公开(公告)号：US20220286144A1

公开(公告)日：2022-09-08

申请号：US17826540

申请日：2022-05-27

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： BIN LI ,  Jiaqi Gu

IPC: H03M13/07 ,  H03M13/00

Abstract: This application discloses a polar code encoding method and apparatus, which can improve encoding performance through codeword construction. The method includes: obtaining K information bits to be encoded, where K is a positive integer; determining a first bit sequence based on the K information bits to be encoded, where a length of the first bit sequence is N, the first bit sequence includes fixed bits and the K information bits to be encoded, and the K information bits to be encoded may further include a check bit; determining a second bit sequence based on the first bit sequence and an upper triangular matrix, where the upper triangular matrix is a matrix having N rows and N columns, and the upper triangular matrix may be an upper triangular Toeplitz matrix; and performing polar code encoding on the second bit sequence to obtain and output an encoded sequence.

公开(公告)号：US20220174329A1

公开(公告)日：2022-06-02

申请号：US17674676

申请日：2022-02-17

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： BIN LI ,  Ling LIU ,  Hui SHEN ,  Jiaqi GU

IPC: H04N19/93 ,  H04N19/124 ,  H04N19/91

Abstract: This application discloses an image encoding method and apparatus, an image decoding method and apparatus, and a chip. In the encoding method, first, a run-length value sequence and a level value sequence are obtained by using a quantized sequence of an image; updated distribution probabilities of level values are obtained based on distribution probabilities of run-length values and the level values and according to a mapping rule; finally, entropy encoding is performed based on the level value sequence and the updated distribution probabilities of the level values, to output encoded image data. A decoder side only needs to additionally learn of the mapping rule to complete decoding. The method is simple to implement, and can improve image compression efficiency and effectively reduce an amount of data for representing the image.