Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 1-12 |
| Number of pages | 12 |
| Journal | Electronics and Communications in Japan (Part I: Communications) |
| Volume | 76 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 1993 |
| Externally published | Yes |
Keywords
- compatibility
- HDTV
- lapped transforms
- orthogonal transforms
- Video coding
ASJC Scopus subject areas
- Computer Networks and Communications
- Electrical and Electronic Engineering