Adaptive coefficient scanning in video coding

H - Electricity – 04 – N

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

H04N 7/26 (2006.01) H04N 7/30 (2006.01) H04N 7/34 (2006.01) H04N 7/36 (2006.01)

Patent

CA 2687253

This disclosure describes techniques for scanning coefficients of video blocks, e.g., quantized and transformed coefficients. Rather than use conventional zig-zag scanning, the techniques of this disclosure adapt the scanning order based on statistics associated with previously coded blocks that were coded in the same prediction mode. For each prediction mode, statistics of the coefficients are stored, e.g., indicating probabilities that given coefficients are zero or non-zero. Periodically, adjustments to the scanning order can be made in order to better ensure that non-zero coefficients are grouped together and zero value coefficients are grouped together, which can improve the effectiveness of entropy coding. The techniques of this disclosure provide thresholds and threshold adjustments that can reduce the frequency that the scanning order adjustments occur, yet still achieve desired improvements in compression due to such scanning order adjustments.

L'invention concerne des techniques de balayage de coefficients de blocs vidéo, par ex., de coefficients quantifiés et transformés. Plutôt que d'utiliser un balayage en zig-zag classique, les techniques de l'invention consistent à adapter l'ordre de balayage en fonction de statistiques associées à des blocs préalablement codés qui ont été codés selon le même mode de prédiction. Pour chaque mode de prédiction, des statistiques des coefficients sont stockées, par ex., indiquant des probabilités que des coefficients donnés soient égaux à zéro ou différents de zéro. Périodiquement, des ajustements de l'ordre de balayage peuvent être effectués de manière à mieux s'assurer que des coefficients différents de zéro soient regroupés et que des coefficients de valeur zéro soient regroupés, ce qui permet d'améliorer l'efficacité de codage entropique. Les techniques de l'invention permettent d'obtenir des seuils et des ajustements de seuils qui peuvent réduire la fréquence à laquelle les ajustements d'ordres de balayage se produisent, ainsi que d'obtenir des améliorations souhaitées de la compression du fait de tels ajustements d'ordres de balayage.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Adaptive coefficient scanning in video coding does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive coefficient scanning in video coding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive coefficient scanning in video coding will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-2072205

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.