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Machine translation
1. (WO1980000646) IMAGE CODING BY SELECTIVE ADDITION OF PSEUDO-RANDOM NOISE TO PORTIONS OF VIDEO SIGNAL
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/000646    International Application No.:    PCT/US1979/000729
Publication Date: 03.04.1980 International Filing Date: 14.09.1979
IPC:
G06T 9/00 (2006.01), H04N 7/26 (2006.01), H04N 7/46 (2006.01)
Applicants:
Inventors:
Priority Data:
943523 18.09.1978 US
Title (EN) IMAGE CODING BY SELECTIVE ADDITION OF PSEUDO-RANDOM NOISE TO PORTIONS OF VIDEO SIGNAL
(FR) CODAGE D"IMAGE PAR ADDITION SELECTIVE DE PSEUDO-BRUIT DE FOND A DES PARTIES D"UN SIGNAL VIDEO
Abstract: front page image
(EN)Processing of digitally-coded pictures to improve perceived quality without increasing transmission channel capacity, featuring dividing the video signal into low, middle and high frequency signals (16, 26), finely quantizing the low frequency signal (18), adding pseudo-random noise (33) to the middle frequency signal prior to quantizing (28), enhancing (36) and adding pseudo-random noise (48) prior to coarsely quantizing (50) the high frequency signal. The pseudo-random noise signals are subtracted (37, 52) from the respective signals at the receiver.
(FR)Un traitement d"images codees numeriquement pour ameliorer la qualite percee sans augmenter la capacite des canaux de transmission, consiste a diviser le signal video en des signaux de basse, moyenne et haute frequence (16, 26), a quantifier finement le signal de basse frequence (18), a ajouter un pseudo-bruit de fond (33) au signal de frequence moyenne avant la quantification (28), a augmenter (36) et ajouter un pseudo-bruit de fond (48) avant de quantifier grossierement (50) le signal de haute frequence. Les signaux de pseudo-bruit de fond sont soustraits (37, 52) des signaux respectifs dans le recepteur.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)