DCT mode conversions for field/frame coded MPEG video

Author

Vasudev, Bhaskaran ; Merhav, Neri

Author_Institution

Epson Palo Alto Lab., CA, USA

fYear

1998

fDate

7-9 Dec 1998

Firstpage

605

Lastpage

610

Abstract

Several compressed-domain based processing methods such as video downscaling, filtering, inverse motion compensation, etc. have been developed for MPEG compressed digital video. These processing methods assume that the underlying MPEG video was coded in only one mode, namely, frame or field mode. In order to support both frame and field-mode coded video, in this paper, we present a fast algorithm for converting a sequence of DCT blocks in the field mode to a sequence of blocks whose DCT´s represent frame-mode coding. A multiplier-free implementation for this algorithm is also developed in this paper. In a typical coding setup, used in MPEG-2, simulations indicate that the image quality degradations resulting from the multiplier-free implementation is around 0.5-1.0 dB; however, a factor of two speedup is obtained compared with a traditional spatial-domain approach

Keywords

discrete cosine transforms; transform coding; video coding; 0.5 to 1.0 dB; DCT blocks; DCT mode conversions; MPEG compressed digital video; compressed-domain based processing methods; field mode; field/frame coded MPEG video; filtering; frame mode; inverse motion compensation; multiplier-free implementation; video downscaling; Degradation; Digital filters; Discrete cosine transforms; Filtering; Image coding; Image converters; Image quality; Motion compensation; Transform coding; Video compression;

fLanguage

English

Publisher

ieee

Conference_Titel

Multimedia Signal Processing, 1998 IEEE Second Workshop on

Conference_Location

Redondo Beach, CA

Print_ISBN

0-7803-4919-9

Type

conf

DOI

10.1109/MMSP.1998.739047

Filename

739047