(19)
(11) EP 1 599 047 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A2)

(48) Corrigendum issued on:
11.01.2006 Bulletin 2006/02

(43) Date of publication:
23.11.2005 Bulletin 2005/47

(21) Application number: 05017431.7

(22) Date of filing: 14.04.1998
(51) International Patent Classification (IPC): 
H04N 7/26(1995.01)
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 17.04.1997 JP 10011297
27.08.1997 JP 23142197

(62) Application number of the earlier application in accordance with Art. 76 EPC:
98106757.2 / 0873016

(71) Applicant: SHARP KABUSHIKI KAISHA
Osaka (JP)

(72) Inventors:
  • Hibi, Keiichi
    Matsudo-shi Chiba (JP)
  • Sato, Seiji
    Toride-shi Ibaraki (JP)

(74) Representative: Müller - Hoffmann & Partner 
Patentanwälte, Innere Wiener Strasse 17
81667 München
81667 München (DE)

 
Remarks:
This application was filed on 10-08-2005 as a divisional application to the application mentioned under INID code 62.
 


(54) Video (de)coding device with frequency band retransmission


(57) A video-coding device and a video-decoding device, which are capable of assuring the necessary quality of a video sequence even if a transmission error and/or a loss of information occurs in a transmission line and preventing the propagation of decoding error to subsequent images, and can effectively retransmit the necessary coded information when a transmission error and/or a loss of information occurs in a transmission line. A motion-compensated interframe-predicting portion (301) predicts an input image by using a preceding decoded image stored in a frame memory portion (302) and outputs motion vectors. A difference calculating portion (303) determines a difference between the input image signal and the predicted image signal and outputs the difference as a prediction-error signal to a band-dividing portion (304) which in turn divides the prediction-error signal into n hierarchical layers of frequency-band-components and outputs them to respective coding portions (305a to 305n). A loop-back control portion (307) decides whether each of the coded frequency-band-components of the coded prediction-error signal from respective coding portions is input to a synthesizing portion (309) and outputs a decoded prediction-error signal. The predicted image signal and the decoded prediction-error signal are combined to generate a decoded image signal corresponding to the input image. The decoded image signal is used for prediction of a subsequent input image. A motion-compensated interframe-predicting portion (901) predicts an input image by using a preceding decoded image stored in a frame memory portion (902) and outputs motion vectors. A difference calculating portion (903) determines a difference between the input image signal and the predicted image signal and outputs the difference as a prediction-error signal to a band-dividing portion (904) which in turn divides the prediction-error signal into n hierarchical layers of frequency-band-components and outputs them to respective coding portions (905a to 905n) for quantizing and encoding the respective components. Buffer portions (906a to 906n) store the coded information and output the information to an external circuit. The buffers output respective frequency-band-components of the coded information according to retransmission request signals from a retransmission control portion (910).