Video coding methods and apparatus

摘要

In methods for encoding and decoding digital pictures certain prediction parameters may be omitted from the output on the encoder side or the input on the decoder side. An encoder can identify prediction parameter values that can be omitted by determining whether a decoder emulator can reproduce the prediction parameter values from other information, such as predicted pixel and prediction error values of one or more previously decoded sections from the same or a different picture.

主权项

1. A method for encoding a current section of a digital picture, comprising:
a) generating a set of transform coefficients from a set of prediction errors for a current section of a picture using an encoder device; b) determining a first set of one or more prediction parameter values for the current section of the digital picture using the encoder device; c) determining a second set of one or more prediction parameter values for the current section of the digital picture with a decoder emulator using predicted pixel and prediction error values of one or more previously decoded sections, wherein the determining the second set includes, with the decoder emulator, applying an inverse transform to the set of transform coefficients to re-generate the set of prediction errors for the current section; d) comparing the first set of prediction parameters with the second set of prediction parameters to identify one or more prediction parameter values common to the first set and the second set; z) identifying a third set of prediction parameter values, the third set of prediction parameter values being selected from the first set but omitting the prediction parameter values common to the first set and the second set; and e) transmitting, into a compressed stream for a decoder, the set of transform coefficients and the third set of prediction parameter values with the prediction parameter values common to the first set and the second set omitted from the compressed stream.