METHOD FOR DECODING VIDEO BITSTREAM Russian patent published in 2024 - IPC H04N19/44 H04N19/433 

FIELD: physics.

SUBSTANCE: invention relates to a method for decoding a video bitstream. Method comprises obtaining a set of image synchronization parameters, including a coded image buffer deletion delay parameter for removing an access unit from the coded image buffer at the access unit level, wherein each access unit comprises a plurality of decoding units; obtaining data representing an encoded video image; storing data in a buffer of encoded images; obtaining a first flag indicating whether it is necessary to remove the access unit from the encoded picture buffer for decoding at the access unit level or whether it is necessary to remove the decoding unit from the encoded picture buffer for decoding at the fragment level, wherein the decoding unit is a subset of the access unit; determining, based on the first flag, that the access unit or the decoding unit is subject to removal from the encoded image buffer; and in response to the determination that the decoding unit is to be removed from the encoded picture buffer for decoding at the image fragment level, (i) obtaining a second flag indicating whether the bitstream contains a video parameter representing a total deletion delay for all decoding units in the access unit, wherein the total deletion delay is the delay between the current decoding unit and the immediately preceding decoding unit; (ii) in response to determining that the flag indicates that a parameter representing the total deletion delay for all decoding units is contained in the bit stream, obtaining a parameter representing the total deletion delay; (iii) in response to determining that the flag indicates that a parameter representing a total deletion delay for all decoding units is not contained in the bitstream, obtaining separate removal delay parameters for decoding units, each of which represents a delay between successive decoding units in an access unit, wherein at least two separate removal delay parameters for decoding units are different, (iv) removing the decoding unit from the encoded picture buffer based on either a parameter representing a total deletion delay or individual deletion delay parameters for the decoding units; (v) decoding units of decoding; (vi) extracting an image based on the decoded decoding units; and in response to the determination that the access unit is to be removed from the encoded picture buffer for decoding at the access unit level, (i) determining the removal delay for the access unit for the access unit in the data, (ii) removal of the access unit from the coded picture buffer based on the removal delay for the access unit, and (iii) entropy decoding of the remote access unit to generate a plurality of quantised transformed coefficients.

EFFECT: technical result consists in improvement of efficiency of video bit stream decoding.

1 cl, 79 dwg, 50 tbl