• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
• /
• pp.694-697
• /
• 2003

In applying LCD to TV application, one of the most significant factors to be improved is image sticking on the moving picture. LCD is different from CRT in the sense that it's continuous passive device, which holds images in entire frame period, while impulse type device generate image in very short time. To reduce image sticking problem related to hold type display mode, we made an experiment to drive LCD like CRT. We made articulate images by turn on-off backlight, and we realized the ratio of Back Light on-off time by adjusting between on time and off time for video signal input during 1 frame (16.7ms). Conventional CCFL (cold cathode fluorescent lamp) cannot follow fast on-off speed, so we evaluated new fluorescent substances of light source to improve residual light characteristic of CCFL. We realized articulate image generation similar to CRT by blinking drive. As a result, reduced image sticking phenomenon was validated by naked eye and response time measurement.

• 정보와 통신
• /
• 제24권4호
• /
• pp.15-26
• /
• 2007

멀티미디어 기술이 빠르게 발전함에 따라 보다 사실감 있는 콘텐츠의 수요가 급증하고 있다. 특히 2차원의 단방향 방송시스템에서 사용자의 요구에 따라 콘텐츠의 내용이 바뀌는 상호작용이 가능한 시스템이 활발히 연구되고 있다. 이러한 기술 중에 다시점 비디오는 여러 대의 카메라로 한 장면을 동시에 촬영한 영상으로, 사용자의 요구에 따라 시청 시점을 자유로이 선택할 수 있는 차세대 방송기술이다. 그러나 데이터의 양이 방대하여 다양한 서비스에 적용이 쉽지 않다. 이에 따라 MPEG(moving picture experts group)과 JVT (joint video team) 그룹은 다시점 비디오 부호화(multi-view video coding)의 국제 표준화 작업을 진행하고 있다. 2001년 12월에 시작하여 2007년 1월 국제회의까지 다시점 비디오 부호화의 요구사항, 부호화 조건, 테스트영상 선정, 세부 기술 제안 및 선정 등 국제 기술의 표준화를 위한 활동이 진행되었다. 그리고 향후 2008년까지 최종 국제 규격안이 제정될 예정이다.

• 전자공학회논문지C
• /
• 제34C권11호
• /
• pp.20-28
• /
• 1997

In this paper, quantization and inverse quantizatio unit, a sa component of MPEG-2 moving picture compression system, ar edesigned. In the processing of quantization, this design adopted newly designed arithmetic units in which quantization matrices and scale code was expressed with SD(signed-digit) code. In the arithmetic unit of inverse quantization, quantization scale code, which has 5-bits length, is splited into two pieces; 2-bits for control code, 3-bits for quantization data, and the method to devise quantization step size is proposed. The design was coded with VHDL and synthesis results in that it consumed about 6,110 gates, and operating speed is 52MHz.

• 전자공학회지
• /
• 제24권9호
• /
• pp.91-98
• /
• 1997

Text-to-Speech(WS) technology has been attracting a lot of interest among speech engineers because of its own benefits. Namely, the possible application areas of talking computers, emergency alarming systems in speech, speech output devices for speech-impaired, and so on. Hence, many researchers have made significant progresses in the speech synthesis techniques in the sense of their own languages and as a result, the quality of current speech synthesizers are believed to be acceptable to normal users. These are partly why the MPEG group had decided to include the WS technology as one of its MPEG-4 functionalities. ETRI has made major contributions to the current MPEG-4 775 appearing in various MPEG-4 documents with relatively minor contributions from AT&T and NW. Main MPEG-4 functionalities presently available are; 1) use of original prosody for synthesized speech output, 2) trick mode functions for general users without breaking synthesized speech prosody, 3) interoperability with Facial Animation(FA) tools, and 4) dubbing a moving/anlmated picture with lip-shape pattern informations.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 1999년도 하계종합학술대회 논문집
• /
• pp.699-707
• /
• 1999

It cannot be argued that speech is the most natural interfacing tool between men and machines. In order to realize acceptable speech interfaces, highly advanced speech recognizers and synthesizers are inevitable. Text-to-Speech(TTS) technology has been attracting a lot of interest among speech engineers because of its own benefits. Namely, the possible application areas of talking computers, emergency alarming systems in speech, speech output devices fur speech-impaired, and so on. Hence, many researchers have made significant progresses in the speech synthesis techniques in the sense of their own languages and as a result, the quality of currently available speech synthesizers are believed to be acceptable to normal users. These are partly why the MPEG group had decided to include the TTS technology as one of its MPEG-4 functionalities. ETRI has made major contributions to the current MPEG-4 TTS among various MPEG-4 functionalities. They are; 1) use of original prosody for synthesized speech output, 2) trick mode functions fer general users without breaking synthesized speech prosody, 3) interoperability with Facial Animation(FA) tools, and 4) dubbing a moving/animated picture with lib-shape pattern information.

• 보건의료산업학회지
• /
• 제4권2호
• /
• pp.33-46
• /
• 2010

In this study, we investigated web contents accessibility of 60 hospital web sites in Korea. The eight evaluation criteria were used for estimating the web contents accessibility of the web sites. These criteria were as follows: providing an alternative text, providing caption for moving picture, providing a skip navigation, usage of pop-up windows, usage of a summary or a caption tag for data table, providing a page title, providing a label for online form, and usage of java scripts. K-WAH 3.0 was used for estimating five evaluation criteria. According to Internet web contents accessibility guideline 1.0, we estimated the rest three evaluation criteria manually and described good or bad examples for the evaluation results technically. The results show that the web accessibility of hospital web sites is generally insufficient and the constant interests in improvement for accessibility are urgently needed.

• IEIE Transactions on Smart Processing and Computing
• /
• 제5권4호
• /
• pp.267-273
• /
• 2016

Hand posture recognition is an important technique to enable a natural and familiar interface in the human-computer interaction (HCI) field. This paper introduces a hand posture recognition method using a depth camera. Moreover, the hand posture recognition method is incorporated with the Moving Picture Experts Group Rich Media User Interface (MPEG-U) Advanced User Interaction (AUI) Interface (MPEG-U part 2), which can provide a natural interface on a variety of devices. The proposed method initially detects positions and lengths of all fingers opened, and then recognizes the hand posture from the pose of one or two hands, as well as the number of fingers folded when a user presents a gesture representing a pattern in the AUI data format specified in MPEG-U part 2. The AUI interface represents a user's hand posture in the compliant MPEG-U schema structure. Experimental results demonstrate the performance of the hand posture recognition system and verified that the AUI interface is compatible with the MPEG-U standard.

• 한국방송∙미디어공학회:학술대회논문집
• /
• 한국방송공학회 2012년도 하계학술대회
• /
• pp.260-261
• /
• 2012

본 논문에서는 Unified Speech and Audio Coding (USAC)에 적용된 Noise Filling의 부호화 과정에서 음질 왜곡 정도에 따라 Noise level을 설정하는 방법을 제안한다. USAC는 Moving Picture Experts Group (MPEG)에서 표준화한 최신의 음성/오디오 통합 코덱으로 현존하는 코덱 중에 최고의 성능을 가지고 있다. 하지만, 복호화기 기술만 표준화하여, 인코더를 설계하는 방법에 따라 음질의 차이가 존재한다 현재 오픈 소스 기반으로 진행되고 있는 프로젝트 JAME에서는 이러한 음질 차이를 극복하고, USAC에 적용된 핵섬 인코더 기술의 성능을 최대화 할 수 있는 여러 가지 방법을 포함하고 있다. 그 중 Noise Filling은 저 전송률 부호화 과정에서 양자화 되지 않는 스펙트럼에 대하여 일정한 noise level을 넣어 인지적으로 음질을 향상시키는 방법이다. 제안된 Noise Filling 부호화 방법은 현재 프레임의 음질 왜곡 정도를 반영하여, noise-like 신호 성분을 더욱 정교하게 부호화 할 수 있게 하였다.

• 한국방송∙미디어공학회:학술대회논문집
• /
• 한국방송공학회 1998년도 Proceedings of International Workshop on Advanced Image Technology
• /
• pp.16.2-21
• /
• 1998

Old movies are often corrupted by randomly located blotches and scratches. In this paper were present an efficient method for detection and removal of these distortions. The presented method is composed of two separate steps: the detection process and the restoration process. In the detection process, blotch locations are detected through global motion segmentation, the sequential approach to motion segmentation, a robust model-fit criterion and so on, we form the algorithm for the algorithm for the global motion segmentation tuned to the blotch detection problem. In the restoration process, the missing data of the detected blotch areas are temporally extrapolated from the corresponding image areas at the preceding or the succeeding image frame with considering the global motion segmentation results. We apply the presented method to moving image sequences distorted by artificial blotches. The method works very well and provides a subjective improvement of picture quality.

• 한국방송∙미디어공학회:학술대회논문집
• /
• 한국방송공학회 2011년도 추계학술대회
• /
• pp.99-101
• /
• 2011

MPEG-DASH(Dynamic Adaptive Streaming over HTTP)는 MPEG(Moving Picture Experts Group)에서 표준화 중인 HTTP를 이용한 적응형 비디오 스트리밍 기술이다. MPEG-DASH는 인터넷 방화벽에 의해 차단되는 RTP/UDP를 이용한 AV 스트리밍 대신 현재 HTTP/TCP를 이용하여 AV 스트리밍을 하는 추세에 맞춰 유무선 인터넷에서 망 환경 및 단말 환경에 동적 적응적으로 AV 스트리밍을 달성하기 위한 기술에 대한 표준이다. HTTP를 이용한 AV 스트리밍은 서버의 부담을 최소화하고 클라이언트의 지능적 처리에 전적으로 의존하는 스트리밍 방식이다. MPEG-DASH 클라이언트는 HTTP의 파일 전송 요청 또는 파일 일부 전송 요청만을 사용하여 스트리밍을 달성한다. 2011년 7월 제97차 MPEG 회의에서 MPEG-DASH DIS(Draft International Standard) 2차 버전이 승인되었다. 본 논문에서는 이 DIS 2차 버전에 따라 MP4 파일 포맷 기반의 MPEG-DASH 클라이언트를 구현하고 그 동작을 실험을 통해 검증하였다.