| 摘要 |
The present invention relates to hybrid video coders and decoders that employ motion compensated prediction with fractional-pel resolution and provides a method for employing an adaptive interpolation filter that optimizes the trade-off between prediction accuracy and signalling overhead. To this end, properties such as symmetries and other limitations of the adaptive interpolation filter are set beforehand. In this manner, the number of independent filter coefficients may be controlled. The filter coefficients for adaptive interpolation are then determined in accordance with the set filter properties. In order to allow the decoder to apply the very same interpolation for motion compensated prediction, the filter coefficients are signalled to the decoder. Signalling overhead is reduced by also encoding the coefficients in accordance with the set filter properties. |
