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H.264/AVC 비트스트림으로부터 빠른 축소 영상 추출방법
윤명근(Myung-Keun Yoon),유상준(Sang-Jun Yu),김은석(Eun-Seok Kim),오승준(Seung-Jun Oh) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
In this thesis, we proposed a theoretical method for extracting the thumbnail directly form H.264/AVC bitstreams witch can calculate only DC values in the integer transform domain without fully decoding those bitstreams. The thumbnail can be extracted at the average PSNR level of about 35㏈, which is very reasonable quality for practical use. The proposed method can reduce 47.5% of extracting time on average.
H.264/AVC 비트스트림으로부터 썸네일 추출 시 효율적인 오차 보상 방법
윤명근(Myung-Keun Yoon),이여송(Yeo-Song Lee),손채봉(Chae-Bong Sohn),박호종(Ho-Chong Park),안창범(Chang-Beom Ahn),오승준(Seoung-Jun Oh) 한국방송·미디어공학회 2008 방송공학회논문지 Vol.13 No.5
Recently, high definition media services like HDTV and IPTV are growing. A fast reduced-size image extracting method is required to meet what those services require. Conventional DC image extracting methods, however, can't be applied to H.264/AVC streams since a spatial domain prediction scheme is adopted in H.264/AVC intra mode. To solve this problem, a thumbnail extraction method in H.264/AVC was proposed. However, the method has mismatch problem which was caused by round-off operation in intra prediction and mismatch between integer and floating point calculation. In this paper, we propose an error compensation method for extracting thumbnail directly in H.264/AVC bitstreams. The compensation method introduces the mismatch problem in thumbnail extraction and presents compensation values. Through the implementation and performance evaluation, proposed method compensated round-off error efficiently in D1 and HD sequences while the additional extraction time is negligible.
유혜리 ( Hye Rhee Yoo ),윤명근 ( Myung Keun Yoon ),박영한 ( Young Han Park ),박혜림 ( Hye Rim Park ),장봉림 ( Pong Rheem Jang ) 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.9
목적 : 본 연구는 난소암 세포에서 면역조직화학적 염색을 이용하여 FSH 및 LH 수용체의 발현 빈도를 조사하고 난소암 환자에서의 혈중 성선자극호르몬의 농도를 측정하여 난소암 발생과 성선자극호르몬에 대한 관계를 알아보고자 하였다. 연구 방법 : 2002년 1월부터 2003년 7월까지 한림대학교병원 산부인과에 내원하여 난소 종양으로 진단받은 25명의 환자에게서 전자궁 적출술과 양측 부속기 절제술을 통해 난소암 조직을 얻어 면역조직화학적 염색을 시행하였다. Objective : We performed immunohistochemistry for the evaluation of follicle stimulating hormone receptor (FSHR), luteinizing hormone receptor (LHR) expression in the ovarian tumors and examined the blood level of the gonadotropins in ovarian cancer patie
H.264/AVC 비트스트림에서 효율적으로 축소 영상을 추출 하는 방법
유상준(Sang-Jun Yu),윤명근(Myung-Keun Yoon),김은석(Eun-Seok Kim),손채봉(Chae-Bong Sohn),심동규(Dong-Gyu Sim),오승준(Seoung-Jun Oh) 한국방송·미디어공학회 2008 방송공학회논문지 Vol.13 No.2
Recently, as growing of high definition media services like HDTV and IPTV, fast moving picture manipulation techniques need to meet what those services require. Especially, a fast reduced-size image extracting method is required in the areas of video indexing and video summary. Conventional DC image extracting methods, however, can't be applied to H.264/AVC streams since a spatial domain prediction scheme is adopted in H.264/AVC intra mode. In this paper, we propose a theoretical method for extracting a thumbnail image from an H.264/AVC intra frame in the frequency domain. Furthermore, the proposed scheme can extract the thumbnail very fast since all operations are applied to transform coefficients directly, after a general equation for the thumbnail extraction in nine H.264/AVC intra prediction modes is introduced, an LUT(Look Up Table) for each mode is designed. Through the implementation and performance evaluation, while the subject quality difference between the output of our scheme and a conventional output is negligible, the former can extract the thumbnail faster then the latter by up to 63%.