Shigeru Hirahata
Hitachi
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Featured researches published by Shigeru Hirahata.
IEEE Transactions on Consumer Electronics | 1987
Masato Suyigama; Shigeru Hirahata; Kenji Katsumata; Kazuo Ishikura; Akihide Okuda; Toshiyuki Sakamoto; Takaaki Matono; Sunao Suzuki; Isao Nakagawa; Masahiko Achiha
Though the existing TV standard (NTSC) is a highly sophisticated method to transmit a color television signal without a wide frequency bandwidth, it has some intrinsic problems as follows. (1) Cross-luminance (hanging dots) and cross-color interferences These are caused by the incompleteness of a luminance/ chrominance separation. Hanging dots interference is caused by the cross talk of the chrominance signal into the luminance signal. On the contrary, the cross-color interference is caused by the cross talk of the luminance signal into the chrominance signal. (2) Line flickering and coarse scanning line structure These are caused by interlace scanning. Line flickering is very obvious at the edge where the image changes its brightness in the vertical direction. The coarse scanning line structure can be observed in motion pictures very well because they have only 262.5 scanning lines a field.
international conference on consumer electronics | 1992
Kenji Katsumata; Shigeru Hirahata; Isao Nakagawa; H. Takada; Kei Yamashita; H. Tajima; Kazuhiro Kaizaki; Atushi Haratani; K. Ishibashi
A picture converting system that can fit input signals to a wide-aspect (16:9) display without jitter and skew was developed. The architecture of the converter and a LSI for its hardware implementation are described. In this system, the compression and enlargement for converting the image were done only by the digital signal processing circuits, and some new methods that were suitable for this digital signal processing system were adopted. This system also included features for minimizing the difference of the luminescence decay of a phosphor between the center and the side portions of the display. >
The Journal of The Institute of Image Information and Television Engineers | 1991
Shinobu Torikoshi; Shigeru Hirahata; Noboru Kojima
フィールド内処理を基本としたダウンコンバータで問題となる静止画領域での折り返し妨害について検討し, EDTVを用いてMUSE信号受信時に静止画領域での折り返し妨害を除去し, 動画・静止画とも同解像度を確保できるシステムについて提案する.
Archive | 2014
Mikine Ishiguro; Shigeru Hirahata; Hiroyuki Koreeda; Masaru Nanki
Archive | 1996
Akio Nagasaka; Takafumi Miyatake; Yoshikazu Amano; Shigeru Hirahata
Archive | 1988
Todd J. Christopher; Shigeru Hirahata
Archive | 1991
Masato Sugiyama; Shigeru Hirahata; Tohru Suzaki; Isao Nakagawa; Kenji Katsumata
Archive | 1990
Shigeru Hirahata; Shinobu Torikoshi; Toshiyuki Sakamoto; Takumi Okamura; Noboru Kojima; Tetsuo Mitsuhashi; Isao Kondo; Yuichi Ninomiya; Koichi Yamaguchi; Toshiro Ohmura
Archive | 1994
Kenji Katsumata; Shigeru Hirahata; Toshinori Murata; Haruki Takata; Shinobu Torikoshi; Takanori Eda; Kouichi Ishibashi
Archive | 1992
Haruki Takata; Kenji Katsumata; Shigeru Hirahata; Mituo Konno; Kouichi Ishibashi; Sunao Suzuki