• Title/Summary/Keyword: MAGE-3

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Measurement of Spatial Resolution in Fiber-optic Image Guides

  • Lee, Bong-Soo
    • Journal of the Optical Society of Korea
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    • v.5 no.2
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    • pp.33-36
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    • 2001
  • Common methods of determining the spatial resolution of fiber-optic image guides are by measuring the diameter of individual microfibers or by the use of a resolution test target. However these methods cannot provide enough information of spatial resolution in ultrathin fiber-optic image guides. In this study, a simple method to measure the modulation transfer function (MTF) of an mage guide was developed. The MTFs of ultrathin image guides with 3 and 4${\mu}{\textrm}{m}$ Um diameter were measured by examining transmitted sharp edge image. This method should be especially useful for measuring spatial resolution of ultrahigh resolution image guides with less than 5 ${\mu}{\textrm}{m}$ diameter microfibers because their spatial resolution cannot be determined by individual microfiber diameter due to crosstalk and leaky ray phenomena.

A Study on Image Noise Reduction Technique for Low Light Level Environment (저조도 환경의 영상 잡음제거 기술에 관한 연구)

  • Lee, Ho-Cheol;Namgung, Jae-Chan;Lee, Seong-Won
    • Journal of the Korean Society for Railway
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    • v.13 no.3
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    • pp.283-289
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    • 2010
  • Recent advance of digital camera results in that image signal processing techniques are widely adopted to railroad security management. However, due to the nature of railroad management many images are acquired in low light level environment such as night scenes. The lack of light causes lots of noise in the image, which degrades image quality and causes errors in the next processes. 3D noise reducing techniques produce better results by using consecutive sequence of images. On the other hand, they cause degradation such as motion blur if there are motions in the sequence. In this paper, we use an adaptive weight filter to estimate more accurate motions and use the result of the adaptive filter to 3D result to improve objective and subjective mage quality.

Stimulatory Effect of Ga-As Infrared Laser on the Regeneration of Injured Sciatic Nerves (손상된 좌골신경의 재생에 미치는 Ga-As 적외선 레이저의 효과)

  • 배춘식;임성철;박석천
    • Journal of Veterinary Clinics
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    • v.19 no.3
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    • pp.316-321
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    • 2002
  • The purpose of this study was to examine the effect of Ga-As(Gallium-Arsenide, wave length; 904 nm) infrared laser irradiation on healing of the experimentally crush injured rat sciatic nerves. The bilateral sciatic nerves of 43 adult male Sprague-Dawley rats were compressed surgically with a straight hemostat (1 mm width). The right legs of all the rats were irradiated using a 27 mW Ga-As infrared laser (laser irradiated group). The radiation procedure was administered for 3 minutes every day for 1, 3, 5, and 7 weeks in each group. Left legs were not irradiated and served as the control group. The numbers of total myelinated axon and degenerated myelin in the sciatic nerves of bilateral legs were measured and analyzed with mage analysis system in order to make a morphological analysis of the effect of the Ga-As infrared laser on injured nerves. Total number of myelinated axons was increased with time interval, especially in the 1, 3. and 5 week of irradiated group. Conversely, the number of degenerated myelin was decreased with time interval, especially in the irradiated group. The effects in the irradiated group were more pronounced than those of the control group. In conclusion, the Ga-As infrared laser irradiation is a useful adjuvant therapy to the regeneration of the peripheral nerve injury.

A Study on Bubble Behavior Generated by an Air-driven Ejector for ABB (Air Bubble Barrier) (II): Comparison of Bubble Behavior with and without Ejector (공기구동 이젝터를 이용한 ABB (Air Bubble Barrier)의 기포거동 특성 연구 (II): 기포거동 특성의 비교 분석)

  • Seo, Hyunduk;Aliyu, Aliyu Musa;Kim, Hyogeum;Kim, Kyung Chun
    • Journal of the Korean Society of Visualization
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    • v.15 no.2
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    • pp.59-67
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    • 2017
  • To verify floatability of ABB (Air bubble barrier), we compared bubble swarm behavior with and without the air-driven ejector. Experiment was conducted using the fabricated air-driven ejector with 5 mm nozzle on the bottom of 1 m3 water tank. Reynolds number of air in the nozzle was ranged 1766-13248. We analyzed data with statistical method using image processing, particle mage velocimetry (PIV) and proper orthogonal decomposition (POD) analysis. As a result of POD analysis, there was no significant eigenmode in bubbly flow generated from the ejector. It means that more complex turbulent flows were formed by the ejector, thereby (1) making bubbles finer, (2) promoting three-dimensional energy transfer between bubble and water, and (3) making evenly distributed velocity profile of water. It is concluded that the air-driven ejector could enhance the performance of ABB.

Relationships between Image of Coffee Shops and Brand Loyalty: Mediating Impact of Economic and Noneconomic Satisfaction (커피전문점의 점포이미지와 브랜드 충성도 간의 관계: 경제적 만족과 비경제적 만족의 매개를 중심으로)

  • Choi, Hyung-Min;Eu, Yoon-Sun
    • Journal of the East Asian Society of Dietary Life
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    • v.22 no.5
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    • pp.701-710
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    • 2012
  • The purpose of this study was to classify customer's satisfaction of coffee shops in term of economic and non-economic satisfaction, as well as to examine the effects of coffee shops image on customer's economic and non-economic satisfaction and customer brand loyalty. For this purpose, we collected data from 301 coffee shops, as well as from customers who visited brand name coffee shops in Seoul, Korea. The result of this CFA shows that this study was valid and reliable. Our findings were as follow: (1) Product and accessibility image of coffee shops influenced customer's economic satisfaction, whereas facility and staff image did not. (2) The effects of product, facility, staff and accessibility image on customer's non-economic satisfaction were significant. (3) Coffee shop image was not influenced by brand loyalty. (4) Economic and non-economic satisfaction had a significant impact on brand loyalty.

Relations between Parenting Behaviors, Adolescents' Parent- and Peer Attachment, and Self-esteem by Adolescents' Gender (청소년의 성에 따른 부모의 양육행동, 청소년의 부모애착 및 또래애착과 자아존중감 간의 관계)

  • Kim, Su-Hee;Park, Seong-Yeon
    • Journal of Families and Better Life
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    • v.27 no.5
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    • pp.101-113
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    • 2009
  • The purpose of this study is to examine the relations between parenting behaviors, adolescents' attachment toward parents and peers, and adolescents' self-esteem. The differences in parenting behaviors and adolescents' attachment and self-esteem as a function of parent and adolescent gender are also examined. Participants were 405 high school students (Mage = 16.3, SD = 0.71) who completed questionnaires regarding parenting behavior, parent and peer attachment, and self-esteem. Results show that girls perceived a higher maternal behavioral control and peer attachment, whereas boys perceived a higher parental psychological control. The relative contributions of peer attachment and parenting differed depending on the adolescent's gender. Peer attachment was the only variable to predict boys' self-esteem, but mothers' behavioral control is also important to predict girls' self-esteem. The results underscore the importance of parenting behaviors and adolescents' attachment toward parents and peers in predicting an adolescent's positive self-esteem.

Multi-quantized Image Compression using Wavelet Transform (다중 양자화를 이용한 웨이블릿 영상압축)

  • Piao, Yong-Ri;Kim, Seok-Tae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.3
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    • pp.453-458
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    • 2006
  • This paper proposed the method for restorable lossy mage compression using wavelet transformation. In order to increase compression efficiency, this algorithm subbands with the wavelet transformation filter after processing the pre-quantizer on the original images. Then, it quantizes its wavelet coefficients by using the Huffman Coding. Comparing to the JPEG or non pre-quantized images, the reconstructed images by the proposed algorithm showed higher PSNR. By applying pre-quantizing process, it will be possible to control the peak errors and it is also expected to be useful at mass image compressions.

Efficient Correction of a Rotated Object Using Radon Transform (라돈 변환을 이용한 회전된 물체의 효율적인 보정)

  • Cho, Bo-Ho;Jung, Sung-Hwan
    • Journal of KIISE:Computing Practices and Letters
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    • v.14 no.3
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    • pp.291-295
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    • 2008
  • In this paper, we propose an input image reduction method to solve the problems of Radon transform which is a line structure analysis tool to correct a rotated object through a vision system. First we extract an object image removed background from the input image. Then we also select a reduced object image as a final input mage of Radon transform from the object image by considering slope. Finally we extract a rotated angle by using Radon transform with the final input image and correct the rotated object with the angle. In experimental results, we could improve the process time of about 64%, reduce the memory space of about 18% and make progress the line detection rate of about 18%.

An Extended Concept-based Image Retrieval System : E-COIRS (확장된 개념 기반 이미지 검색 시스템)

  • Kim, Yong-Il;Yang, Jae-Dong;Yang, Hyoung-Jeong
    • Journal of KIISE:Computing Practices and Letters
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    • v.8 no.3
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    • pp.303-317
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    • 2002
  • In this paper, we design and implement E-COIRS enabling users to query with concepts and image features used for further refining the concepts. For example, E-COIRS supports the query "retrieve images containing black home appliance to north of reception set. "The query includes two types of concepts: IS-A and composite. "home appliance"is an IS-A concept, and "reception set" is a composite concept. For evaluating such a query. E-COIRS includes three important components: a visual image indexer, thesauri and a query processor. Each pair of objects in an mage captured by the visual image indexer is converted into a triple. The triple consists of the two object identifiers (oids) and their spatial relationship. All the features of an object is referenced by its old. A composite concept is detected by the triple thesaurus and IS-A concept is recolonized by the fuzzy term thesaurus. The query processor obtains an image set by matching each triple in a user with an inverted file and CS-Tree. To support efficient storage use and fast retrieval on high-dimensional feature vectors, E-COIRS uses Cell-based Signature tree(CS-Tree). E-COIRS is a more advanced content-based image retrieval system than other systems which support only concepts or image features.

Plane-based Computational Integral Imaging Reconstruction Method of Three-Dimensional Images based on Round-type Mapping Model (원형 매핑 모델에 기초한 3차원 영상의 평면기반 컴퓨터 집적 영상 재생 방식)

  • Shin, Dong-Hak;Kim, Nam-Woo;Lee, Joon-Jae;Kim, Eun-Soo
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.11 no.5
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    • pp.991-996
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    • 2007
  • Recently, a computational reconstruction method using an integral imaging technique, which is a promise three-dimensional display technique, has been actively researched. This method is that 3-D images can be digitally reconstructed at the required output planes by superposition of all of the inversely enlarged elemental images by using a hypothetical pinhole array model. However, the conventional method mostly yields reconstructed images having a low-resolution, because there are some intensity irregularities with a grid structure at the reconstructed mage plane by using square-type elemental images. In this paper, to overcome this problem, we propose a novel computational integral imaging reconstruction (CIIR) method using round-type mapping model. Proposed CIIR method can overcome problems of non-uniformly reconstructed images caused from the conventional method and improve the resolution of 3-D images. To show the usefulness of the proposed method, both computational experiment and optical experiment are carried out and their results are presented.