• 한국정보컨버전스학회:학술대회논문집
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• 한국정보컨버전스학회 2008년도 International conference on information convergence
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• pp.53-56
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• 2008

This paper reports on the ACQA(Animated agent for Conversational Question Answering) project conducted at LIMSI. The aim is to design an expressive animated conversational agent(ACA) for conducting research along two main lines: 1/ perceptual experiments(eg perception of expressivity and 3D movements in both audio and visual channels): 2/ design of human-computer interfaces requiring head models at different resolutions and the integration of the talking head in virtual scenes. The target application of this expressive ACA is a real-time question and answer speech based system developed at LIMSI(RITEL). The architecture of the system is based on distributed modules exchanging messages through a network protocol. The main components of the system are: RITEL a question and answer system searching raw text, which is able to produce a text(the answer) and attitudinal information; this attitudinal information is then processed for delivering expressive tags; the text is converted into phoneme, viseme, and prosodic descriptions. Audio speech is generated by the LIMSI selection-concatenation text-to-speech engine. Visual speech is using MPEG4 keypoint-based animation, and is rendered in real-time by Virtual Choreographer (VirChor), a GPU-based 3D engine. Finally, visual and audio speech is played in a 3D audio and visual scene. The project also puts a lot of effort for realistic visual and audio 3D rendering. A new model of phoneme-dependant human radiation patterns is included in the speech synthesis system, so that the ACA can move in the virtual scene with realistic 3D visual and audio rendering.

• International journal of advanced smart convergence
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• 제1권1호
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• pp.6-13
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• 2012

An improved algorithm for image quality assessment is presented. First a simple model of human visual system, consisting of a nonlinear function and a 2-D filter, processes the input images. This filter has one user-defined parameter, whose value depends on the reference image. This way the algorithm can adapt to different scenarios. In the next step the average value of locally computed correlation coefficients between the two processed images is found. This criterion is closely related to the way in which human observer assesses image quality. Finally, image quality measure is computed as the average value of locally computed correlation coefficients, adjusted by the average correlation coefficient between the reference and error images. By this approach the proposed measure differentiates between the random and signal dependant distortions, which have different effects on human observer. Performance of the proposed quality measure is illustrated by examples involving images with different types of degradation.

• 방송공학회논문지
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• 제23권2호
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• pp.206-217
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• 2018

본 논문은 영상 신호의 방향을 고려하여 기존의 multiband energy scaling 방법의 문제점을 보완하면서 human visual system(HVS)에 적합한 영상 local contrast 향상 방법을 개발하였다. 기존의 multiband energy scaling 방법은 신호 방향에 대한 고려 없이 화질을 향상시켜 ringing artifact가 발생하였으나 본 논문에서는 block gradient를 사용하여 신호의 방향을 측정하고 측정된 신호 방향에 따라 주파수 신호를 향상시켜 ringing artifact의 발생 없이 화질을 향상시켰다. 또한 본 논문은 human visual system(HVS)은 각 신호의 값 하나하나 보다는 각 신호가 가지는 주파수에 성분에 민감하게 반응한다는 것을 이용하여 주파수 성분에 대한 인간 시각의 민감도를 모델링한 contrast sensitivity function(CSF)에 따라 영상의 화질을 향상시켰다. 결국 본 논문에서 제안하는 방법은 신호의 특성과 인간 시각의 특성을 모두 고려하여 영상의 화질을 향상시키기 때문에 기존의 화질 향상 방법들에 비해 영상 신호와 인간 시각 특성에 더욱 적합하게 화질을 향상시킬 수 있다.

• 한국멀티미디어학회논문지
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• 제13권10호
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• pp.1547-1556
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• 2010

현재까지 유아나 장애인을 위한 컴퓨터 활용 교육 콘텐츠는 지각훈련, 인지훈련, 한글 교육 등 다양한 분야에서 개발되었으나 가장 큰 문제점은 컴퓨터 모니터 앞에서 장시간 마우스를 이용하여 교육을 할 경우 활동성이 저하된다는 점이다. 이것은 특히 왕성하게 운동 능력이 발달하는 시기의 유아와 운동 장애로 인해 활동 기회가 부족한 장애 아동에게 적잖은 문제점으로 지적되어 왔다. 이와 같은 문제점을 개선하고 활동성과 협동력, 몰입성을 강화시키는 콘텐츠를 개발하기 위해서는 터치스크린과 같은 스크린 상에서 인간의 동작을 인식하여 이를 대화식으로 보여주는 기술이 필요하다 본 연구에서는 기존의 컴퓨터 활용 콘텐츠의 단점을 보완하고, 사용자의 활동성을 강화하기 위해 위모트가 가지는 센서 기술을 활용하여 실시간으로 빔 프로젝터나 컴퓨터 스크린으로 교육콘텐츠를 제공하고 신체를 직접 움직이며 적외선 펜을 사용하여 자극에 반응하는 교육 콘텐츠를 개발하였다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
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• pp.125-128
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• 2005

The visual perception tests were conducted to determine limits of luminance of a LCD TV from a viewpoint of glare. The results showed that people, who watch TV in their living room, perceive glare above $410\;cd/m^2$ at full window and $590\;cd/m^2$ at 1/25 window.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제16권1호
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• pp.33-46
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• 2005

본고에서는 인간의 뇌 발달과 주의력, 지각, 기억, 언어 등 다양한 인지기능의 발달과의 관계를 살펴본 후, Luria의 발달 신경심리 이론 및 그에 입각하여 개발된 아동용 Luria-Nebraska신경심리검사를 간략하게 소개하였다. 마지막으로, 현재 국내, 외에서 널리 사용되는 주의력 검사, 시-지각 검사, 시각-운동 협응 능력 검사, 그리고 전두엽의 집행기능검사 등을 포함한 아동용 신경심리 평가도구에 대해 고찰해보았다.

• Journal of Multimedia Information System
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• 제6권4호
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• pp.251-258
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• 2019

In the image methodology, cinemagraphs are needed to find out how to think through the empirical studies of the audiences in actual empirical theory. Therefore, this study analyzes what cinemagraph images represent and what groups are inclined to see them. The analytical study aims to reveal the grouping categorized as a preference survey according to the subjectivity study by Q methodology. Research reveals how images should be read and how disparities tend to differ from or agree with those in understanding images. Therefore, four types categorized into Q analysis through 1: 1 interview using a sample group and using samples showed that human interpretation and cinemagraph images were represented in understanding cinemagraphs.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
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• pp.1497-1499
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• 2007

Visual perception experiments were conducted to determine the acceptable limit of the contrast ratio of LCD TV under the watching condition. The results showed that the corresponding contrast ratio should be below 10,000:1 at the 3H(height of screen) distance in the living room environment.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권2호
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• pp.1080-1099
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• 2019

A better tradeoff between robustness and invisibility will be realized by using the just noticeable (JND) model into the quantization-based watermarking scheme. The JND model is usually used to describe the perception characteristics of human visual systems (HVS). According to the research of cognitive science, HVS can adaptively extract the structure features of an image. However, the existing JND models in the watermarking scheme do not consider the structure features. Therefore, a novel JND model is proposed, which includes three aspects: contrast sensitivity function, luminance adaptation, and contrast masking (CM). In this model, the CM effect is modeled by analyzing the direction features and texture complexity, which meets the human visual perception characteristics and matches well with the spread transform dither modulation (STDM) watermarking framework by employing a new method to measure edge intensity. Compared with the other existing JND models, the proposed JND model based on structural regularity is more efficient and applicable in the STDM watermarking scheme. In terms of the experimental results, the proposed scheme performs better than the other watermarking scheme based on the existing JND models.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2008년도 정기 학술대회
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• pp.228-233
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• 2008

In this paper, peak acceleration for horizontal vibration of buildings was estimated from the results of vibration tests using a shaking table. Human comfort of occupants is supposed to be satisfied according to the peak acceleration in NBCC and ISO6897, which have been used by Korean structural engineers. In the paper, we used a one-dimensional shaking table for horizontal vibration tests, which was mounted with a vibration house similar to a living space. Experimental results were obtained according to increasing accelerations in the range of 0.2Hz through 1.2Hz of frequency with five experimental groups, each of which was composed of eight persons. We obtained performance curves by dividing the distribution of perception from horizontal vibration tests into the ranges of 0${\sim}$25%, 26${\sim}$50%, 51${\sim}$75%, 76${\sim}$100% and then fitting the curves. Also we made a questionnaire based on human comfort criteria of foreign countries, and examined the feelings of subjects. From the results of horizontal vibration tests, it was found that acceleration of perception was low when frequency was high, and that visual and auditory senses affect the human perception for horizontal vibration of buildings.