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Predecessor
22.19
Displaying 1-8 of 8 articles from this issue
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Article type: Cover
Pages Cover1-
Published: March 17, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (14K) -
Article type: Index
Pages Toc1-
Published: March 17, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (31K) -
Yoshimichi Ohtsuka, Masaaki Kurozumi, Kikufumi Kanda, Yukihiro Nishida ...Article type: Article
Pages 1-6
Published: March 17, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe MPEG-2 MP@HL has been adopted as the method for video coding HDTV digital broadcasting signals, however further improvements to the quality of coded pictures are being sought before the start of broadcasting. The authors propose a method by which the amount of generated information of motion vectors can be reduced by suitably arranging these vectors. The presentation compares this approach with the conventional motion vector detection method currently used in TM5,and reports on the algorithm of the new method for picture quality improvement.View full abstractDownload PDF (652K) -
Toshiaki SHIMADA, Hideo OHIRA, Tadashi KASEZAWA, Kenicni ASANOArticle type: Article
Pages 7-12
Published: March 17, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe proposed to control an amount of code for video coding. First of all, characteristics of a video sequence to be coded are extracted. And then, a ratio of an average target quantizer step size is adaptively changed which is based upon the characteristics to each coding picture type. This paper shows the comparison of the simulation results between the proposed means and MPEG2 Test Model TM5.View full abstractDownload PDF (582K) -
Eisuke Nakasu, Yasumasa Nakata, Joji Urano, Tsutomu ShimizuArticle type: Article
Pages 13-18
Published: March 17, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn Japan, digital broadcasting services via BS are planned to start in 2000. To consider sufficient bandwidth for the transmission, the ARIB carried out subjective assessment tests for existing hardware codecs compliant with the MPEG-2 Main Profile. This paper describes the procedure of the picture quality evaluation for digitally coded picture and shows the results of the subjective assessment tests. The results ahow that approximately 22 Mbps for HDTV and 8Mbps for SDTV are appropriate bit rates for digital broadcasting.View full abstractDownload PDF (712K) -
Miwa KATAYAMA, Hiroyuki IMAIZUMI, Yuuji NOJIRI, Susumu ITOUArticle type: Article
Pages 19-24
Published: March 17, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper reports the results of a subjective assessment for stereoscopic HDTV coding using MPEG2 MVP@HL, which is a standard for stereoescopic television coding. The results of assessment for coding images of MVP are compared with those of coding images of simulcast, left and right image of which are each coded using conventional MP@HL. The image quality of MVP coding is almost as same as, or is higher than that of simulcast coding. According to the test of bit allocation to left and right images, an adaptive bit allocation depending on image contents can improve the subjective image quality.View full abstractDownload PDF (806K) -
Hiroyuki FUKUMORI, Syu TOMIYA, Yuuji HIGUCHIArticle type: Article
Pages 25-30
Published: March 17, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe coded OFDM (Orthogonal Frequency Division Multiplexing) system minimizes the effect of multipath mobile channels by using the time interleaving. But at lower speed there is possibility that a fade duration is longer than the time interleaving depth, and the time interleaving is not effective enough. Recently we proposed the SCN (Single Channel Network) system using a frequency diveraity technique for mobile reception. This paper describes the experimental results that the frequency diversity technique improves BER performances even at lower speed.View full abstractDownload PDF (521K) -
Article type: Appendix
Pages App1-
Published: March 17, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (71K)
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