• Journal of Korea Society of Digital Industry and Information Management
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• v.17 no.4
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• pp.1-11
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• 2021

In this paper, we explain the purpose of building a mobile app called "ARnetView" that can use the AR(augmented Reality)based calling function and AR based content creation function, and as well as an AR based data center that can share AR based video streaming and AR based contents on smartphones and tablet devices. For the AR(Augmented Reality) based data center implement, we have developed a mobile application and implemented a service system including an AR(augmented Reality) based calling function and AR based content production and AR based video streaming functions for real-time communication to connect a field technician and an expert so that the expert can see and discuss the situation in the field and technician and experts, they can draw digital annotation on mobile screen that accurately stick to 3D physical objects, allowing the expert to guide the technician step by step. In result, it provides a remote technical collaboration environment between field technician and expert. In addition, AR(Augmented Reality) collaboration service Platform was designed and implemented to increase work speed, efficiency, and utilization of advanced technicians, improve continuous productivity of equipment and facilities, maximize equipment and facility utilization, and strengthen industrial competitiveness. Therefore, through this, the AR collaboration service Platform can be applied to the industrial field, the medical field, and the entertainment/education field.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.5B
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• pp.430-441
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• 2006

As the various A/V devices and home networks are delivered to users, home networks are changing to an entertainment network. It is expected that the required network bandwidth and the amount of usage of media content in home entertainment networks will be increased. Although the access networks and home networks becoming a high speed network, there remains the problems for QoS-guaranteed media content transfer in home networks. Also, in the home network, there can be network traffic caused by applications like video conferencing, video telephone, and VoIP(voice over IP) as well as inner network traffic of home network. Since media content transfer requires the real-time delivery, it is very important and basic requirement that is to transfer media content to A/V device user wants while keeping the media quality. Even though there are many middleware protocol for home networking, they provide basic device discovery and control or simple functions for QoS-guaranteed media content transfer that are not enough to provide QoS-guaranteed media transfer service that user wants. Thus, in this paper, we propose the technique based on UPnP(universal plug and play) protocol for QoS-guaranteed media content transfer in the home network. The proposed technique is compatible with UPnP and can be used with UPnP as additional functions. In this paper, we utilize VideoLAN application to verify the proposed technique. We add the additional modules that support the proposed technique's function to VideoLAN and we verify the its functions through various test scenarios.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11a
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• pp.7-10
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• 2003

근래의 컴퓨터 그래픽스 분야의 중요 목표 중 하나는 동적으로 변화하는 3 차원 가상 공간을 재현해 내는 것이다. 일반적으로 공간정보 취득 기술은 특수한 하드웨어나 환경을 전제로 하는 능동적인 방법과, 특정 환경을 전제하지 않으나 상대적으로 계산 복잡도가 높은 수동적 방법으로 나뉜다. 이 논문에서는 수동적 알고리즘의 계산 복잡도를 개선하여 특수한 환경이나 물리적인 전제 없이 비교적 간단한 하드웨어를 이용하여 정보 취득 후 되도록 짧은 시간(latency)내에 가상 영상을 재구성하는 시스템을 설계 구현한다.

• Journal of the Korea Society of Computer and Information
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• v.21 no.7
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• pp.17-22
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• 2016

In this paper we propose a novel QoE control scheme based on Service Level Agreement (SLA) which enables to guarantee the user perceived service quality of various high-quality mobile multimedia services such as mobile video streaming and real-time network games to a certain level. For this purpose, a SLA control structure is adopted to provision QoE, and a novel resource management scheme gets coupled with this control structure. Simulation results show that our proposed scheme can decrease the average delay and increase the total throughput by adjusting SLA.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2016.11a
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• pp.51-52
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• 2016

최근 360 및 VR(Virtual Reality) 영상의 구성 및 전송을 위해 Facebook이 기존 메르카토르도법을 사용하는 것 대신 "Transform"의 방법을 제시하여 큐브 및 피라미드 형태로의 이미지 전송하는 방식을 발표했다. 본 논문은 이 변형기법을 기반으로, 6개의 카메라로 360VR영상을 촬영할 경우 "Transform"이 가지는 큐브 형태를 이용 기존보다 효과적이고 가벼워 실시간 스트리밍에 적합한 360VR이미지 변형법을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.265-267
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• 2019

본 논문에서는 기존의 실시간 드론 영상 전송 방식의 전송 거리 한계 및 장애물 간섭 문제를 극복하기 위한 LTE 기반 실시간 영상 전송 드론 시스템을 제안하고 구현한다. 원격 LTE 드론 연결 및 영상 전송을 위한 Companion Computer (CC) 구축 및 개발과 유동 IP 를 가진 LTE 모듈의 원활한 연결을 위한 중계서버 구축과 취득한 영상을 통한 객체 탐지 및 추적 기능 개발을 목표로 한다. 개발 및 실험 결과에서는 구현한 LTE 영상전송 시스템을 통해 실시간 영상을 전달받고 GCS 를 통한 드론 조작이 원활하게 동작하는 것을 보여준다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.431-432
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• 2023

본 연구는 초상권을 보호할 수 있는 실시간 영상 모자이크 서비스이다. 실시간 모자이크 서비스에서는 모자이크 처리를 제외하기 위한 이용자 얼굴 등록 기능을 갖고 있다. 이렇게 등록된 얼굴정보는 실시간 영상 스티리밍 서비스에서 모자이크가 되지 않도록 한다. 즉, 모자이크를 원하지 않는 정보를 미리 시스템에 등록하여 실시간 서비스에 어떠한 부분을 모자이크에서 제외 할 것인지 세팅하여 실시간 스트리밍 서비스를 제공한다. 기존 기술과의 차이점은 사람의 얼굴뿐만 아니라 방송에 나오면 안 되는 흉기나 담배 등을 모자이크 처리해 줄 수 있는 기능을 제공하고, 실시간으로 모자이크된 영상 스트리밍 서비스를 제공할 수 있는 장점을 갖는다.

• Proceedings of the Korea Information Processing Society Conference
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• 2024.05a
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• pp.556-558
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• 2024

오늘날 클라우드 컴퓨팅은 FIFA, WTA, F1, MLB등과 같은 비디오 및 실시간 스포츠 이벤트에 널리 사용된다. DataM에 따르면 비디오 스트리밍 플랫폼 시장은 545억 달러에서 2,523달러에 달할 것으로 예측된다. 기존 실시간 스트리밍 방법은 스트리밍 비디오의 개수가 증가하고나 스트리밍 이용자가 증가할 경우 성능 저하 문제가 발생한다. 본 논문에서는 Apache Kafka Server를 활용한 대규모 비디오 스트리밍 기법을 제안한다. Apache Kafka Server를 사용하여 네트워크를 수집하면 대규모 데이터를 처리할 수 있으며, 데이터의 안정성과 실시간 처리를 할 수 있어 온라인 비디오 스트리밍에 적합하다. 이에 비디오 품질을 선택할 때 적합한 비디오 품질을 선택할 수 있다. 향후 제안하는 기법은 많은 데이터와 실험으로 실질적인 검증을 할 예정이다.

• Journal of Broadcast Engineering
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• v.25 no.3
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• pp.305-312
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• 2020

As a demand for a new video coding standard having higher coding efficiency than the existing standards is growing, recently, MPEG and VCEG has been developing and standardizing the next-generation video coding project, named Versatile Video Coding (VVC). Many inter prediction techniques have been introduced to increase the coding efficiency, and among them, an adaptive motion vector resolution (AMVR) technique has contributed on increasing the efficiency of VVC. However, the best motion vector can only be determined by computing many rate-distortion costs, thereby increasing encoding complexity. It is necessary to reduce the complexity for real-time video broadcasting and streaming services, but it is yet an open research topic to reduce the complexity of AMVR. Therefore, in this paper, an efficient technique is proposed, which reduces the encoding complexity of AMVR. For that, the proposed method exploits a special VVC tree structure (i.e., multi-type tree structure) to accelerate the decision process of AMVR. Experiment results show that the proposed decision method reduces the encoding complexity of VVC test model by 10% with a negligible loss of coding efficiency.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.8C
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• pp.777-785
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• 2006

H.264 is the prominent video coding standard in various applications such as real-time video streaming and digital multimedia broadcasting, since it provides enhanced compression performance, error resilience tools, and network adaptation. Since compressed video stream is vulnerable to packet loss, error resilience and error concealment(EC) tools are essential for the transmission of video over the Internet. In this paper, we first propose a simple temporal EC method that improves the EC performance for intra-frame in H.264 when the amount of motion is relatively small. Then we propose a new hybrid EC method for intra-frame in H.264, which combines the spatial EC and temporal EC adaptively. The simulations are performed in packet-lossy environments, and the proposed hybrid EC method shows about 0.5-4dB PSNR improvement compared to the conventional spatial EC method that is used for intra-frame in H.264.