• 제목/요약/키워드: 윈도우 프레임

검색결과 112건 처리시간 0.028초

Implementation and Performance analysis of a Framework to Support Real-Time of Robot Components (로봇 컴포넌트에 실시간성을 지원하기 위한 프레임워크 구현 및 성능분석)

  • Choi, Chan-Woo;Cho, Moon-Haeng;Park, Seong-Jong;Lee, Cheol-Hoon
    • The Journal of the Korea Contents Association
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    • 제9권4호
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    • pp.81-94
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    • 2009
  • In ubiquitous environments, the real-time features are necessary to insure the QoS of the intelligent service robots. In this paper, we design and implement a real-time framework for intelligent service robots to support real-time features. The real-time framework to support real-time scheduling services is implemented on the general operating systems. We solve the problem that the scheduler of a general operating system can not support real-time features. This paper also proposes realtime scheduling services to guarantee the QoS of real-time robot applications. We implemented the proposed real-time framework on the Windows operating system and conducted some performance experiments. The experimental results show that the proposed real-time framework can improve thread response times and it has slight performance overhead of $62{\mu}s$.

Vehicle Speed Measurement using SAD Algorithm (SAD 알고리즘을 이용한 차량 속도 측정)

  • Park, Seong-Il;Moon, Jong-Dae;Ko, Young-Hyuk
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • 제14권5호
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    • pp.73-79
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    • 2014
  • In this paper, we proposed the mechanism which can measure traffic flow and vehicle speed on the highway as well as road by using the video and image processing to detect and track cars in a video sequence. The proposed mechanism uses the first few frames of the video stream to estimate the background image. The visual tracking system is a simple algorithm based on the sum of absolute frame difference. It subtracts the background from each video frame to produce foreground images. By thresholding and performing morphological closing on each foreground image, the proposed mechanism produces binary feature images, which are shown in the threshold window. By measuring the distance between the "first white line" mark and the "second white line"mark proceeding, it is possible to find the car's position. Average velocity is defined as the change in position of an object divided by the time over which the change takes place. The results of proposed mechanism agree well with the measured data, and view the results in real time.

Implementation of a Real-Time Spatio-Temporal Noise Reduction System (실시간 시공 노이즈 제거 시스템 구현)

  • Hong, Hye-Jeong;Kim, Hyun-Jin;Kang, Sung-Ho
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • 제45권2호
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    • pp.74-80
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    • 2008
  • Spatio-temporal filters are capable of reducing noise from moving pictures, which cannot be dealt with by spatial filters. However, the algorithm is too complicated to be realized as hardware. We implemented a real-time spatio-temporal noise reduction system, using at most three frames, based upon adaptive mean filter algorithm. Some factors which interfere with hardware implementation were modified. Noise estimated from the previous frame was used to filter the current frame so that filtering could be conducted in parallel with noise estimation. This speeds up the system thereby enabling real-time execution. The form of filtering windows was also modified to facilitate synchronization. The proposed structure was implemented on Virtex 4 XC4VLX60, occupying 66% of total slices with 80MHz of the maximum operation frequency.

Implementation of Web Based Video Learning Evaluation System Using User Profiles (사용자 프로파일을 이용한 웹 기반 비디오 학습 평가 시스템의 구현)

  • Shin Seong-Yoon;Kang Il-Ko;Lee Yang-Won
    • Journal of the Korea Society of Computer and Information
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    • 제10권6호
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    • pp.137-152
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    • 2005
  • In this Paper, we Propose an efficient web-based video learning evaluation system that is tailored to individual student's characteristics through the use of user profile-based information filtering. As a means of giving video-based questions, keyframes are extracted based on the location, size, and color information, and question-making intervals are extracted by means of differences in gray-level histograms as well as time windows. In addition, through a combination of the category-based system and the keyword-based system, questions for examination are given in order to ensure efficient evaluation. Therefore, students can enhance school achievement by making up for weak areas while continuing to identify their areas of interest.

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Video Transmission Method for Constant Video Quality in Next-Generation Wireless Networks (차세대 이동망에서 영상 품질을 보장하기 위한 전송 방법)

  • Park, Sang-Hyun
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 한국해양정보통신학회 2007년도 춘계종합학술대회
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    • pp.175-178
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    • 2007
  • According to recently presented QoS architecture by 3GPP, a traffic conditioner may be deployed to provide conformance of the negotiated QoS. A real-time frame-layer rate control method which can be applied to the traffic conditioner is proposed. The proposed rate control method uses a non-iterative optimization method for low computational complexity, and performs bit allocation at the frame level to minimize the average distortion over an entire sequence as well as variations in distortion between frames. The proposed algorithm does not produce time delay from encoding, and is suitable for real-time low-complexity video encoder.

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Video Quality Variation Minimizing for Real-Time Low Bit Rate Video (영상품질 변화를 최소화하는 실시간 저전송률 영상코딩)

  • Park, Sang-Hyun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • 제11권5호
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    • pp.868-874
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    • 2007
  • A real-time frame-layer rate control algorithm with a token bucket traffic shaper is proposed for minimizing video duality variation. The proposed rate control method uses a non-iterative optimization method for low computational complexity, and performs bit allocation at the frame level to minimize variation in distortion between frames. In order to reduce the quality fluctuation, we use a sliding window scheme which does not require the pre-analysis process. Therefore, the proposed algorithm does not produce the delay from encoding, and is suitable for real-time low-complexity video encoder. Experimental results indicate that the proposed control method provides better PSNR performance than the existing rate control method.

A Window-Based DVS Algorithm for MPEG Player (MPEG 동영상 재생기를 위한 윈도우 기반 동적 전압조절 알고리즘)

  • Seo, Young-Sun;Park, Kyung-Hwan;Baek, Yong-Gyu;Cho, Jin-Sung
    • Journal of KIISE:Computer Systems and Theory
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    • 제35권11호
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    • pp.517-526
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    • 2008
  • As the functionality of portable devices arc being enhanced and the performance is being greatly improved, power dissipations of battery driven portable devices are being increased. So, an efficient power management for reducing their power consumption is needed. In this paper, we propose a window-based DVS algorithm for MPEG Player. The proposed algorithm maintains the recently frame information and execution time received from MPEG player in window queue and dynamically adjusts (frequency, voltage) level based on window queue information. Our algorithm can be implemented in the common multimedia player as a module. We employed well-known MPlayer for the measurement of performance. The experimental result shows that the proposed algorithm reduces energy consumption by 56% on maximal performance.

A Medium Access Mechanism to Support Urgent Message Transmission (긴급 메시지 전송을 지원하기 위한 매체 접근 기법)

  • Han, Se-Won;Oh, Young-Bin;Sim, Jae-Ki;An, Beoung-Ku
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • 제10권1호
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    • pp.97-105
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    • 2010
  • This paper proposes an effective medium access mechanism which is based on IEEE 802.11 to transmit an urgent message, The main features of the proposed mechanism are as follows. First, when it comes to channel access to have high priority, it has a shorter interval between frames than that specified in standard document. Second, we use fixed window size instead of back-off window with an exponential increase. Performance evaluation of proposed mechanism is executed by simulation and compare with the node using the specified mechanism in standard document. Performance evaluation results show that according to increasing competition the nodes using proposed method have less accessing time than the conventional methods. Also, the proposed method can improve processing time because of the decreasing transmission delay.

Development of Multi-Touch/Context-Aware Convergence Digital Signage System based on Android OS Platform (안드로이드 플랫폼 기반 멀티 터치/상황인지형 융복합 디지털 사이니지 시스템 개발)

  • Nahm, Eui-Seok
    • Journal of Digital Convergence
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    • 제13권8호
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    • pp.245-251
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    • 2015
  • If a digital signage system is operated in PC mounted in the Window OS then the implementing price is very high. For resolving this problem, we used the Smartphone mounted in ARM Cortex family of multi-core processor-based mobile platform. We developed a low-power low-cost digital signage system and a remote convergence content management program based on web server. This convergence system manages advertising content to a remote control device anywhere using remote control technology. This system is one integrated system with display and is a low-power consumed and is developed in very efficient hardware interface. And condition sensors(intensity of illumination, temperature, weather, GPS etc) is equipped in the developed system. Automatic contents builder and Context-aware SMIL module is also implemented in the convergence system. We achieved over 50% power savings comparing with conventional Window OS system and 16 points multi-touch in our system.

'Hot Search Keyword' Rank-Change Prediction (인기 검색어의 순위 변화 예측)

  • Kim, Dohyeong;Kang, Byeong Ho;Lee, Sungyoung
    • Journal of KIISE
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    • 제44권8호
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    • pp.782-790
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    • 2017
  • The service, 'Hot Search Keywords', provides a list of the most hot search terms of different web services such as Naver or Daum. The service, bases the changes in rank of a specific search keyword on changes in its users' interest. This paper introduces a temporal modelling framework for predicting the rank change of hot search keywords using past rank data and machine learning. Past rank data shows that more than 70% of hot search keywords tend to disappear and reappear later. The authors processed missing rank value, using deletion, dummy variables, mean substitution, and expectation maximization. It is however crucial to calculate the optimal window size of the past rank data. We proposed an optimal window size selection approach based on the minimum amount of time a topic within the same or a differing context disappeared. The experiments were conducted with four different machine-learning techniques using the Naver, Daum, and Nate 'Hot Search Keywords' datasets, which were collected for 2 years.