• The Journal of the Korea institute of electronic communication sciences
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• v.18 no.5
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• pp.911-918
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• 2023

This paper analyzed technologies related to video and sound device manufacturing closely related to media images, divided applicants into companies, research institutes, universities, individuals and the public, and conducted technical statistical analysis, collective intelligence analysis, and open innovation analysis. It is necessary to express innovative ideas through technology in research institutes or universities, and efforts are needed to expand technologies in the media field in universities. Looking at the contents of patents actually filed, patents filed by companies or individuals were mostly related to media technology, and patents filed by universities and research institutes were mostly related to media content. This means that hardware technology patents should be developed extensively and in-depth in an inseparable relationship between media technology and content, and should be a driving force for software content to play a more diverse and creative role.

• The Journal of the Korea Contents Association
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• v.14 no.12
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• pp.818-834
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• 2014

The purpose of this study is to examine parents' mental model of media environment and children's media use and to provide some educational suggestions. For this purpose, twelve parents of second-graders to fourth-graders sampled in elementary schools were interviewed with three activities such as a word-association experiment, a sentence completion task and a in-depth interview. The result was categorized into 8 elements such as interaction, source of supply and adverse effects. Furthermore, the analysis on the mental model of media use shows that firstly, the parents understand modern media reflects competence while they have a feeling of fear and newness on media themselves. Secondly, the parents show an ambivalent understanding on media use in terms of both negative and positive effects and have a tendency to control them. Another finding is the fact that the parents understand digital media as a representation of both connection and disconnection. Also, the parents realize media as a cause of conflict and as a place for reconciliation as well. Finally, it is showed that media is not only a personal territory but also a part of social system in the parents' understanding. Based on these findings, some interpretations and parents' educational applications are provided in terms of the Meyrowitz(1998; 1999)'s three perspectives on media.

• Journal of Broadcast Engineering
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• v.14 no.5
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• pp.616-624
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• 2009

This paper presents a 3D stereoscopic TIP (Tour Into Picture) for Korean classical paintings being composed of persons, boat, and landscape. Unlike conventional TIP methods providing 2D image or video, our proposed TIP can provide users with 3D stereoscopic contents. Navigating a picture with stereoscopic viewing can deliver more realistic and immersive perception. The method firstly makes input data being composed of foreground mask, background image, and depth map. The second step is to navigate the picture and to obtain rendered images by orthographic or perspective projection. Then, two depth enhancement schemes such as depth template and Laws depth are utilized in order to reduce a cardboard effect and thus to enhance 3D perceived depth of the foreground objects. In experiments, the proposed method was tested on 'Danopungjun' and 'Muyigido' that are famous paintings made in Chosun Dynasty. The stereoscopic animation was proved to deliver new 3D perception compared with 2D video.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.11a
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• pp.77-80
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• 2009

3차원 영상 처리 기술과 3차원 디스플레이의 발전은 3차원 영상 시장의 빠른 발전을 가져왔고 차세대 방송 기술로 큰 관심을 받고 있다. 하지만 3차원 영상은 시청할 때 눈의 피로, 어지럼증과 같은 현상이 일어날 수 있으며, 왜곡된 3차원 영상이 인체에 해로운 영향을 미칠 수도 있다. 이는 3차원 영상 산업의 활성화를 위해서 가장 시급히 해결되어야 할 문제이다. 현재 3차원 디스플레이는 스테레오 방식과 함께 1view 1depth 다시점 방식이 개발되었다. 특히 1view 1depth 다시점 디스플레이에서 깊이 영상의 공간적/시간적으로 복잡한 정도는 피로감을 일으키는 주요 요소이며 이는 1view 1depth 영상을 통해 직접 연구할 수 있다. 본 논문에서는 1view 1depth 디스플레이에서 주관적인 피로도와 큰 상관도를 가지는 깊이 영상의 특성 측정 방법을 제안한다. 1view 1depth 디스플레이에서 view 영상은 양호한 화질을 가정하였으며 피로감에 큰 영향을 미치는 깊이 영상 정보만 사용하여 공간적, 시간적인 특성을 분석한다. 공간적 복잡도는 각 프레임에 대하여 깊이 영상 내 화소 값의 분산 값을 취하여 공간적으로 깊이 값의 분포와 구조의 복잡한 정도를 측정하고, 시간적 복잡도는 연속적인 프레임에 대하여 동일한 화소위치에서 화소 값 차이의 분산 값을 사용한다. 또한 공간적/시간적 평균값의 측정하여 피로감에 영향을 주는 요인으로 사용하였다. 결과적으로 측정한 값들을 바탕으로 주관적인 피로도 평가와 유사성을 가지도록 모델링하여 3차원 영상의 피로도를 예측한다.

• Journal of Broadcast Engineering
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• v.17 no.3
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• pp.459-470
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• 2012

In this paper, we propose a method to upsample a low-resolution depth map to a high-resolution version. While conventional camera sensors produce high-resolution color images, the sizes of the depth maps of range/depth sensors are usually low. In this paper, we consider the utilization of high-frequency components to the conventional depth map interpolation methods such as bilinear, bicubic, and bilateral. The proposed method is composed of the three steps: high-frequency component extraction, high-frequency component application, and interpolation. Two objective evaluation measures such as sharpness degree and blur metric are used to examine the performance. Experimental results show that the proposed method significantly outperforms other conventional methods by a factor of 2 in terms of sharpness degree. As well, a blur metric is reduced by a factor of 14 %.

• Journal of Broadcast Engineering
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• v.19 no.4
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• pp.533-546
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• 2014

This paper presents a method for a hybrid (color and depth) camera system construction using a photogrammetric technology. A TOF depth camera is efficient since it measures range information of objects in real-time. However, there are some problems of the TOF depth camera such as low resolution and noise due to surface conditions. Therefore, it is essential to not only correct depth noise and distortion but also construct the hybrid camera system providing a high resolution texture map for generating a 3D model using the depth camera. We estimated geometry of the hybrid camera using a traditional relative orientation algorithm and performed texture mapping using backward mapping based on a condition of collinearity. Other algorithm was compared to evaluate performance about the accuracy of a model and texture mapping. The result showed that the proposed method produced the higher model accuracy.

• Journal of Broadcast Engineering
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• v.17 no.6
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• pp.945-953
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• 2012

A depth map can be obtained by projecting/capturing patterns of stripes using a projector-camera system and analyzing the geometric relationship between the projected patterns and the captured patterns. This is usually called structured light technique. In this paper, we propose a new multi-threading scheme for accelerating a conventional structured light technique. On CPUs and GPUs, multi-threading can be implemented by using OpenMP and CUDA, respectively. However, the problem is that their performance changes according to the computational conditions of partial processes of a structured light technique. In other words, OpenMP (using multiple CPUs) outperformed CUDA (using multiple GPUs) in partial processes such as pattern decoding and depth estimation. In contrast, CUDA outperformed OpenMP in partial processes such as rectification and pattern segmentation. Therefore, we carefully analyze the computational conditions where each outperforms the other and do use the better one in the related conditions. As a result, the proposed method can estimate a depth map in a speed of over 25 fps on $1280{\times}800$ images.

• Korean journal of communication and information
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• v.81
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• pp.75-121
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• 2017

Maeul Community Media is community media practice that media education combine with community activism based on the region. Maeul Community Media appeared with Seoul city's supporting policy in 2012 and is now enlarging on a national scale beyond Seoul. This study is aimed at understanding and investigating Maeul Community Media activists' practice process by using a grouned theory approach. In-depth interviews were carried out of study participants who worked on as activists based on visual and radio field since 2012. By open coding based on grounded theory, 16 categories and 59 subcategories were discovered. The outcome of axial coding showed the centeral phenomena that can be called 'sustainable desire for Maeul Community Media act'. On the condition of the instability of public support and the absence of a village channel, the strategic practices were discovered, which are diversification of participants recruitment and modes of participation, invention of space-media, seeking multilateral distribution methodologies and the collective action plans of networks to stabilize the management and to empower Maeul Community Media networks. As a result, Maeul Community Media and civil society were networked by discovering and agenda-setting pending issues. And we could find that the desire and expectation for the role as a village's public sphere were enlarging.

• Journal of Wetlands Research
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• v.21 no.4
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• pp.321-333
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• 2019

A primary aspect of low impact development (LID) design that affects performance efficiency, maintenance frequency, and lifespan of the facility is the type of filter media as well as the arrangement or media profile. Several LID guidelines providing media specifications are currently available and numerous studies have been published presenting the effectiveness of these systems. While some results are similar and consistent, some of them still varies and only a few focuses on the effect of filter media type and arrangement on system performance. This creates a certain level of uncertainty when it comes to filter media selection and design. In this review, a synthesis of filter media specifications from several LID design guidelines are presented and relevant results from different laboratory and field studies are highlighted. The LID systems are first classified as infiltration or non-infiltration structures, and vegetated or non-vegetated structures. Typical profiles of the media according to classification are shown including the different layers, materials, and depth. In addition, results from previous studies regarding the effect of filter media characteristics on hydraulic and hydrologic functions as well as pollutant removal are compared. Other considerations such as organic media leaching, clogging, media washing, and handling during construction were also briefly discussed. This review aims to provide a general guideline that can contribute to proper media selection and design for structural LIDs. In addition, it also identifies opportunities for future research.

• The Journal of the Korea Contents Association
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• v.14 no.4
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• pp.97-109
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• 2014

Social media is a general term for online services by which users share opinions, perspectives, and experiences. It supports interactions between users in sharing contents on it and weak ties among them play an important role in the process. This exploratory study attempts to identify crucial factors of establishing weak ties between social media users in the perspective of social network theory and uncertainty reduction theory. We collected data through diary study and in-depth interview and analyzed it following grounded theory approach. As a result, social media users more actively interacted each other or shared contents based on weak ties, compared to strong ties. In addition, similarity, self-disclosure, and relevance appeared to facilitate establishment of weak ties, by reducing psychological distance between social media users and perceived uncertainty of them.