Interpolation filter selection using prediction unit (PU) size

An apparatus configured to decode video content, the apparatus comprising:

• one or more computer processors;
• and
• a computer-readable storage medium comprising instructions for controlling the one or more computer processors to be operable to:
• receive, at a decoder, a mapping between interpolation filters in the set of interpolation filters and sizes of different prediction units within the video content;
• receive, at the decoder, a first prediction unit of video content without receiving a signal from an encoder as to which interpolation filter was determined to interpolate a sub-pel pixel value for use in a temporal prediction process for the first prediction unit;
• determine a size of the first prediction unit;
• determine, at the decoder, an interpolation filter using the set of interpolation filters to interpolate the sub-pel pixel value for use in the temporal prediction process for the first prediction unit by comparing the size of the first prediction unit to the mapping to select the interpolation filter in the set of interpolation filters associated with the size of the first prediction unit in the mapping;
• and
• decode the first prediction unit using the temporal prediction process.

A non-transitory computer-readable storage medium comprising instructions for encoding video content, the instructions for controlling the one or more computer processors to be operable to:

• determine a mapping between interpolation filters in a set of interpolation filters and sizes of different prediction units within the video content, the set of filters for use in interpolating sub-pel pixel values;
• receive, at an encoder, a first prediction unit of the video content;
• determine a size of the first prediction unit;
• determine, at the encoder, an interpolation filter in the set of interpolation filters to interpolate a sub-pel pixel value for use in a temporal prediction process for the first prediction unit by comparing the size of the first prediction unit to the mapping to select the interpolation filter in the set of interpolation filters associated with the size of the first prediction unit in the mapping;
• encode the first prediction unit using the temporal prediction process;
• transmit the mapping between the interpolation filters and the sizes from the encoder to a decoder;
• and
• transmit, from the encoder to the decoder, the first prediction unit as encoded without signaling to the decoder which interpolation filter was determined to interpolate the sub-pel pixel value.