• 제어로봇시스템학회논문지
• /
• 제18권5호
• /
• pp.479-486
• /
• 2012

In this paper, a ranging system is proposed that is able to measure 360 degree omnidirectional distances to environment objects. The ranging system is based on the structured light imaging system with catadioptric omnidirectional mirror. In order to make the ranging system robust against environmental illumination, efficient structured light image processing algorithms are developed; sequential integration of difference images with modulated structured light and radial search based on Bresenham line drawing algorithm. A dedicated FPGA image processor is developed to speed up the overall image processing. Also the distance equation is derived in the omnidirectional imaging system with a hyperbolic mirror. It is expected that the omnidirectional ranging system is useful for mapping and localization of mobile robot. Experiments are carried out to verify the performance of the proposed ranging system.

• 한국지능시스템학회논문지
• /
• 제22권3호
• /
• pp.341-346
• /
• 2012

초음파 영상 진단이 보편화되지 않은 재활 분야의 경우 초음파 영상에서 얻어지는 결과들이 전문의의 숙달 정도에 따라 주관적인 경향을 띄게 된다. 정확한 진단을 위해서는 객관적인 영상 분석이 필요하며, 정확한 자료 도출을 위한 자동화가 필요한 실정이다. 기존의 근골격계 검사에 사용되는 초음파 영상 분석의 자동화를 위해 제시된 방법은 영상에 존재하는 근막의 형태가 희미할 경우에는 정확한 근육 영역이 확보되지 않는 단점이 있다. 따라서 본 논문에서는 초음파 영상 분석을 통한 객관적인 자료 도출을 위해 복부 초음파 영상에 존재하는 근육 영역 추출의 정확성을 높일 수 있는 방법을 제안한다. 근육 영역의 추출 과정은 초기 초음파 영상의 불필요한 잡음을 제거하고, Ends-in Search 알고리즘을 적용하여 근막과 근육 영역의 명암대비를 강조한다. 전처리를 통하여 근육과 근막 영역을 강조한 초음파 영상에 Up_Down 탐색 기법을 적용하여 초기 근육 영역을 추출하고, 기존의 방법에서 근막 영역이 희미하여 정확하게 도출되지 않았던 근육 영역을 추출하기 위해 초기 추출된 근막의 형태 정보와 방향 정보를 기반으로 하는 마스크를 이용하여 희미한 근막을 추적한다. 마스크가 이동한 흔적을 이용하여 근막의 형태를 강조하고, 최종적으로 근육 영역을 추출한다. 제안된 방법을 재활 분야에서 실제 사용되는 Convex 형태의 초음파 영상을 대상으로 실험한 결과, 기존의 근육 추출 방식보다 근육 정보를 정확하게 분석할 수 있고 근육 추출에 효과적인 것을 확인할 수 있었다.

• 융합정보논문지
• /
• 제9권9호
• /
• pp.20-26
• /
• 2019

ICT 기술의 발전과 스마트폰 보급의 활성화로 온라인 마켓을 통해 다양한 제품을 구매하는 구매 서비스가 활성화되고 있다. 특히 보관 및 배송 기술의 발전으로 인하여 보관기관이 짧은 식자재의 경우도 온라인을 통해 구매가 가능함으로써 오프라인 판매만을 수행하는 상가의 경우 매출이 감소되고 있는 추세이다. 따라서 본 논문에서는 기존 오프라인 판매만 수행이 가능한 소규모 상가에서 전문적인 판매 지식 및 판매망이 없어도 구매 서비스를 통해 광고 효과 및 주문, 배달이 가능한 통합 솔루션을 제안한다. 제안하는 시스템은 사용자가 원하는 제품에 대한 이미지 검색을 통해 효율적으로 제품에 대한 정보를 카테고리별로 볼 수 있으며, 이로 인해 등록된 제품 판매처가 추가적인 광고가 없어도 효율적으로 판매가 가능하다는 장점이 있다.

• 한국컴퓨터정보학회논문지
• /
• 제24권1호
• /
• pp.57-65
• /
• 2019

In this paper, we propose a Rights Management Information(RMI) expression systems for individual sites are integrated and the performance evaluation is performed to find out an efficient comparing and updating method of RMI through various image feature point search techniques. In addition, we proposed a weighted scoring model for both public domain sites and posts in order to use the most latest RMI based on reliable data. To solve problem that most public domain sites are exposed to copyright infringement by providing inconsistent RMI(Rights Management Information) expression system and non-up-to-date RMI information. The weighted scoring model proposed in this paper makes it possible to use the latest RMI for duplicated images that have been verified through the performance evaluation experiments of SIFT and CNN techniques and to improve the accuracy when applied to search engines. In addition, there is an advantage in providing users with accurate original public domain images and their RMI from the search engine even when some modified public domain images are searched by users.

• 반도체디스플레이기술학회지
• /
• 제14권2호
• /
• pp.53-59
• /
• 2015

Since the amount of digital image continues to grow in usage, users feel increased difficulty in finding specific images from the image collection. This paper proposes a novel image searching scheme that extracts the image feature using combination of Advanced SURF (Speed-Up Robust Feature) and DCD (Dominant Color Descriptor). The key point of this research is to provide a new feature extraction algorithm to improve the existing SURF method with removal of unnecessary feature in image retrieval, which can be adaptable to mobile system and efficiently run on the mobile environments. To evaluate the proposed scheme, we assessed the performance of simulation in term of average precision and F-score on two databases, commonly used in the field of image retrieval. The experimental results revealed that the proposed algorithm exhibited a significant improvement of over 14.4% in retrieval effectiveness, compared to OpenSURF. The main contribution of this paper is that the proposed approach achieves high accuracy and stability by using ASURF and DCD in searching for natural image on mobile platform.

• 한국멀티미디어학회논문지
• /
• 제25권1호
• /
• pp.135-143
• /
• 2022

In order to convert Korean folk paintings called Minhwa, a part of traditional Korean heritage, into DBs, it is necessary to design a classification system suitable for the characteristics of folk paintings. A classification system and the generating of unique codes are required to classify and save them. To realize this, a basic classification system was created by listing objects depicted in folk paintings, and keywords were extracted by reclassifying them for each object. In order to assign a unique code to each piece, we organize the English names of each Minhwa since the English names of the folk painting contain the names of objects. The code name is extracted by applying the order of nouns and consonant priority rules in English names and attaching five Arabic numerals. These codes are later assigned to each image file stored in the database and are input together with the keyword. The Minhwa DB constructed in this way enables storage and search centered on objects and keywords and the intuitive inferring of the type of object from the code name.

• 한국광학회:학술대회논문집
• /
• 한국광학회 1990년도 제5회 파동 및 레이저 학술발표회 5th Conference on Waves and lasers 논문집 - 한국광학회
• /
• pp.82-86
• /
• 1990

A camera type optical bench system equipped with a lens collimator and an image analyzer is fabricated to measure the equivalent focal length and distortion of lenses. This system is automatized by the computer which controls stepping motors. A nodal slide optical bench system equipped with an off axis reflective collimator is fabricated and improved by using rotating arms and air bearing system. distortion measurement on a wide angle lens using the camera method and the nodal slide method is reported. Defocusing error in the distortion measurement with the nodal slide optical bench is analyzed and improved by iteration method to search the correct image point.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제8권1호
• /
• pp.213-231
• /
• 2014

Existing image search systems allow users to search images by keywords, or by example images through content-based image retrieval (CBIR). On the other hand, users might learn more relevant textual information about an image from its text captions or surrounding contexts within documents or Web pages. Without such contexts, it's difficult to extract semantic description directly from the image content. In this paper, we propose an annotation watermarking system for users to embed text descriptions, and retrieve more relevant textual information from similar images. First, tags associated with an image are converted by two-dimensional code and embedded into the image by discrete wavelet transform (DWT). Next, for images without annotations, similar images can be obtained by CBIR techniques and embedded annotations can be extracted. Specifically, we use global features such as color ratios and dominant sub-image colors for preliminary filtering. Then, local features such as Scale-Invariant Feature Transform (SIFT) descriptors are extracted for similarity matching. This design can achieve good effectiveness with reasonable processing time in practical systems. Our experimental results showed good accuracy in retrieving similar images and extracting relevant tags from similar images.

• 한국멀티미디어학회논문지
• /
• 제17권12호
• /
• pp.1521-1527
• /
• 2014

This paper presents to design User eXperience(UX) of anthropomorphic animal characters search system (hereinafter, AACSS) for efficient user search. To this end, meta data were utilized herein to elevate the search efficiency of multimedia information and text information. Anthropomorphic animal characters require the human elements and the animal elements, thus this paper extracted the key elements of meta data as below; phenotypic element in animal system classification (Morphologic property elements, Ecological property elements, Behavioral property elements), emotion classification, which is the trait of personification and the Step of Anthropomorphic Animal Characters.

• Spatial Information Research
• /
• 제5권2호
• /
• pp.195-198
• /
• 1997

WEB기반의 환경 GIS자료 관리를 위해 JVM, JDBC, Oracle DB을 이용한다. 본 논문에서의 다루는 환경 GIS자료에는 위성, 주제도, GIS자료 등이 있으며, 이 자료는 공간 정보와 속성 정보를 가지고 DB에 존재한다. 자료의 검색은 WEB Broswer의 조회용 지도를 이용한 공간 검색과 비공간 속성 정보에 의한 검색 기능을 제공한다. 자료 등록은 WEB Broswer에서 자료 등록 시스템을 이용한다.