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지상파 MMS 가변 비트율 모드 방송에서 TV 채널 전환 시 발생하는 영상 표출 시간 지연의 개선
박성환(Sung-hwan Park),장해랑(Hae-rang Chang),전형준(Hyoung-joon Jeon),권순철(Soon-chul Kwon),이승현(Seung-hyun Lee) 한국디지털콘텐츠학회 2015 한국디지털콘텐츠학회논문지 Vol.16 No.5
EBS started 2HD MMS experimental broadcasting for the first time in Korea on Feb. 11, 2015. It uses the picture compression technique based on MPEG-2 CODEC, and applies the result of the experiment about variable bit rates and changes according to the scanning types, 1080i and 720p. But when changing channels, the delay in displaying picture occurs because of the operation of the variable GOP on MMS broadcasting, which optimizes image quality by application variable bit rates. In this study, verified the relationship between the decoding time of I frames and the GOP set in the encoding step by experimenting and analyzing ON-AIR TS. By using the verification data and adjusts the Encoder GOP parameters, improved the different video display time delays according to the scanning mode 1080i and 720p.
MPEG-2 기반 지상파 2HD 서비스를 위한 주사 방식별 객관적 화질 측정 및 시험방송 적용 연구
박성환(Sung-hwan Park),장해랑(Hae-rang Chang),이종수(Jong-su Lee),권순철(Soon-chul Kwon),이승현(Seung-hyun Lee) 한국디지털콘텐츠학회 2015 한국디지털콘텐츠학회논문지 Vol.16 No.2
Since starting of terrestrial digital broadcasting in 2001, there has been discussion on introduction of multiple broadcasting services, one of advantages of digital broadcasting. In the mean time, task force on terrestrial multiple channel experimental broadcasting was formed with government organizations, broadcasting companies and household appliance companies in Oct. 2013, and terrestrial multiple channel experimental broadcasting was started between Jan. to April, 2014. Based on this experimental result, EBS started 2HD MMS experimental broadcasting first in Korea on Feb. 11, 2015. This study was carried out in consideration of operation of 2 HD channels in existing 6MHz bandwidth based on MPEG-2 codec with development of compression technology. A study on image quality optimization was carried out and applied to 2HD MMS experimental broadcasting through application experiment of variable bit rate and change according to 1080i and 720p scanning type.