ADAPTIVE COEFFICIENT SCANNING FOR VIDEO CODING

摘要

This disclosure describes techniques for scanning coefficients of video b locks. In particular, the techniques of this disclosure adapt a scan order u sed to scan a two dimensional block of coefficients into a one dimensional c oefficient vector based on statistics associated with one or more previously coded blocks. For example, statistics that indicate the likelihood that a g iven coefficient value in each position of a two dimensional block is zero o r non zero may be collected for one or more previously coded blocks. At some point, an adjustment to the scan order can be made in order to better ensur e that non-zero coefficients are grouped together near the front of the one dimensional coefficient vector, which can improve the effectiveness of entro py coding. The collection of statistics and adjustment of scan order may be made separately for each possible prediction mode.