PostScript (43 KB)Compatible Coding of Digital Interlaced HDTV Using Prediction of the Even Fields from the Odd Fields
Proceedings, 4th International Workshop on HDTV and Beyond, Torino, Italy,
September 1991
Reprinted in "Signal Processing of HDTV", III, H. Yasuda
and L. Chiariglione, Eds., Elsevier, 1992
Abstract
A high-compression technique is presented for coding digital interlaced HDTV. A key feature of the method consists of coding the even fields using information from the neighboring odd fields, which have been coded first with an MPEG-type technique. This approach, first proposed in [1,2], was originally designed to aid development of MPEG-2 coding techniques of CCIR-601 video, compatible with the MPEG-1 video coding standard [3]. The same approach can also facilitate the design of HDTV/Standard TV compatible coding.
In this paper, we outline two coding schemes that are based on this idea of field separation. One of them aims at optimizing the coding performance for HDTV and is noncompatible, allowing occasional joint coding of the two fields. The other is compatible with Standard TV and also considers the problem of horizontal resolution mismatch; it aims at optimizing coding of HDTV, while reducing error propagation in standard TV coding by use of predictive leak in the DCT domain.
These methods are appropriate for digital interlaced HDTV coding, including possible terrestrial and satellite transmission applications. The even fields are coded with a digitally assisted multi-mode hybrid interpolative/recursive technique, using both predictive (hence recursive) and interpolative modes of operation. Of particular importance is the use of a combined hybrid recursive/interpolative mode. The technique provides for convenient multiresolution channel coding for graceful degradation in the presence of channel errors.