• 한국주거학회논문집
• /
• 제20권5호
• /
• pp.9-21
• /
• 2009

This study classified visual perception types of access space at 17 five-star hotels in Jejudo and examined their cognitive characteristics and image formation structures in an effort to provide basic information important for designing the elevation and the access spaces of a hotel. The results of this study are as follows. Access space image of experimental hotels showed more negative evaluations at both city hotels and resort hotels, viewing angle (upward angle) was also positively evaluated between $10^{\circ}{\sim}12^{\circ}$ and $18^{\circ}$ and central type in arrangement type and detour access and straight access types in access circulation type were positively evaluated. When viewed from an upward angle of $10^{\circ}$ to $12^{\circ}$, the most important factors were as plasticity, decorativeness, and creativity; from $18^{\circ}$ it was such factors as harmony and peculiarity; and at $45^{\circ}$ it was factors like decorativeness and stability. In considering the various access types, the most important factors in a straight access type were peculiarity and harmony; for one-time curved access type it was by decorativeness, creativity, Peculiarity, and stability; and for detour access types it was decorativeness, stability, and peculiarity. Influential of factors affecting image formation and plasticity and harmony factors and the form had more influences on image formation.

• Journal of Information Processing Systems
• /
• 제14권5호
• /
• pp.1150-1166
• /
• 2018

This paper presents a physical storage design method for image access structures using transformation techniques of multidimensional file organizations in image information systems. Physical storage design is the process of determining the access structures to provide optimal query processing performance for a given set of queries. So far, there has been no such attempt in the image information system. We first show that the number of pages to be accessed decreases as the shape of the given retrieval query region and that of the data page region become similar in the transformed domain space. Using these properties, we propose a method for finding an optimal image access structure by controlling the shapes of the page regions. For the performance evaluation, we have performed many experiments with a multidimensional file organization using transformation techniques. The results indicate that our proposed method is at least one to maximum five times faster than the conventional method according to the query pattern within the scope of the experiments. The result confirms that the proposed physical storage design method is useful in a practical way.

• 한국멀티미디어학회논문지
• /
• 제24권6호
• /
• pp.825-837
• /
• 2021

The Bluetooth Low Energy profile has the advantage of continuing wireless communication with very little power consumption compared to the existing Bluetooth, so it is widely applied to smart devices. Most of them are applied to Point-to-Point (1:1) communication between Central (Master) and Peripheral (Slave), but can be applied to Point-to-Multiple (1:N) wireless communication through the use of multiple threads and timers. Therefore, in this paper, a precise timer was designed in the BLE profile to devise an image segmentation transmission/reception structure based on multiple access, and a smart image block device applied to it was designed and verified.

• 한국안전학회지
• /
• 제12권3호
• /
• pp.60-66
• /
• 1997

In this paper, a moving object surveillance system, which can extract moving object in real-time, using image subtraction method is described. This technique based on the novelty filter having the structure of neural network associative memory. Digital arithmetic and timing control parts were composed of hardwired controller to treat two-dimensional massive image information. SRAMS having 20 ns access time were used for the image buffer that has high speed write/read property. Image extraction algorithm is discussed and supported by simulation and experiments.

• 한국산학기술학회논문지
• /
• 제17권11호
• /
• pp.20-25
• /
• 2016

본 논문에서는 고해상도 영상의 효과적인 처리를 위한 블록 버퍼 기반의 저 복잡도 무손실 프레임 메모리 (frame memory) 압축 방법을 제안한다. 제안하는 압축 방법은 공간적 상관도를 제거하기 위하여 블록단위 MHT (modified Hadamard transform)를 사용하고, 엔트로피 부호화를 위하여 AGR (adaptive Golomb-Rice) 부호화 기법을 적용하여 저 복잡도 무손실 압축 및 효과적인 하드웨어 구현을 달성한다. MHT는 가산기와 1비트 오른쪽 시프트(1-bit right shift) 연산만으로 구성되어 있고, AGR은 별도의 메모리 공간 및 메모리 접근 동작(memory access operation)을 포함하지 않아 저 복잡도 구현이 용이하다. 기존의 저 복잡도 무손실 압축 방법과 비교하여 제안한 알고리즘은 압축률 측면에서 우수한 성능을 나타내고, 기존 코덱(codec)의 구조를 크게 수정하지 않으면서 화질의 열화없이 하드웨어 장치에 적용될 수 있음을 다양한 영상에 대한 실험 및 복잡도 분석을 통해 보인다. 또한 제안한 방법은 메모리 접근 동작을 필요로 하지 않아 하드웨어 구현을 위한 비용을 최소화 할 수 있어, Fill HD급 이상의 고해상도 영상을 효과적으로 처리하는데 유용하다.

• 전자공학회논문지
• /
• 제53권6호
• /
• pp.91-100
• /
• 2016

FPGA 기반 실시간 영상 워핑 시스템에서는 영상 픽셀 정보의 빠른 읽기와 메모리 접근 횟수의 감소를 위하여 영상 캐시를 활용하지만, 일반 컴퓨터 시스템의 캐시 알고리즘은 캐시 부적중(cache miss)에 의한 시간 지연과 복잡한 온라인(on-line) 연산 구조로 인하여 실시간 성능 구현에 어려움이 있다. 본 논문에서는 FPGA 기반 실시간 영상 워핑을 위한 단순한 구조의 영상 캐시 알고리즘을 제안한다. 영상 워핑에서의 픽셀 데이터 접근 순서는 워핑에 적용할 2D 좌표변환 관계에 의하여 결정되며 매 영상 프레임에서 반복되는 특성이 있다. 따라서, 캐시 로드(cache load)에 관한 사항을 오프라인(off-line)에서 미리 프로그램함으로써 캐시 부적중 상황이 발생하지 않음을 보장할 수 있고, 그 결과 온라인에서의 연산이 감소하여 캐시 컨트롤러의 구조가 단순해진다. FPGA를 활용한 전체 시스템 구조를 제시하고, 실험을 통하여 제안하는 영상 캐시 알고리즘의 정확성과 타당성을 확인한다.

• 한국정보처리학회논문지
• /
• 제7권2S호
• /
• pp.678-691
• /
• 2000

A variety of multimedia applications require multimedia database management systems to manage multimedia data, such as text, image, and video, as well as t support content-based image or video retrieval. In this paper we design and implement a content-based image retrieval system, BADA-IV/I$^2$R(Image Information Retrieval), which is developed based on BADA-IV multimedia database management system. In this system image databases can be efficiently constructed and retrieved with the visual features, such as color, shape, and texture, of image. we extend SQL statements to define image query based on both annotations and visual features of image together. A high-dimensional index structure, called CIR-tree, is also employed in the system to provide an efficient access method to image databases. We show that BADA-IV/I$^2$R provides a flexible way to define query for image retrieval and retrieves image data fast and effectively: the effectiveness and performance of image retrieval are shown by BEP(Bull's Eye Performance) that is used to measure the retrieval effectiveness in MPEG-7 and comparing the performance of CIR-tree with those of X-tree and TV-tree, respectively.

• 한국문헌정보학회지
• /
• 제49권4호
• /
• pp.99-124
• /
• 2015

As the improvement of digital technologies increases the use of images from various fields, the domain of image retrieval has evolved and become a growing topic of research in the Library and Information Science field. The purpose of this study is to identify the knowledge structure of the image retrieval domain by using the author co-citation analysis and author bibliographic coupling as analytical tools in order to understand the domain's past and present. The data set for this study is 245 articles with 8,031 cited articles in the field of image retrieval from 1998 to 2013, from the Web of Science citation database. According to the results of author co-citation analysis for the past of the image retrieval domain, our findings demonstrate that the intellectual structure of image retrieval in the LIS field consists of predominantly user-oriented approaches, but also includes some areas influenced by the CBIR area. More specifically, the user-oriented approach contains six specific areas which include image needs, information seeking, image needs and search behavior, image indexing and access, indexing of image collection, and web image search. On the other hand, for CBIR approaches, it contains feature-based image indexing, shape-based indexing, and IR & CBIR. The recent trends of image retrieval based on the results from author bibliographic coupling analysis show that the domain is expanding to emerging areas of medical images, multimedia, ontology- and tag-based indexing which thus reflects a new paradigm of information environment.

• 펄프종이기술
• /
• 제39권4호
• /
• pp.1-6
• /
• 2007

Paper is a composite consisted of various solid materials including pulp, filler and other additives. The pore is also one of components consisting the paper structure. Thus the characterization of pore structure of paper is very helpful in the understanding the structural properties of paper. Mercury intrusion technique is frequently used for the characterization of the porous paper, giving access to parameters such as pore size and pore distribution. But some researchers pointed out the problem that the distortion of the pore structure can be occurred by the application of high pressure during mercury intrusion. Thus in this study, we tried to evaluate the potential of SEM and image analysis method as means for analyzing pore structure of the paper. The new pore analysis technique with SEM and image analysis does not require the application of high pressure, and gave better relation between the measured pore characteristics and the bulk of sheet than mercury intrusion method.

• 대한임베디드공학회논문지
• /
• 제9권6호
• /
• pp.335-344
• /
• 2014

As a kind of 2D spatial coordinate transform, image warping is a basic image processing technique utilized in various applications. Though image warping algorithm is composed of relatively simple operations such as memory accesses and computations of weighted average, real-time implementations on embedded vision systems suffer from limited computational power because the simple operations are iterated as many times as the number of pixels. This paper presents a real-time implementation of a look-up table(LUT)-based image warping using an FPGA. In order to ensure sufficient data transfer rate from memories storing mapping LUT and image data, appropriate memory devices are selected by analyzing memory access patterns in an LUT-based image warping using backward mapping. In addition, hardware structure of a parallel and pipelined architecture is proposed for fast computation of bilinear interpolation using fixed-point operations. Accuracy of the implemented hardware is verified using a synthesized test image, and an application to real-time lens distortion correction is exemplified.