Methods and devices for encoding and decoding transform domain filters

摘要

Methods and devices for encoding and decoding data using transform domain filtering are described. The encoder determines a set of transform domain filter coefficients to be applied to a transform domain prediction. The filtering may, in some cases, also apply to transform domain reconstructions. Rate-distortion optimization may be used to determine the optimal filter coefficients on a frame-basis, coding-unit-basis, or other basis. Multiple filters may be developed and communicated from the encoder to the decoder for different combinations of transform block size, coding mode, prediction mode, and texture type. In other cases, the filtering is applied in the pixel-domain to a pixel-domain prediction or a pixel-domain reconstruction of a block of samples.

主权项

1. A method of encoding a block of samples in an encoder, the method comprising:
determining a prediction block for predicting the block of samples; spectrally transforming the block of samples to generate a transformed original block of samples; spectrally transforming the prediction block to generate a transformed prediction block; determining a set of filter coefficients based the transformed prediction block and the transformed original block of samples; and encoding the set of filter coefficients and a quantized transformed residual block in a bitstream of encoded data, whereby the set of filter coefficients are used for transform domain filtering during reconstruction of the block of samples.