METHOD AND DEVICE FOR ARITHMETIC CODING OF VIDEO, AND METHOD AND DEVICE FOR ARITHMETIC DECODING OF VIDEO

摘要

Methods and apparatuses for arithmetic encoding/decoding of video data. The arithmetic decoding method includes arithmetically decoding prefix bit strings representing a two-dimensional location of a last significant coefficient in a block sequentially by using a context model, arithmetically decoding suffix bit strings in a bypass mode, and performing inverse binarization on the arithmetically decoded prefix bit strings and suffix bit strings to acquire the location of the last significant coefficient in the block.

主权项

1. An apparatus for decoding a video, the apparatus comprising:
a syntax element decoder configured to obtain an x coordinate prefix bitstring of a last significant coefficient in a transformation block by performing context-based-arithmetic decoding on a bitstream, obtain a y coordinate prefix bitstring of the last significant coefficient by performing context-based-arithmetic decoding on the bitstream, obtain an x coordinate suffix bitstring of the last significant coefficient by performing bypass mode decoding on the bitstream, obtain a y coordinate suffix bitstring of the last significant coefficient by performing bypass mode decoding on the bitstream, obtain an inverse-binarized x coordinate prefix, an inverse-binarized x coordinate suffix, an inverse-binarized y coordinate prefix and an inverse-binarized y coordinate suffix by performing inverse binarization on the x coordinate prefix bitstring, the x coordinate suffix bitstring, the y coordinate prefix bitstring and the y coordinate suffix bitstring, reconstruct an x coordinate of the last significant coefficient based on the inverse-binarized x coordinate prefix and the inverse-binarized x coordinate suffix, and reconstruct a y coordinate of the last significant coefficient based on the inverse-binarized y coordinate prefix and the inverse-binarized y coordinate suffix, wherein, after the x coordinate prefix bitstring and the y coordinate prefix bitstring are obtained via the context-based-arithmetic decoding, the x coordinate suffix bitstring and the y coordinate suffix bitstring are obtained via the bypass mode decoding.