• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.7
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• pp.922-934
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• 1993

In this paper, statistical properties of the spatiotemporal center weighted median(CWM) filter for image sequences are investigated. It is statistically shown that the CWM filter preserves image structures under motion at the expense of noise suppression. To improve the CWM filter, a filter which can be effectively used in image sequence processing, the adaptive directional center weighted median filter (ADCWM), is proposed. This filter utilizes a multistage filtering structure based on adaptive symmetric order statistic(ASOS) operators which produce a pall of order statistics symmetric about the median. The ASOS's are selected by using adaptive parameters adjusted by local image statistics. It is shown experimentally that the proposed filter can preserve image structures while attenuating noise without the use of motion estimation.

• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.3
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• pp.256-261
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• 2010

In this paper, a new nonlinear predictor using general regression neural network(GRNN) is proposed for the subband coding of moving pictures. The performance of a proposed nonlinear predictor is compared with BMA(Block Match Algorithm), the most conventional motion estimation technique. As a result, the nonlinear predictor using GRNN can predict well more 2-3dB than BMA. Specially, because of having a clustering process and smoothing noise signals, this predictor well preserves edges in frames after predicting the subband signal. This result is important with respect of human visual system and is excellent performance for the subband coding of moving pictures.

• Proceedings of the Korea Multimedia Society Conference
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• 2004.05a
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• pp.374-377
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• 2004

동영상 강의는 시간이나 장소 등에 크게 구애받지 않고 인터넷을 통하여 쉽게 이용할 수 있는 간편한 학습방법중의 하나이다. 그러나 학습자의 학습자세와 태도에 따라 학습효과는 매우 다를 수 있는 문제점을 가지고 있다. 본 논문에서는 입력영상으로부터 학습자의 얼굴정보를 입력받아 주기적으로 탐색하여 학습자의 강의에 대한 집중도와 충실도를 평가하는 시스템을 제안하고자 하였다. 먼저 입력영상의 분할된 중심영역으로부터 학습자의 얼굴을 포함하는 신체정보를 입력받아 사용하였으며, 빠르고 효율적인 얼굴영역의 추출을 위하여 피부색상(skin-color)정보와 얼굴의 지역적 특성을 이용하는 방법을 사용하였다. 또한 주기적으로 입력되는 영상의 빠른 얼굴추적을 위하여 설정된 영역들로부터 구성되는 블록들의 위치와 구성정보를 이용한 블록탐색 기법을 사용하였다.

• Journal of KIISE
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• v.42 no.3
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• pp.413-418
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• 2015

In this paper, we design new video metadata schema for searching video segments to create UEC (User Edited Contents). The proposed video metadata schema employs hierarchically structured units of 'Title-Event-Place(Scene)-Shot', and defines the fields of the semantic information as structured form in each segment unit. Since this video metadata schema is defined by analyzing the structure of existing UECs and by experimenting the tagging and searching the video segment units for creating the UECs, it helps the users to search useful video segments for UEC easily than MPEG-7 MDS (Multimedia Description Scheme) which is a general purpose international standard for video metadata schema.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10d
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• pp.196-198
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• 2002

본 논문에서는 축구 동영상에서 스포츠 중계방송의 특성을 이용하여 자동적으로 하이라이트(Highlight)를 추출하는 새로운 방법을 제안하고 실험을 통하여 그 유용성을 증명한다. 일반적으로 스포츠 중계 방송에서는 중요한 이벤트(골, 반칙)가 발생하면 그 장면 을 다시 느린속도의 리플레이(Replay) 화면으로 보여주고, 리플레이가 시작되고 끝날 때 Wipe와 같은 점진적인 화면 전환 기법을 사용하는 특성을 가지고 있다. 본 논문에서는 이러한 스포츠 중계방송의 특징을 이용하여 Wipe검출, Replay검출 및 Zoom-In/Out 전환 검출을 이용하여 전체 축구 동영상에서 하이라이트만을 추출하는 방법을 제안한다.

• Journal of the Institute of Convergence Signal Processing
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• v.5 no.2
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• pp.91-95
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• 2004

In this paper, we propose a fuzzy controller for the evaluation of the quantization parameters in the H.263 coder. Our method adopts the Mamdani method for fuzzification and adopts the centroid method for defuzzification respectively. The inputs are variance, entropy in the spatial domain, current motion vector and previous motion vector in the temporal. Fuzzy variables are determined to be compatible in visual characteristics and fuzzy membership function is induced and then, FAM banks are designed to reduce the number of rules. In this paper, fuzzy quantization has been applied to a practical video compression. This results show that the quality of decode image enhances and the rate control method using fuzzy quantization is effective.

• Journal of Korea Multimedia Society
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• v.7 no.5
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• pp.640-647
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• 2004

This paper presents a method that, by using a tree splay, dynamically modifies the fixed table of a VLC used in the standards and thus improves the performance of a video encoder. The previous standards, which drew up tables by using a limited number of images, were not able to accommodate the characteristics of new image input. The new method proposed in this paper employs the probabilistic characteristics of an image input, thus making encoding more effective. Furthermore, the present study also proposes a method to regulate the weight in order that the accumulated probabilities can make a dominant symbol emerge, while keeping the probability adequate and thus maximally accommodating the characteristics of the image input. The results from applying the proposed method to a variety of image sequences showed that, while various types of images yielded slightly different results, it improved the performance up to a maximum of 0.23㏈, compared to MPEG-4 standard.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.20 no.3
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• pp.308-315
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• 2010

This study introduces a new technique to estimate modal parameters of a vibrating string using motion pictures. The approach requires two motion pictures for a vibrating string captured simultaneously by typical potable digital cameras or camcorders. Applying the space intersection theory and the space resection theory in photogrammetry, the steroscopic images for the string are constructed from two flat plane pictures. Then the three dimensional displacement components of the string are extracted by a multiple template matching technique. Finally the modal parameters of the string are estimated from the resulting displacement time histories. The accuracy of the approach has been examined through a small-scale mock-up of a string.

• Journal of the Korean Institute of Intelligent Systems
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• v.23 no.2
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• pp.184-189
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• 2013

In this paper, we propose the injurious moving picture filtering system using certain sounds contained in the injurious moving picture to filter injurious moving picture which is distributed without limitation in internet and internet storage space. For this purpose, the Gaussian Mixture Model which can well represent the characteristics of the sound, is used and frame level likelihood estimation is used to calculate the likelihood between filtering target data and the sound models. Also, the pruning method which can real-time proceed by reducing the comparing number of data, is applied for real-time processing, and MWMR method which showed good performance from existing speaker identification, is applied for the distinguish performance of high precision. In the identification experiment result, in case of the frame rate which is the proportion of total frame to high likelihood frame, is set to 50%, identification error rate is 6.06%, and in case of frame rate is set to 60%, error rate is 3.03%. As the result, the proposed system can distinguish between general and injurious moving picture effectively.

• Proceedings of the Korean Society of Computer Information Conference
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• 2012.07a
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• pp.95-96
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• 2012

본 논문에서는 웹 페이지에서 사용되는 광고 콘텐츠에 대해서 나타낸다. 웹 페이지에서 사용되는 광고 콘텐츠는 모션 그래픽으로 제작하여 인터렉티브하게 이용 된다. 또한 웹 페이지에서 사용되는 광고는 광고의 특성을 가지고 있다. 따라서 광고의 특성에 따라 콘텐츠의 특성도 달라진다. 웹 페이지에서 사용되는 광고 콘텐츠은 특성에 따라 이미지 광고와 동영상 광고로 분류한다. 이들 콘텐츠의 특성으로 이미지의 사이즈와 동영상의 사이즈, 제작 파일 크기, 재생 시간, 웹 페이지의 위치에 따라서 다양한 광고 효과를 연출한다. 따라서 광고 효과를 나타내기 위해서는 제작 광고 콘텐츠의 특성과 인터렉티브 콘텐츠의 특성이 고려되어야 한다.