抄録
This paper describes an HDTV/TV compatible coding method based on lapped orthogonal transform (LOT). With this method, TV signals are obtained by performing N/2‐point inverse LOT to low‐order N/2 coefficients. It is shown that the LOT domain decimation reduces the aliasing noise in TV images more efficiently than the DCT‐based method. In addition, intrafield/inter‐frame adaptive LOT coding is examined. The experimental results show that the coding efficiency of intrafield/interframe adaptive LOT coding is higher than that of intrafield/interframe adaptive DCT coding. LOT coding improves the SNR by 1 dB in fixed bit rate HDTV coding at 130 Mb/s. By using LOT as a decimation filter as well as a bit rate reduction algorithm in compatible HDTV coding, the quality of the TV images and the coding efficiency are better than with the DCT‐based method.
| 本文言語 | English |
|---|---|
| ページ（範囲） | 1-12 |
| ページ数 | 12 |
| ジャーナル | Electronics and Communications in Japan (Part I: Communications) |
| 巻 | 76 |
| 号 | 4 |
| DOI | |
| 出版ステータス | Published - 1993 |
| 外部発表 | はい |
ASJC Scopus subject areas
- コンピュータ ネットワークおよび通信
- 電子工学および電気工学