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. If an interlaced picture is inputted, and the DCT mode is the field mode, an interlaced picture accommodating picture dec...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KOMORI KENJI, SATO KAZUSHI, KANEKO TETSUO, MITSUHASHI SATOSHI, YANAGIHARA NAOFUMI
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
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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. If an interlaced picture is inputted, and the DCT mode is the field mode, an interlaced picture accommodating picture decoding unit 3 executes 4x4 decimating IDCT. If the DCT mode is the frame mode, the entire coefficients of the DCT block are IDCTed for separation into two pixel blocks associated with interlaced scanning. The separated two pixel blocks are DCTed. The coefficients of the low-frequency components are IDCTed and the two pixel blocks are synthesized together. A progressive picture accommodating picture decoding unit 2 is fed with a progressive picture. The coefficients of the low-frequency components of the DCT block are inverse orthogonal transformed.