• Proceedings of the Korea Information Processing Society Conference
• /
• 2009.11a
• /
• pp.381-382
• /
• 2009

본 논문은 고령자 및 장애인의 안전한 이동을 지원하기 위한 지능형 휠체어에서의 자동 장애물 감지 및 회피 기술을 개발한다. 이때 다양한 환경에서의 장애물을 정확히 감지하고 회피하기 위하여 학습을 이용한 비전 기반의 경로 선정 방법이 제안 된다. 제안된 시스템은 배경 분류기, occupancy grid map 생성기, 경로 선정기로 구성되며, 경로 선정 시 강건한 장애물 검출을 수행하기 위해 입력 영상을 occupancy grid map으로 변환하고, K-means clustering 알고리즘을 이용하여 생성된 대표 템플릿들과 비교하여 이동 가능한 방향을 선정한다. 제안된 시스템의 효율성을 증명하기 위해 다양한 형태의 장애물을 포함하는 실내 및 실외에서 실험한 결과 81.7%의 정확도를 보였으며, 지능형 휠체어 사용자에게 안전한 이동성을 제공 할 수 있음을 증명 하였다.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2003.11a
• /
• pp.306-308
• /
• 2003

본 논문은 컬러영상내 움직이는 객체의 효과적인 검출을 위해 색상과 위치정보를 적용시킨 K-means 클러스터링 알고리즘을 이용하여 움직이는 객체들을 추출한 방법을 제안하고 있다. 최종 클러스터링된 중심픽셀(prototype)이 갖고있는 RGB 값을 사용해 프레임을 비교해 객체와 배경의 분리를 가능하게 했고 마지막으로 후처리를 이용해 남아있는 배경잡음을 제거하였다. 본 연구의 실험은 여러 교통장면을 포함한 다양한 영상에서 이루어졌으며 실험결과 제안된 알고리즘은 기존의 픽셀이나 블록기반의 방법에 비해 보다 정확한 객체 검출이 가능했으며 한 가지 특징 정보를 사용한 클러스터링에 비해 보다 높은 정확도를 보였다.

• Journal of Multimedia Information System
• /
• v.8 no.1
• /
• pp.11-16
• /
• 2021

This study developed a design to estimate the location of rescue demander using the sound system at disaster site, in the conditions of indoor positioning cannot be performed properly. It is a location tracing system through smart phone application. It generates sound wave information of rescuer at the rescue site, and it can be used as assistant means for indoor location tracing at the disaster site using sound wave receiving measurement technology.

• Proceedings of the IEEK Conference
• /
• 2005.11a
• /
• pp.983-986
• /
• 2005

This paper describes a digital convergence platform(DCP) whice is implemented based on the MPEG-21 multimedia framework. The DCP is a newly proposed solution in this research for the convergence service of future home multimedia environment. The DCP is a common platform designed to have the feature of configurability, via means of S/W, which is needed for the convergence service of diverse digital media. A distributed peer to peer service and transaction model is also a new feature realized in the DCP using the MPEG-21 multimedia framework. A prototype DCP is implemented to verify its functions of multimedia service and transactions. The developed DCPs are networked with IP clustering storage systems for the distributed service of multimedia. Successful streaming services of the MPEG-2/4 video and audio are verified with the implemented test-bed system of the DCP.

• Journal of Korea Multimedia Society
• /
• v.8 no.5
• /
• pp.587-595
• /
• 2005

The vision for MPEG-21 is to define a multimedia framework to enable transparent and augmented use of multimedia resources across a wide range of networks and devices used by different communities MPEG-21 Event Reporting is required within the MPEG-21 Multimedia Framework in order to provide a standardized means for sharing information about Events amongst Peers and Users. There are several Time used in MPEG-21 Event Reporting. In this paper, we analyze and categorize various kinds of Time used in Event Reporting. And we define ERTimeType to be applied for every. Time used in Event Reporting and implement it by XML to support interoperability of standard. The ERTimeType structure we defined is established its objectivity as it is selected to 'ISO/IEC 21000-Part IS: Event Reporting WD 2.0'.

• Journal of Korea Multimedia Society
• /
• v.19 no.7
• /
• pp.1166-1178
• /
• 2016

In Internet of Things (IoT) environments, billions of interconnected devices and multimedia sensors generate a huge amount of multimedia traffic. Since the environment are in general deployed as a server-centric architecture wireless sensor networks could be bottlenecks between IoT gateways and IoT devices. The bottleneck causes high power consumption of the device and triggers very heavy network overload by transmission of sensing data. The deterioration could decrease the quality of multimedia streaming service due to delay, loss, and waste of device power. Thus, in this paper, we propose a context-based adaptive multimedia streaming scheme to support enhanced QoS and low power consumption in IoT environments. The goal of the scheme is to increase quality score per voltage of the streaming service, given an adaptation algorithm with context that are classified network and hardware such as throughput, RTT, and CPU usage. From the both context, the quality score per voltage is used in the comparison of a only network context-based adaptive multimedia streaming scheme, a fixed multimedia streaming and our scheme. As a result, we achieves a high improvement that means the quality score per voltage is increased up to about 4, especially in case of resolution change.

• Journal of Broadcast Engineering
• /
• v.17 no.6
• /
• pp.1014-1028
• /
• 2012

Recently, N-screen service and secondary device have gotten an attention from public. Also, we can experience N-screen service through various digital devices. N-screen means multimedia technology which can seamlessly consume multimedia content. Secondary device means auxiliary multimedia device which can consume content related to main content through adjunct connection to main device. Not only be electronic manufactures interested in N-screen technology and services but also digital devices applied for N-screen have been released. But it has limitation that user can only consume content to be purchased from content company server not device of user. This paper proposes the system that composes effective and various N-screen multimedia service through MPEG-4 LASeR (Lightweight Application Scene Representation) PMSI (Presentation and Modification of Structured Information) as international standard technology which can provide scene description including many instruction for dynamic update of scene.

• Journal of Multimedia Information System
• /
• v.4 no.3
• /
• pp.151-156
• /
• 2017

As Internet services have spread centering on mobiles, diverse services used in everyday life have become mobile services. For humans, residential spaces have significant implications as physical and psychological environments. Therefore, being provided with accurate information on the room that must be sought to find out the residential space wanted by the user can be said to be an important element of real estate apps. However, when buying real estate, people prefer searching for information using mobiles and verifying the information by visiting the real estate firsthand due to increases in damage due to false offerings. This way approaches as inconvenience in cases where the buyer lives far away or if the conditions are not suitable. Therefore, in the present study, a 'room finding application using VR' was designed and implemented using virtual reality (VR) used for diverse purposes. VR is a technology that provides the user with the sense of presence as if the user is actually present in the space. It was used in the present study as a means to provide more accurate information. The use of the application designed and implemented in the present study is expected to reduce false offerings information at least slightly so that users can be provided with more accurate information on the real estate of interest.

• International Journal of Internet, Broadcasting and Communication
• /
• v.8 no.1
• /
• pp.64-68
• /
• 2016

These fields are integrated to visualize and finalize the proposed development, in simulation environment. SCADA (supervisory control and data acquisition) systems and distributed control systems (DCSs) are widely deployed in all over the world, which are designed to control the industrial infrastructures, in real ways. To supervise and control the various parts of designed systems; trends to require a deep knowledge to understand the overall functional needs of industries, which could be a big challenge. Industrial field devices (or network sensors) are usually distributed in many locations and are controlled from centralized site (or main control center); the communication provides various signs of security issues. To handle these issues, the research contribution will twofold: a method using cryptography is deployed in critical systems for security purposes and overall transmission is controlled from main controller site. At controller site, multimedia components are employed to control the overall transmission graphically, such as system communication, bytes flows, security embedded parameters and others, by the means of multimedia technology.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.8 no.5
• /
• pp.1785-1800
• /
• 2014

In 2011, Chen and Wu proposed their method of sharing n secret images to n+1 shadow images through the concept of a Boolean-based Visual Secret Sharing (VSS) method. However, the shadow images produced by this method are not equally important. If the participant who owns an important shadow image does not want to cooperate with other participants, most secret images can not be reconstructed. In the proposed method, the relationship between the shadows images and secret images are designed in a circular way mostly. Each shadow image only relates to two secret images. This means that if one participant refuses to cooperate with other participants, there are only two secret images which can not be reconstructed. Moreover, our proposed method only needs to produce n shadow images and n secret images can be shared to them.