• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2002.11a
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• pp.9-14
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• 2002

Direct-conversion receiver(DCR) architecture has superior advantages in size, cost, and power over superheterodyne receiver architectures. However, the use of direct-conversion receiver architecture has been limited due to the direct-current offset noise. The ac coupling, which is used to overcome the direct-current offset noise, causes an inter-symbol interference(ISI), whose effects can be effectively mitigated using an equalizer. In this paper, the performance of a direct-conversion receiver with ac coupling in the presence of direct-current offset is analyzed via computer simulation. The simulation result shows that by using decision feedback equalizer with LMS(Least Mean Square) algorithm, signal-to-noise ratio loss of the direct-conversion receiver compared to the idea receiver can be reduced to less than 1㏈ for corner frequencies as large as 10% of the symbol rate.

• Journal of the Korean Graphic Arts Communication Society
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• v.19 no.2
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• pp.58-67
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• 2001

Gamut mapping is a technique that acts on cross-media color reproduction to transform a color between devices for the purpose of enhancing the appearance or preserving the appearance of an image. Gamut mapping essentially produces color conversion error which depends the gamut mapping method, source and destination devices, and sample points for gamut modeling. For color space conversion between monitor colors and printer colors, empirical representation using sample measurements is currently widely utilized. Color samples are uniformly selected in the device space such as CMY or RGB, represented as color patches, and then measured. However, in the case of printer, these color samples are not evenly distributed inside the printer gamut and the color conversion error is increased. Accordingly, this paper introduces a equally distributed color sampling method in CIELAB space, a device- independent color space, to reduce color conversion error, and the performance is analyzed via color space conversion experiments using tetrahedral interpolation.

• Archives of design research
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• v.15 no.1
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• pp.309-318
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• 2002

An expression of image in visual communication design traditionally has a dose relationship with the mechanical part of several expression media. Especially, an image conversion becomes easter by converging various forms of image such as a pictorial expression, a drawing up a plan, an optical expression and a reflected image into digital data in the image expression using digital mode. In addition, synthesis between various forms of visual ,images is activated by the integration of all expression media into digital mode and thus the extent of the image expression becomes diversified. Moreover, there is a tendency that a various dimensional expression such as 3D and 4D is generalized in the image expression of digital design. A partial or whole image conversion has often occurred during the generalization process of several image forms. Such conversion summarized into two factors, a formative side and a technical side. We described the existing pictorial expression as a formative side, an optical expression as a photography, a materialization of image conversion theory of computer graphic image conversion according to data form as a technical side and specific content according to dimension. We summarized objective and demonstrative resets through a simple simulation using a computer for the contents required a technical and qualitative measure and presented an application program of the particular results from the study to the visual communication design work by a case.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• fall
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• pp.65-67
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• 2021

국내 지상파 방송의 경우 2027년에 DTV를 종료하고 UHDTV로 완전 전환이 될 예정이다. 이러한 일정을 감안하면 기존 DTV 수상기를 보유한 가정에서는 UHDTV를 수신할 수 없어 TV를 시청할 수 없는 문제가 발생한다. 이를 위해서는 UHD 서비스를 DTV 서비스로 변환하여 제공할 수 있는 공시청 시스템 개발이 요구되는데, 본 논문은 이러한 공시청 시스템에서 UHDTV의 서비스 및 프로그램 정보를 DTV의 PSI/PSIP 정보로 변환하는 방법에 관한 것이다.

• Journal of Digital Convergence
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• v.6 no.4
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• pp.73-81
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• 2008

Market penetration of media capital and with domestic broadcasting and communication fusion affect from the contents competitive situation which is general, the digital conversion of ground group broadcasting which follows in like this change tried to point out the hereafter direction of broadcasting contents industry with Korean-American FTA compromises. Further with role of the program heightening of competitiveness plan for the ground group digital contents activation of local broadcasting and loca broadcasting accomplishes the funeral of succession development and area public opinion integration of politics, economy and culture of the community and being understood for a harmony, and proposed a politic alternative in the Broadcast Communications Commission which starts newly and Local Broadcasting Developmental Commission.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.431-433
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• 2011

본 논문에서는 기존의 영상 및 동영상 편집 툴을 사용하여 2D 동영상을 3D 입체영상으로 변환하는 절차를 분석하고, 변환 과정에서 나타나는 비효율적 요소 및 자동화 가능 요소 등을 분류한다. 또한, 기존의 3D 입체영상 변환 도구의 종류 및 한계점을 분석하고, 분석 내용을 기반으로 3D 입체 영상 변환 전용도구의 필수 기능을 설계한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2021.06a
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• pp.145-146
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• 2021

본 논문에서는 저화질의 구작 콘텐츠를 고품질로 변환하기 위한 클라우드 기반의 미디어 변환 시스템에 대한 구조 및 설계 방안에 대하여 제안한다. 우선 저화질의 콘텐츠를 고품질로 변환하기 위한 핵심요소기술에 대하여 정의하고, 이러한 요소기술이 적용된 클라우드 기반 시스템의 구조설계를 제안한다. 제안한 구조에 기반하여 각각의 요소기술이 효율적으로 결합된 통합 시스템을 제안하고 이를 통해 상용화 수준의 솔루션을 얻는 것을 목표로 한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.01a
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• pp.67-70
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• 2009

This paper proposes an algorithm for creating stereoscopic video from a monoscopic video. A viewer uses depth perception clues called a vanishing point which is the farthest from a viewer's viewpoint in order to perceive depth information from objects and surroundings thereof to the viewer. The viewer estimates the vanishing point with geometrical features in monoscopic images, and can perceive the depth information with the relationship between the position of the vanishing point and the viewer's viewpoint. In this paper, we propose a method to estimate a vanishing point with edge direction histogram in a general monoscopic image and to create a depth map depending on the position of the vanishing point. With the conversion method proposed through the experiment results, it is seen that stable stereoscopic conversion of a given monoscopic video is achieved.

• Journal of Broadcast Engineering
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• v.16 no.1
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• pp.73-84
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• 2011

In the 2000s, digital HDTV which is sensitive for color temperature and illumination in videos has witnessed many changes to lighting techniques and the next-generation UHDTV will see its resolution being improved up to as 16 times as that of existing high-definition TV. As a result, visible effects by lighting is expected to work more importantly for viewers. When color temperature conversion filters are used for current broadcasting production, the intensity of illumination and luminance can be lowered as well as people's skin tone can be distorted. For this reason, high-quality images are materialized by analyzing the correlation between color temperature, illumination and luminance.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.557-559
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• 2015

움직임 보상 기반 프레임율 변환(Frame rate up-conversion based on motion compensation )에서 발생하는 블로킹 현상(Blocking artifact)을 줄여 영상의 화질을 높이기 위한 디블로킹 필터(De-blocking filter) 방법을 제안한다. 이 방법은 블록 단위로 동작하는 움직임 보상 과정에서 주변 블록과의 움직임이 급격히 달라지는 폐색영역에서 발생하는 블로킹 현상을 크게 줄일 수 있다. 제안하는 방법은 기존의 필터링을 하지 않는 방법보다 화질이 약 0.01db 향상하였다.