Picture decoding method and apparatus

Picture decoding method and apparatus

1. Field of the Invention An MPEG downdecoder is to be provided which eliminates pixel dephasing with the field DCT mode and the frame DCT mode without detracting from picture characteristics proper to interlaced pictures. To this end, a decimating IDCT unit effectuates 4×4 decimating IDCT if the DC...

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Bibliographische Detailangaben
Hauptverfasser: Sato, Kazushi, Komori, Kenji, Kaneko, Tetsuo, Mitsuhashi, Satoshi, Goseki, Masami, Terao, Takao, Yanagihara, Naofumi
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:1. Field of the Invention An MPEG downdecoder is to be provided which eliminates pixel dephasing with the field DCT mode and the frame DCT mode without detracting from picture characteristics proper to interlaced pictures. To this end, a decimating IDCT unit effectuates 4×4 decimating IDCT if the DCT mode is the field mode. If the DCT mode is a frame mode, a decimating IDCT unit effectuates IDCT on the totality of coefficients of a DCT block to separate the coefficients into two pixel blocks associated with interlaced scanning. The decimating IDCT unit executes DCT on the separated two pixel blocks. The low-frequency components of the two pixel blocks are processed with IDCT and the two pixel blocks are synthesized.