Picture decoding method and apparatus

Picture decoding method and apparatus

An MPEG downdecoder is to be provided which eliminates dephasing of pixels of moving picture data without losing properties inherent in a picture obtained on interlaced scanning. In the case of a field DCT mode, 4x4 decimating IDCT is executed for phase correction for a ¼ pixel for pixels in the ver...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: GOSEKI MASAMI, KOMORI KENJI, SATO KAZUSHI, KANEKO TETSUO, MITSUHASHI SATOSHI, YANAGIHARA NAOFUMI
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRIC DIGITAL DATA PROCESSING
ELECTRICITY
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:An MPEG downdecoder is to be provided which eliminates dephasing of pixels of moving picture data without losing properties inherent in a picture obtained on interlaced scanning. In the case of a field DCT mode, 4x4 decimating IDCT is executed for phase correction for a ¼ pixel for pixels in the vertical direction of a top field and for phase correction for ¾ pixel for pixels in the vertical direction of a bottom field. In the case of a frame DCT mode, the totality of coefficients of a DCT block are IDCTed and separated into two pixel blocks associated with interlaced scanning. The low-frequency components of these two pixel blocks are IDCTed to synthesize the two pixel blocks. The pixels in the vertical direction of the top field are phase-corrected by a ¼ pixel, while those in the vertical direction of the bottom field are phase-corrected by a ¾ pixel.