• Title/Summary/Keyword: Photo identification

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Validity of Photo-identification Method for Spotted Seals on Baekryongdo, Korea (사진을 통한 백령도 점박이물범의 개체식별 가능성 파악)

  • Kim, Hyun-Woo;An, Yong-Rock;Park, Tae-Geon;Kim, Zang-Geun;Moon, Dae-Yeon;Choi, Seok-Gwan
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.43 no.4
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    • pp.340-344
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    • 2010
  • Identification of individuals is a standard tool used to study animal behavior and ecology. Numerous studies based on photographic identifications of various marine mammal populations have been successfully conducted. The objective of this study was to validate a photo-identification method for spotted seals. We tested the method using 4,939 photographs gathered in 30 field surveys from 2006 to 2008 on Baekryongdo, Korea. In 2006, 20 individuals were identified and cataloged using unique spot patterns on their left chick pelages as a natural marker. In 2007 and 2008, three and nine individuals, respectively, were recaptured, with six individuals continually recaptured during the entire survey period. We confirmed that the spot patterns of spotted seal pelages were constant in shape and location throughout time. These characteristics offered an opportunity to consistently identify individuals within a population over the long survey period. The use of photo-identification has great potential for mark-recapture studies.

Coastal Resident Stock of Bottlenose Dolphins in the Jeju Islands (제주 연안에 출현하는 큰돌고래(Bottlenose dolphins) 연안 정착성 개체군)

  • Choi, Seok-Gwan;Kim, Hyun-Woo;An, Yong-Rock;Park, Kyum-Joon;Kim, Zang-Geun
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.42 no.6
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    • pp.650-656
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    • 2009
  • Recently, bottlenose dolphins have frequently appeared in coastal waters of the Jeju Islands. To determine whether these individuals belong to one or more pods, the Cetacean Research Institute (CRI) established visual and photo-identification surveys in the Jeju Islands from November 2007 to July 2009. During visual surveys, pods composed of 10 to 80 individuals were sighted mainly in the northeastern and northwestern of Jeju Islands. Eighty-nine individuals were identified and cataloged by photo-identification using natural nicks and notches on their dorsal fins. Thirty-six individuals were identified three times or more, and nine individuals were identified five times during seven surveys. One individual appeared in November 2007, August 2008, October 2008, April 2009, and July 2009. The results of our study confirm that these dolphins represent a coastal resident stock. Futhermore, we will establish dolphin abundance, management, and usage studies using continuous visual and photo-identification surveys.

Feasibility of Photo-identification Techniques for the Bottlenose Dolphins(Tursiops truncatus) from Jeju Island, Korea

  • Song, Kyung-Jun;Kim, Zang-Geun;An, Yong-Rock;Choi, Seok-Gwan;Sohn, Haw-Sun;Zhang, Chang-Ik
    • Fisheries and Aquatic Sciences
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    • v.11 no.3
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    • pp.166-171
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    • 2008
  • The feasibility of photo-identification techniques for the bottlenose dolphins from Jeju Island, Korea, and the potential for dolphin watching were simultaneously evaluated in this study. During the sighting survey, a pod of bottlenose dolphins composed of approximately 30 individuals was observed in the southwestern coastal area of Jeju Island. Among 35 suitable photographs, five bottlenose dolphin individuals were identified and cataloged using unique nicks and notches on their dorsal fins. This shows that the Jeju Island dolphins can be individually identified by the nicks and notches on their dorsal fins using photo-identification techniques. Furthermore, the Jeju Island population appears to be suitable for long-term population biology studies using this technique. The potential for dolphin watching around the island would be higher if more information on the seasonal distribution, movement, and residency of this population were obtained.

Photo - Interpretation and Identification of Three Species on Panchromatic Film (흑백사진상(黑白寫眞上)의 수종식별(樹種識別))

  • Shim, Jong-Supp;Han, Kap-Joon
    • Journal of the Korean Wood Science and Technology
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    • v.10 no.3
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    • pp.190-193
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    • 1982
  • Conclusion: The results of this study are encouraging for the development of a set of interpretable diagnostic criteria for a reasonably reliable identification of some species. The present study has been limited in the characteristics studied and was made on relatively poor photography. Further study on high quality photography, over wider areas and including such additional characteristics as crown texture and shadow intensity should prove useful. A preliminary examination has been made of some photo-image characteristics of a number of important tree species on large scale (1:9,000) contact prints of panchromatic mm. The characteristics studied were crown image tone, and shape. Image tone was estimated against a standard grey-scale and shows within-species consistency and a range between species. Crown shapes were subjectively assessed but there appears to be a within-species consistency and interpretable between-species differences. The results of this trial suggest that it should be practicable to make a number of important species distinctions by photo-interpretation with a useful degree of reliability. Other characteristics beside those studied might be usefully examined. Photography: Hand-printed glossy contact prints of vertical 1:9,000 scale panchromatic photography of Kwangnung Experimental Forest flown May 1964. The filter used is unknown (probably minus-blue). The camera is unknown but was probably a military type K-17 or K-22 with 6"(apostfophy) lens. The photography shows notably poor resolution. Species: 143 individual trees ranging through 11 species (7 softwood, 4 hardwood) were included in the study. A range of size classes were included for each species.

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Ocean Fog Detection Alarm System for Safe Ship Navigation (선박 안전항해를 위한 해무감지 경보 시스템)

  • Lee, Chang-young
    • Journal of Advanced Navigation Technology
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    • v.24 no.6
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    • pp.485-490
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    • 2020
  • Recently, amid active research on domestic shipbuilding industry and IT convergence technology, with the development of satellite detection technology for ship safety operation, ships monitored the movement of ships with the mandatory long-range identification & tracking of vessels and automatic identification system. It is possible to help safe navigation, but it is necessary to develop safety device that alert the marine officer who rely on radar to correct conditions in case of weightlessness. Therefore, an ocean fog alarm system was developed to detect and inform using photo sensors. The fabricated ocean fog detect and alarm system consists of a small, low-power optical sensor transceiver and data sensing processing module. Through experiment, it is confirmed that the fabricated ocean fog detect and alarm system measure the corresponding concentration of ocean fog for fogless circumstance and fogbound circumstance, respectively. Furthermore, the fabricated system can control RPM of ship engine according to the concentration of ocean fog, and consequently, the fabricated system can be applied to assistant device for ship safety operation.

Image Watermarking for Identification Forgery Prevention (신분증 위변조 방지를 위한 이미지 워터마킹)

  • Nah, Ji-Hah;Kim, Jong-Weon;Kim, Jae-Seok
    • The Journal of the Korea Contents Association
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    • v.11 no.12
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    • pp.552-559
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    • 2011
  • In this paper, a new image watermarking algorithm is proposed which can hide specific information of an ID card's owner in photo image for preventing ID's photo forgery. Proposed algorithm uses the image segmentation and the correlation peak position modulation of spread spectrum. The watermark embedded in photo ensures not only robustness against printing and scanning but also sufficient information capacity hiding unique number such as social security numbers in small-sized photo. Another advantage of proposed method is extracting accurate information with error tolerance within some rotation range by using $2^h{\times}2^w$ unit sample space not instead $1{\times}1$ pixels for insertion and extraction of information. 40 bits information can be embedded and extracted at $256{\times}256$ sized ID photo with BER value of 0 % when the test condition is 300dpi scanner and photo printer with 22 photos. In conclusion, proposed algorithm shows the robustness for noise and rotational errors occured during printing and scanning.

Visible Light Identification System Using Optoelectronic Feedback of A Lighting LED (조명용 LED의 광전궤환을 이용한 가시광 무선인식장치)

  • Lee, Seong-Ho
    • Journal of Sensor Science and Technology
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    • v.20 no.3
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    • pp.193-198
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    • 2011
  • In this paper, we used optoelectronic feedback to generate the carrier frequency for the ASK modulation of a lighting LED. A solar cell was used for photo-detector in the feedback circuit, and the LED light was ASK modulated by controlling the ON/OFF state of the switch that is installed in the feedback loop. The oscillation frequency of the optoelectronic feedback loop was about 50 kHz and the data rate of the ASK modulation was 9.6 kbps. In experiments, the optoelectronic feedback circuit was used for the ASK modulation of a lighting LED in the transponder of a visible light identification system, and data exchange between the transponder and the reader was successfully carried out.

Aqueous Glucose Solution Measurement by Three Types NIR Spectrometer (세 가지 방식의 근적외선 분광분석기를 이용한 글루코오스 수용액의 측정)

  • 백주현;강나루;우영아;김효진
    • YAKHAK HOEJI
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    • v.47 no.6
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    • pp.461-468
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    • 2003
  • A method is described for measuring clinically relevant levels of glucose in a pH 7.4 phosphate buffer by nearinfrared (NIR) absorption spectroscopy. Three types of NIR spectrometer, dispersive type, photo-diode array (PDA) type, and fourier transform (FT) type spectrometer were used and the performance was compared. Spectra were collected with a cuvette cell or quartz liquid fiber of 1 mm or 2 mm optical pathlength as transmittance method. Glucose absorption band appeared at second overtone, first overtone, and combination region for all systems. By use of the multivariate technigue of partial least squares (PLS) regression, glucose concentrations can be determined with a 16, 44, and 9.1 mg/d l standard error of prediction for dispersive type, photo-diode array type, and fourier transform type system, respectively. Sensitivity of spectrometer was evaluated by absorbance for the difference of 10 mg/d l glucose. Three absorption bands, second overtone, first overtone, and combination region were suited to three types systems, dispersive type, photo-diode array type, and fourier transform type systems, respectively. This investigation showed that three types NIR spectrometer were proper method for identification and quantitative analysis of glucose and possible for noninvasive blood glucose monitoring.

Comparison of physical properties and dye photo-degradation effects for $carbon/TiO_2$ complexes

  • Oh, Won-Chun;Lim, Chang-Sung
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.17 no.5
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    • pp.196-203
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    • 2007
  • We have studied a method for the preparation of hybrid $carbon/TiO_2$ complexes involving pitch coating, pitch binding and the penetration of titanium n-butoxide(TNB) solution with porous carbon. The photocatalysts were investigated with surface textural properties and SEM morphology, structural crystallinity and elemental identification between porous carbon and $TiO_2$, and dye decomposition performance. For the all $carbon/TiO_2$ complexes prepared by some kinds of different methods, the excellent photocatalytic effect for dye degradation should be attributed to the both effects between photo-decomposition of the supported $TiO_2$ and adsorptivity of the porous carbons.

Experiments and its analysis on the Identification of Indoor Location by Visible Light Communication using LED lights (LED 조명 기반 가시광 무선 통신을 이용한 실내 위치 인식 실험 및 분석)

  • Kong, In-Yeup;Kim, Ho-Jin
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.5
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    • pp.1045-1052
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    • 2011
  • Recently, because of complex cultural space, underground space are becoming larger. Therefore, the demand for location-based services is growing. VLC (Visible Light Communication) is based on the LED lighting infrastructure so that suitable LBS (Location-based service) is possible for the targeted places in indoor space. To experiment with indoor LBS by VLC, we measure the identification distance according to variable angles between LED and photo diode. We send the different ASCII code for each LED light, then we found the maximum identification distance is 1.75m from LED lights. From the results of this experiment, we show that indoor navigation is possible.