• 대한인간공학회지
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• 제32권5호
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• pp.449-457
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• 2013

Objective: The aim of this study is to investigate the effect of Hangul font on reading speed when texts are displayed on the computer screen. Background: Reading performance is influenced by fonts. However, there are few studies of Hangul font from a cognitive perspective. Fonts could affect reading performance directly and indirectly, interacting with other visual-perceptual factors such as size, word spacing, and line spacing. Method: In experiment 1, two variables were manipulated; a frame condition(square frame non-square frame) and a stroke condition(serif sans-serif). According to each condition, one of the four fonts was applied to the texts. The height of the four fonts was controlled. The participants were asked to read aloud the presented texts. In experiment 2, the non-square frame fonts were adjusted to have approximately the same size, width, letter spacing, and word spacing as the square frame fonts. The experimental design and task used in experiment 2 were identical with experiment 1. Results: In general, reading speed was faster in the square frame fonts than in the non-square frame fonts. The reading speed was not significantly different across stroke conditions. Conclusion: The frame of Hangul font significantly influenced reading speed. These results suggest that the type of Hangul font is a factor to affect reading performance. Application: The frame of fonts should be considered in designing of new fonts. The square frame fonts should be the preferred choice to enhance legibility.

• ETRI Journal
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• 제31권1호
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• pp.21-30
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• 2009

In low bit-rate video transmission, the payload of a single packet can often contain a whole coded frame due to the high compression ratio in both spatial and temporal domains of most modern video coders. Thus, the loss of a single packet not only causes the loss of a whole frame, but also produces error propagation into subsequent frames. In this paper, we propose a novel whole frame error concealment algorithm which reconstructs the first of the subsequent frames instead of the current lost frame to suppress the effects of error propagation. In the proposed algorithm, we impose a constraint which uses side match distortion (SMD) and overlapped region difference (ORD) to estimate motion vectors between the target reconstructed frame and its reference frame. SMD measures the spatial smoothness connection between a block and its neighboring blocks. ORD is defined as the difference between the correlated pixels which are predicted from one reference pixel. Experimental results show that the proposed algorithm effectively suppresses error propagation and significantly outperforms other conventional techniques in terms of both peak signal-to-noise ratio performance and subjective visual quality.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 제13회 신호처리 합동 학술대회 논문집
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• pp.429-432
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• 2000

We propose a new frame rate up-conversion algorithm for high quality video. In the proposed scheme bidirectional motion estimation (ME) is performed to construct the motion vector. (MV) field for the frame to be interpolated. Unlike conventional motion-compensated interpolation (MCI) algorithms, the proposed technique does not produce any overlapped pixel and hole region in the interpolated frame, and thus can utilize the overlapped block motion compensation technique to reduce the blocking artifacts. The proposed algoritm is very simple to implement on consumer products when compared to conventional MCI methods. Computer simulation shows a high visual performance of the proposed frame rate up-conversion algorithm.

• 전자공학회논문지B
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• 제31B권8호
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• pp.109-118
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• 1994

We proposed new field/frame mode selection quantization and buffer control strategy for interlaced digital HDTV image coding system. The field/frame mode selection is performed based on the mean square error and number of generated bits for each superblock. The quantization factor for each superblock is determined by the characteristics of human visual system and buffer status. The statistical characteristics of the number of generated bits for basis block and the prediction of buffer status are used for buffer control. Simulation results show that the proposed field/frame mode selection and rate buffer control. Simulation results show that the proposed field/frame mode selection and rate buffer control strategy have good subjective image quality and have stable buffer status.

• 제어로봇시스템학회논문지
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• 제4권3호
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• pp.372-377
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• 1998

This paper deals with the detection, feature extraction and classification of surface defects in cold rolled strips. Inspection systems are one of the most important fields in factory automation. Defects such as slipmark and dullmark can be effectively detected with a Gaussian matched filter because their shapes are similar to Gaussian. It is justified that the proposed WF(Wavelet Frame) method could be regarded as multiscale Gaussian matched filter which can be applied to the inspection of cold rolled strip. After a wavelet frame transform, the entropies and moments are computed for each subband which pass through both local low pass filter and nonlinear operator. With these features as input, a MLP(Multi Layer Perceptron) is used as a classifier. The proposed inspection method was applied to the real images with defects, and hence showed good performance. The role of each extracted feature is analyzed by KLT(Karhunen-Loeve Transform).

• 디자인융복합연구
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• 제14권1호
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• pp.83-98
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• 2015

본 논문은 좋은 원작의 만화나 웹툰이 흥행에 그다지 성공을 거두지 못하고 있는 상황에서 웹툰의 영화화 중 최고의 흥행 스코어를 기록한 <은밀하게 위대하게>가 어떤 시각적 구성요소를 통해 영화관객을 매료시켰는지, 즉 웹툰과 영화에서 표현되는 시각적 텍스트 분석을 통해 이미지의 유사성을 검토하고자 한다. 이러한 논의는 우선적으로 웹툰과 영화의 싱크로율, 즉 이미지의 유사성에서 기인한 흥행성과의 의미를 도출하고자 한다. 또한 오늘날 웹툰의 영화화가 활성화되고 있는 시점에 그간 흥행의 부침을 겪은 웹툰의 영화화가 일시적인 유행이 아니라 지속가능한지에 대한 물음에 답을 구하고자 한다. 이를 위해 본 연구는 원작 웹툰과 영화화된 <은밀하게 위대하게>의 시각적 구성요소를 비교 분석하여 매체변형에 대한 의미와 가치 그리고 중요성을 제시하고자 한다. 주로 웹툰의 시각적 구성요소와 영화적 요소의 표현형식이 일치하고 있는 장면연출과 칸과 칸의 전환, 그리고 색채와 톤을 위주로 하여 분석할 것이다. 구체적인 구성요소는 화면의 크기, 움직임, 색상과 톤, 배경과 상황, 공간구도와 심도, 콘트라스트, 표현방식과 배열방식으로 텍스트를 나누어 웹툰과 영화의 시각적 표현 방식을 상호 비교한다.

• 한국멀티미디어학회논문지
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• 제20권7호
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• pp.986-993
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• 2017

Object Tracking is a technique for tracking moving objects over time in a video image. Using object tracking technique, many research are conducted such a detecting dangerous situation and recognizing the movement of nearby objects in a smart car. However, it still remains a challenging task such as occlusion, deformation, background clutter, illumination variation, etc. In this paper, we propose a novel deep visual object tracking method that can be operated in robust to many challenging task. For the robust visual object tracking, we proposed a Convolutional Neural Network(CNN) which shares weight of the convolutional layers. Input of the CNN is a three; first frame object image, object image in a previous frame, and current search frame containing the object movement. Also we propose a method to consider the motion of the object when determining the current search area to search for the location of the object. Extensive experimental results on a authorized resource database showed that the proposed method outperformed than the conventional methods.

• 한국통신학회논문지
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• 제27권11C호
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• pp.1097-1105
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• 2002

아날로그 모니터를 사용하는 디스플레이 시스템의 경우, 프레임 버퍼의 영상 정보 갱신 주기와 모니터 주사 주기가 맞지 않는 경우, 장면 변화가 심한 동영상 디스플레이시에 화면이 상단과 하단으로 다른 영상이 나타나는 tearing 현상이 발생한다. 다중 카메라 채널을 디스플레이하여야 하는 영상 감시 시스템인 DVR(Digital Video Recorder) 시스템에서는 프레임 버퍼 갱신율이 매우 높기 때문에 tearing 현상이 심하게 된다. 본 논문에서는 윈도우즈 기반 DVR에서 디스플레이 속도 성능의 저하가 별로 없으면서, tearing 현상을 방지한 개선된 디tm플레이 시스템 구조를 제안한다. 제안된 디스플레이 시스템의 효율성은 실험을 통하여 입증하였다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.801-803
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• 2003

In this paper, we present a method for generating and providing spatially encoded video data that can be effectively used by GIS applications. We collect the video data by a mobile mapping system called 4S-Van that is equipped by GPS, INS, CCD camera, and DVR system. The information about spatial object appearing in video, such as occupied region in each frame, attribute value, and geo-coordinate, are generated and encoded. We suggest methods that can generate such data for each frame in semi-automatic manner. We adopt standard MPEG-7 metadata format for representation of the spatially encoded video data to be generally used by GIS application. The spatial and attribute information encoded to each video frame can make visual browsing between map and video possible. The generated video data can be provided and applied to various GIS applications where location and visual data are both important.

• 한국산학기술학회논문지
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• 제9권4호
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• pp.992-999
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• 2008

본 연구의 목적은 방송 프로그램 제작에 있어서 중요한 역할을 하고 있는 영상 자막의 특성과 영상 커뮤니케이션 기능적인 관점에서 나타나고 있는 현상을 살펴보고자 한다. 다양한 방송 프로그램에서 활용되고 있는 영상 자막의 기능은 단순하게 간략한 정보를 전달하는 기능적인 역할을 수행하였다. 그러나 최근 다양한 방송 프로그램에서 활용되고 있는 영상 자막의 기능과 효과는 새로운 형태로 발전되고 있는 추세이다. 그러므로 본 논문에서는 텔레비전 프로그램에서 활용되고 있는 영상 자막의 특성을 고찰하고, 장르별 프로그램에서 사용되고 있는 영상 자막의 사례를 통한 다양한 현상들을 살펴보았다.