Method and apparatus for coding matrix and method and apparatus for decoding matrix

A method for decoding a matrix for a video signal, the method comprising:

• determining a decoding order corresponding to a matrix set and a corresponding sampling method;
• decoding a bit stream to obtain an indicator bit for indicating whether a current matrix uses a sampling matrix;
• when the indicator bit indicates that the current matrix uses a sampling matrix, using a sampling matrix, which is obtained by performing sampling processing on a decoding reconstruction matrix of a matrix decoded in the decoding order before the current matrix, as a decoding reconstruction matrix of the current matrix;
• and
• when the indicator bit indicates that the current matrix uses no sampling matrix, directly decoding the bit stream to obtain the decoding reconstruction matrix of the current matrix;
• and
• obtaining, through decoding, all decoding reconstruction matrices of all matrices in the matrix set in the decoding order one by one.

An apparatus for decoding a matrix for a video signal, the apparatus comprising:

• a layer quantity decoding module, configured to decode a bit stream to obtain a layer number of a highest layer that is coded of a matrix;
• a first reconstructing module, configured to obtain, according to the layer number of the highest layer that is coded and coded data of each layer in the matrix that has a layer number less than or equal to the layer number of the highest layer that is coded, wherein the coded data is obtained by decoding the bit stream, a matrix element reconstruction value corresponding to each layer having the layer number less than or equal to the layer number of the highest layer that is coded in an order of layers one by one;
• and
• a second reconstructing module, configured to obtain, by performing a calculation on the matrix element reconstruction value corresponding to the layer having the layer number less than or equal to the layer number of the highest layer that is coded, a matrix element reconstruction value corresponding to each layer having a layer number greater than the layer number of the highest layer that is coded.

An apparatus for decoding a matrix for a video signal, the apparatus comprising:

• a determining module, configured to determine a decoding order corresponding to a matrix set and a corresponding sampling method;
• an indicator decoding module, configured to decode a bit stream to obtain an indicator bit for indicating whether a current matrix uses a sampling matrix;
• a first decoding and reconstructing module, configured to use, when the indicator bit indicates that the current matrix uses a sampling matrix, a sampling matrix, which is obtained by performing sampling processing on a decoding reconstruction matrix of a matrix decoded in the decoding order before the current matrix, as a decoding reconstruction matrix of the current matrix;
• a second decoding and reconstructing module, configured to directly decode the bit stream to obtain the decoding reconstruction matrix of the current matrix when the indicator bit indicates that the current matrix uses no sampling matrix;
• and
• a triggering module, configured to trigger the indicator decoding module, the first decoding and reconstructing module, and the second decoding and reconstructing module, thereby decoding the bit stream to obtain all decoding reconstruction matrices of all matrices in the matrix set in the decoding order one by one.