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Wavelet 변환을 이용한 PDA에서의 저 비트율 영상 압축
엄유열,최명환 강원대학교 정보통신연구소 2002 정보통신논문지 Vol.6 No.-
There are existing MPEG series and H.26x series that are used for low bit rate transmission in wireless internet environment but these compression algorithm uses block based DCT transformation so blocking effect occurs when used at low bit rates. Also, with the low capability of hardwares such as PDA which is usually used in the wireless internet environment, the video coding is impossible in real-time. In this paper, we avoided MC(motion compensation) algorithm to reduce the amount of calculation and to achieve a simplified algorithm. We used 3-Level wavelet transformation to remove blocking effect. We computed difference image between reference image and current image to reduce temporal redundancy and constructed GOF(Group Of Frames). Then, we performed scalar quantization. We consider each subband's directional characteristic then encode GOF along the time axis.
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무선 인터넷 기반의 POI 정보 서비스를 위한 개인 항법 시스템 브라우저 구현
이근,엄유열,최명환,박홍성 강원대학교 정보통신연구소 2002 정보통신논문지 Vol.6 No.-
This paper presents a design and implementation of a Personal Navigation System Browser for POI services for portable PDA(Personal Digital Assistants). Personal Navigation System(PNS) service is a location based geographic information service for PDA or cellular telephone. Point of Interest(POI) is the information about a user's personal interests. PNS Browser is a PNS application which receives and displays POI information as well as location based geographic information service. In this paper, a PNS Browser is proposed and its implementation is presented that contains CHtml Web Browser and POI manager as well as the Map display by using wireless internet technology.
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