Low noise encoding and decoding method

H - Electricity – 04 – N

Patent

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Details

H04N 7/26 (2006.01) H04N 5/14 (2006.01) H04N 7/30 (2006.01) H04N 7/46 (2006.01) H04N 7/50 (2006.01) H04N 5/44 (2006.01)

Patent

CA 2315016

An adaptive digital image processor (22) precedes an MPEG2 encoder (24). The processor receives a high definition (1920 by 1080 pixels per image) video signal intended for broadcast or storage, and adaptively low-pass filters the signal. The signal is subjected to low-pass two-dimensional filtering (223) to eliminate encoding artifacts and related noise. The video signal is then horizontally down-sampled (226) to create a lower resolution hybrid signal (1280 by 1080 pixels per image). A receiver decodes and decompresses the hybrid signal. The hybrid signal is upsampled to its original resolution using existing hardware and software with a software modification.

Selon l'invention, un processeur d'images numériques adaptatif (22) précède un codeur MPEG2 (24). Ledit processeur reçoit un signal vidéo de haute définition (1920 par 1080 pixels par image), qui est destiné à être diffusé ou stocké, et fait subir à ce signal un filtrage passe-bas adaptatif. Le signal est soumis à un filtrage bidimensionnel passe-bas (223) pour que les artéfacts de codage et le bruit associé soient éliminés. Le signal vidéo est ensuite échantillonné à la baisse (226) horizontalement pour donner un signal hybride d'une plus basse définition (1280 x 1080 pixels par image). Un récepteur décode et décomprime le signal hybride. Ce signal hybride est échantillonné à la hausse pour être ramené à sa définition d'origine au moyen d'un matériel existant et d'un logiciel modifié.

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