• Title/Summary/Keyword: 정보스캐닝

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Performance Enhancement through Row-Column Cross Scanning in Differential Histogram-based Reversible Watermarking (차이값 히스토그램 기반 가역 워터마킹의 행열 교차 스캐닝을 통한 성능 향상 기법)

  • Yeo, Dong-Gyu;Lee, Hae-Yeoun;Kim, Byeong-Man
    • The KIPS Transactions:PartB
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    • v.18B no.1
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    • pp.1-10
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    • 2011
  • Reversible watermarking inserts watermark into digital media in such a way that visual transparency is preserved, which enables the restoration of the original media from the watermarked one without any loss of media quality. It has various applications, where high capacity and high visual quality are major requirements. This paper presents a new effective multi-round embedding scheme for the differential histogram-based reversible watermarking that satisfies high capacity requirements of the application. The proposed technique exploits the row-column cross scanning to fully utilize the locality of images when multi-round embedding phase to the message inserted image. Through experiments using multiple kinds of test images, we prove that the presented algorithm provides 100% reversibility, effectiveness of multi-round embedding, and higher visual quality, while maintaining the induced-distortion low.

Adaptive Convolution Filter-Based 3D Plane Reconstruction for Low-Power LiDAR Sensor Systems (저전력 LiDAR 시스템을 위한 Adaptive Convolution Filter에 기반한 3D 공간 구성)

  • Chong, Taewon;Park, Daejin
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.25 no.10
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    • pp.1416-1426
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    • 2021
  • In the case of a scanning type multi-channel LiDAR sensor, the distance error called a walk error may occur due to a difference in received signal power. This work error causes different distance values to be output for the same object when scanning the surrounding environment based on multiple LiDAR sensors. For minimizing walk error in overlapping regions when scanning all directions using multiple sensors, to calibrate distance for each channels using convolution on external system. Four sensors were placed in the center of 6×6 m environment and scanned around. As a result of applying the proposed filtering method, the distance error could be improved by about 68% from average of 0.5125 m to 0.16 m, and the standard deviation could be improved by about 48% from average of 0.0591 to 0.030675.

Digital Image Processing Technique for Measurements from Non-metric Photographs (비측정용 사진의 측정을 위한 수치화상처리기법의 적용)

  • 안기원;박병욱
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.13 no.2
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    • pp.199-208
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    • 1995
  • Significant developments in the use of digital imagery for close-range photogrammetric metrology have occured in the last few years because of technological advances in digital image processing. Present day needs for applications of digital image processing technique to measurements of photographs obtained with non-metric camera at reduced cost, automation and convenience. In order for this application to be useful, a detailed procedure must be developed. Investigation of this study is given to the detailed procedure for the digital measurements of the object space data from the scanned non-metric photographs.

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Auto-focus of Optical Scanning Holographic Microscopy Using Partial Region Analysis (광 스캐닝 홀로그램 현미경에서 부분 영역 해석을 통한 자동 초점)

  • Kim, You-Seok;Kim, Tae-Geun
    • Korean Journal of Optics and Photonics
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    • v.22 no.1
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    • pp.10-15
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    • 2011
  • In this paper, we propose an auto-focusing algorithm which extracts a depth parameter by analyzing a selected part of a hologram, and we use experimental results to show that the algorithm is practical. First, we record a complex hologram using Optical Scanning Holography. Next we select some part of hologram and extract depth information through Gaussian low pass filtering, synthesizing a real-only hologram, power fringe-adjusted filtering and inverting to a new frequency axis. Finally, we reconstruct the hologram automatically using the extracted depth location.

오피니언-정보하시대 인쇄업계의 대응 방향

  • Kim, Won-Je
    • 프린팅코리아
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    • s.5
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    • pp.86-91
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    • 2002
  • 디지털 인쇄 테크놀로지가 소비자와 인쇄업계의 관계를 바꾸어 놓았다. 1960년대 시작된 컴퓨터 조판, 1970년대 중반 컬러 스캐닝 혁명을 거쳐 오늘날 완벽한 컬러를 구현하는 DTP, 그래픽 기술들은 급격한 변화의 흐름 속에 있다. 이러한 변화는 강화될 것으로 보인다. 스캐너, 디지털카메라 등 이미지 획득 장비의 값이 급격히 하락하고 이미지 구현 소프트웨어의 구입과 작동 비용이 감소하면서 프린터 업자들이 갖고 있었던 파워가 출판업자, 에이전시, 디자이너, 기업의 디자인 부서 등 창조적 존재들에게로 이전되었다.

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Measurement of Joint-Orientation and Monitoring of Displacement in Tunnel using 3D Laser Scanning System (3차원 레이저 스캐닝 시스템을 이용한 불연속면의 방향성 측정과 터널 변위 모니터링)

  • Shon, Ho-Woong;Oh, Seok-Hoon;Kim, Young-Kyung
    • Journal of the Korean Geophysical Society
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    • v.9 no.1
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    • pp.47-62
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    • 2006
  • More than 70% of Korean Peninsula is consisted of mountains, so that lots of roads, rail-roads and tunnel,which play a pivotal role in the industry activity, are existed along the rock-slope and in the rock-mass. Thus,it is urgent that tegration of management system through the optimum survey and design of rock-slope excavation, proper stabilization method and database of rock-slope. However, conventional methods have shortcoming with the economy of survey time and human resources, and the overcome of difficulties of approach to the in-situ rock-slope. To overcome the limitation of conventional method, this paper proposed the development of remote measurement system using Terrestrial Laser Scanning System. The method using Terrestrial 3D Laser Scanning System, which can get 3D spatial information on the rock-slope and2)Dept. Geosystem Engineering, Kangwon National University, Korea tunnel, has an advantage of reduction of measurement time and the overcome of difficulties of approach to the in-situ rock-slope/dam/tunnel. In the case of rock-slope, through the analysis of 3D modeling of point-cloud by Terrestrial Laser Scanning System, orientation of discontinuity, roughness of joint surface, failure shape and volume were successively achieved. in the case of tunnel face, through reverse-engineering, monitoring of displacement was possible.

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Significance of Three-Dimensional Digital Documentation and Establishment of Monitoring Basic Data for the Sacred Bell of Great King Seongdeok (성덕대왕신종의 3차원 디지털 기록화 의미와 모니터링 기초자료 구축)

  • Jo, Younghoon;Song, Hyeongrok;Lee, Sungeun
    • Conservation Science in Museum
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    • v.24
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    • pp.55-74
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    • 2020
  • The Sacred Bell of Great King Seongdeok is required digital precision recording of conservation conditions because of corrosion and partial abrasion of its patterns and inscriptions. Therefore, this study performed digital documentation of the bell using four types of scanning and unmanned aerial vehicle (UAV) photogrammetry technologies, and performed the various shape analyses through image processing. The modeling results of terrestrial laser scanning and UAV photogrammetry were merged and utilized as basic material for monitoring earthquake-induced structural deformation because these techniques can construct mutual spatial relationships between the bell and its tower. Additionally, precision scanning at a resolution four to nine times higher than that of the previous study provided highly valuable information, making it possible to visualize the patterns and inscriptions of the bell. Moreover, they are well-suited as basic data for identifying surface conservation conditions. To actively apply three-dimensional scanning results to the conservation of the original bell, the time and position of any changes in shape need to be established by further scans in the short-term. If no change in shape is detected by short-term monitoring, the monitoring should continue in medium- and long-term intervals.

Multiple fixed implant-supported prosthesis using temporary denture and scannable healing abutment: a case report (임시의치와 스캔가능한 치유지대주를 이용한 고정성 임플란트 보철 수복 증례)

  • Hyung-Jun Kim;Hyeon Kim;Woo-hyung Jang;Kwi-dug Yun;Sang-Won Park;Hyun-Pil Lim
    • Journal of Dental Rehabilitation and Applied Science
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    • v.39 no.4
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    • pp.250-259
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    • 2023
  • The use of digital technology in fixed prosthetic treatment using implants enables predictive treatment through diagnosis and virtual surgery by integrating clinical and radiological information of patients. Existing digital scanning methods require several components to be removed, such as removing the healing abutment and connecting the scan body. In the scannable healing abutment developed in consideration of this point, scanning is performed directly on the healing abutment, maintaining soft tissue sealing and simplifying scanning. Digital technology can also be used when obtaining the intermaxillary relationship. Recently, various digital technologies have been reported to acquire the intermaxillary relationship of edentulous patients using surgical guides, patient-specific scanning devices, or scans of the inside of temporary dentures. In this case, the implant-supported fixed prosthesis treatment was performed through scanning the scannable healing abutment and the inner side of the temporary denture to obtain the intermaxillary relationship, thereby simplifying the treatment process and obtaining aesthetically and functionally excellent clinical results.

A Study on the Generation of Basic Modeling 3D Data for Product Design (제품디자인 기초모델링 3D데이터 생성에 관한 연구)

  • Lee, Junsang;Park, Junhong
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2018.10a
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    • pp.652-654
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    • 2018
  • The process of generating basic modeling data in product design and production design is very important and it takes a lot of time to produce. To overcome these shortcomings, 3D scanning technology is emerging that can easily acquire modeling data. In this paper, we propose a technique to convert the image data from the image data to the modeling data after shooting the objects in the space, and generate the basic modeling data applicable to the product design. It also suggests ways to redirect and utilize the basic modeling data of the product.

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An Efficient Algorithm for Mining Ranged Association Rules (영역 연관규칙 탐사를 위한 효율적 알고리즘)

  • 조일래
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.1 no.2
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    • pp.169-181
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    • 1997
  • Some association rules can have very high confidence in a sub-interval or a subrange of the domain, though not quite high confidence in the whole domain. In this paper, we define a ranged association rule, an association with high confidence worthy of special attention in a sub-domain, and further propose an efficient algorithm which finds out ranged association rules. The proposed algorithm is data-driven method in a sense that hypothetical subranges are built based on data distribution itself. In addition, to avoid redundant database scanning, we devise an effective in-memory data structure, that is collected through single database scanning. The simulation shows that the suggested algorithm has reliable performance at the acceptable time cost in actual application areas.

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