Multiple description coding communication system

H - Electricity – 04 – L

Patent

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H04L 1/00 (2006.01) H03M 7/40 (2006.01) H04L 1/22 (2006.01) H04N 1/41 (2006.01)

Patent

CA 2226241

A multiple description coder pairs two samples and transforms the samples prior to quantizing and entropy encoding to improve coding efficiency while simultaneously achieving satisfactory performance with regard to distortion. For the N-Sample case, the multiple description coder pairs the samples using two different algorithms, and then performs the pairing transformation of the two variable case. One method assigns the lowest energy coefficients with the highest energy coefficients and so on until the middle coefficients are paired with each other.Another method assigns the highest energy coefficient with coefficients having energy below some predetermined value. Image coders and decoders are also included. A method for classifying the coefficients prior to performing the pairing transform is disclosed, which classifies the coefficients according to the amount and location of their energy.

Un décodeur de description multiple apparie deux échantillons et les transforme avant quantification et codage entropique afin d'améliorer l'efficacité du codage tout en permettant une performance satisfaisante en ce qui concerne la distorsion. Dans le cas de N échantillons, le codeur de description multiple apparie les échantillons en utilisant deux algorithmes différents, puis exécute la transformation d'appariement du cas à deux variables. Une méthode associe le coefficient d'énergie le plus bas au coefficient d'énergie le plus élevé et continue ainsi jusqu'à ce que les coefficients médians soient appariés l'un à l'autre. Une autre méthode associe le coefficient d'énergie le plus élevé aux coefficients d'énergie inférieurs à une valeur prédéterminée. Des codeurs et des décodeurs d'images sont également compris. Une méthode de classification des coefficients avant l'exécution de la transformation d'appariement assure la classification des coefficients selon le niveau et la localisation de leur énergie.

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