Video encoding by filter selection

摘要

A method and a device are described for selecting between multiple available filters in an encoder to provide a frame having a low error and distortion rate. For each full and sub pixel position, determining whether to use an alternative filter over the default filter during interpolation by estimating the rate distortion gain of using each filter and signaling to the decoder the optimal filter(s) applied to each full and sub-pixel position. In one embodiment, identifying a reference frame and a current frame, interpolating the reference frame using a default filter to create a default interpolated frame, interpolating the reference frame using an alternative filter to create an alternative interpolated frame, determining for each sub-pixel position whether to use the default filter or the alternative filter based on a minimal cost to generate a final reference frame.

主权项

1. A method of encoding digital video, the method comprising:
identifying a reference frame and a current frame; interpolating blocks of the reference frame using a plurality of filters, wherein the interpolated blocks are used for predicting video blocks of the current frame, wherein the plurality of filters comprises one or more default filters and one or more alternative filters for each of a plurality of sub-pixel positions, wherein the one or more alternative filters comprise adaptive interpolation filters; and determining, for each of the plurality of sub-pixel positions of the interpolated blocks, whether to use one of the one or more default filters or one of the one or more alternative filters, based on a lower sum error to generate a block of a final frame, wherein determining whether to use the one of the one or more default filters or the one of the one or more alternative filters is implemented using a non-exhaustive solution that does not consider all possible combinations of the one or more default filters and the one or more alternative filters for each of the plurality of sub-pixel positions of the interpolated blocks.