QUANTIZATION MATRIX COMPRESSION IN VIDEO CODING

摘要

A method of quantization matrix compression in a video encoder is provided that includes preprocessing a quantization matrix by performing at least one selected from down-sampling the quantization matrix and imposing 135 degree symmetry on the quantization matrix, performing zigzag scanning on the pre-processed quantization matrix to generate a one dimensional (1D) sequence, predicting the 1D sequence to generate a residual 1D sequence, and coding the residual 1D sequence using kth order exp-Golomb coding to generate a compressed quantization matrix, wherein k≧0.

主权项

1. A method of decoding an encoded video bit stream, comprising:
entropy decoding the encoded video bit stream resulting in a plurality of decoded video bits comprising a plurality of quantized transform coefficients; upsampling a first quantization matrix of a first size to form a second quantization matrix of a second size wherein the second size is larger than the first size; performing an inverse quantization operation on the plurality of quantized transform coefficients using the second quantization matrix resulting in a plurality of transform coefficients; and performing an inverse transform operation on the plurality of transform coefficients to form a plurality of reconstructed non-over-lapping blocks.