conducted to evaluate taxonomic identities and relationships among 16 species of the korean genus Iris L. Korean Iris was grouped by five clades. Series Laevigatae, Tripetalae, Laevigatae and Sibiricae was included to Clade I. Series Chinensis, and Easatae was composed to Clade II. Series Chinensis was included to Clade III. Series Chinensis was composed to Clade IV. Series Crossiris, Pumilae and Pardanthopsis was included to Clade V. Iris dichotoma, I. mandshurica and I. tectorum formed one clade, and it was located mostly in the basal group. I. minutiaurea and I. koreana was not formed independent clade, so it is not clear between them about taxonomic identities. Iris tectorum was established taxonomic system by Series Cossiris in Subgenus Crossiris. Series Chinensis (I. odaesanensis, I. minutiaurea, I. koreana, I. rossii var. latifoia, and I. rossii) was distinguished is clear by Series Chinensis (I. odaesanensis, I. minutiaurea and I. koreana) and Series Chinensis (I. rossii var. latifoia and I. rossii). The Genus Iris was divided into four subgenus (Limniris, Crossiris, Iris and Pardanthopsis). We thought that evolved to subgenus Limniris in subgenus Crossiris, iris and Pardanthopsis.

The Composition of Useful Medium Chain Fatty Acids in Eight Plant Species (특이지방산의 탐색과 붓꽃류에서 중쇄지방산(myristic acid)의 확인)

  • Kim, Jong-Bum;Kim, Kyung-Hwan;Hwang, Sun-Kap;Kim, Yong-Hwan;Cho, Kang-Jin;Hwang, Young-Soo;Park, Ro-Dong;Kim, Jung-Bong
    • Applied Biological Chemistry
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    • v.44 no.1
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    • pp.20-23
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    • 2001
  • Several unusual fatty acids including myristic acid (14 : 0) and lauric acid (12 : 0) were investigated in the Iris family and other related plants. Especially the roots of Iris tecorum contained 75.9% myristic acid in total fatty acid contents and that of Iris germanica contained 57% myristic and 15.5% lauric acid (12 : 0) whereas 10.7% lauric acid and 9.5% capric acid (10 : 0) were detected in the roots of iris ensata as compared to the total fatty acid contents. The total fatty acid contents in the seeds of Foeniculi fructus and Torilis japonica was relatively higher 193.3 mg/g dry wt and 128.2 mg/g dry wt, respectively. 64.5% linoleic acid (18 : 2) and 48.9% ${\alpha}-linolenic$ acid (18 : 3) were observed in the seeds and leaves of iris tectorum whereas its lateral roots contained 9.5% caprylic acid (8 : 0) and 8.6% capric acid. The percentage of myristic acid of the total fatty acid in the immature seeds of iris tectorum and Iris germanica was 10.8% and 15.6%, respectively.

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Eddy Current and Ultrasonic IRIS Signal Characteristics of Reboiler Tube by Using STS 316L Calibration Specimen (STS 316L 교정시험편을 이용한 재가열기 튜브의 와전류신호와 초음파 IRIS 신호 특성)

  • Tak, Kyeong-Joo;Kim, Byung-Il;Gook, Jin-Seon
    • Journal of the Korean Society for Nondestructive Testing
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    • v.32 no.1
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    • pp.56-63
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    • 2012
  • In this study, a field applicability of reboiler tube was evaluated by comparing ECT signal with IRIS signal about wall loss rate and remaining wall thickness using worked austenite STS 316L ASME standard calibration tube. In the case of wall-loss rate, as a result, tolerance about $20%{\times}4$ flat bottom hole and 10% O D groove(ECT), 80% defect and 10% O D groove(IRIS) occurred up to ${\pm}15%$. In the case of remaining wall thickness, ECT was satisfied with the both tolerance, but tolerance about 80% defect occurred up to ${\pm}15%$ in IRIS. Therefore, if the IRIS is performed for interpretation of non-relevant indication and measurement of wall-loss rate after ECT, reliability is supposed to be improved.

Robust iris recognition for local noise based on wavelet transforms (국부잡음에 강인한 웨이블릿 기반의 홍채 인식 기법)

  • Park Jonggeun;Lee Chulhee
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.42 no.2 s.302
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    • pp.121-130
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    • 2005
  • In this paper, we propose a feature extraction method for iris recognition using wavelet transforms. The wavelet transform is fast and has a good localization characteristic. In particular, the low frequency band can be used as an effective feature vector. In iris recognition, the noise caused by eyelid the eyebrow, glint, etc may be included in iris. The iris pattern is distorted by noises by itself, and a feature extraction algorithm based on filter such as Wavelets, Gabor transform spreads noises into whole iris region. Namely, such noises degrade the performance of iris recognition systems a major problem. This kind of noise has adverse effect on performance. In order to solve these problems, we propose to divide the iris image into a number of sub-region and apply the wavelet transform to each sub-region. Experimental results show that the performance of proposed method is comparable to existing methods using Gabor transform and region division noticeably improves recognition performance. However, it is noted that the processing time of the wavelet transform is much faster than that of the existing methods.

Effects of Light, Temperature, and Sucrose on Plant Regeneration from the Flower Organ Explant in Iris ensata (꽃창포 화기조직 절편체 배양으로부터 식물체 분화에 미치는 광.온도.당의 영향)

  • Yoon, In-Kyung;Koh, Jae-Chul
    • Journal of Plant Biotechnology
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    • v.30 no.1
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    • pp.41-45
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    • 2003
  • A study was under taken to investigate the appropriate explant sources of flower organ and suitable cultural conditions such as light, temperature, and sucrose in plant regeneration of Iris ensata culture. Explants of perianth, ovary, pedicel, and peduncle of Iris ensata were cultured at different daylength (0, 8, 16, 24 hour), different temperatures (10, 15, 25, 3$0^{\circ}C$), and sucrose concentrations (1, 3, 6, 9%) on MS medium. Formation of adventitious roots from explants of Iris ensata was effective in the dark, while that of adventitous shoots was effective in the light. The optimum daylength for young plant regeneration was 16 hours. The optimum temperature for shoot formation of Iris ensata explants was $25^{\circ}C$ but the formation at 10 and 15$^{\circ}C$ was ineffective. Especi-ally, perianth and ovary was effective in shoot formation from flower organ expants. T-he optimum concentration of sucrose for shoots and roots formation of Iris ensata explants was 3 and 6%, respectively.