Granted Patent B2

US 12,701,268 · App. 18/929,079 · Granted Aug 4, 2026

Inventors: Yue Yu (Palo Alto, CA); Haoping Yu (Palo Alto, CA)

Assignee: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.

H04N19/70H04N19/167H04N19/172H04N19/174

Abstract

Claims (55)

1 . A method for decoding a video comprising a sequence of pictures, each picture comprising one or more slices, the method comprising:

parsing, by a processor, a bitstream to obtain a value of a first flag;

determining, by the processor, whether the value of the first flag indicates that a set of header extension parameters is present;

in response to the value of the first flag indicating that the set of header extension parameters is present, parsing, by the processor, the bitstream to obtain a value of a second flag;

determining, by the processor, whether the value of the second flag for the sequence of pictures indicates that a first parameter is enabled;

in response to the value of the second flag for the sequence of pictures indicating that the first parameter is enabled, parsing, by the processor, the bitstream to obtain a value of the first parameter for one of the slices in the sequence of pictures; and

decoding, by the processor, the slice based on the value of the first parameter for the slice,

wherein the value of the first parameter is encoded in a header of the slice;

wherein the first parameter comprises a last significant coefficient reverse flag indicative of a reference position for referencing a position of the last significant coefficient, and the method further comprises:

in response to the value of the first flag indicating that the set of header extension parameters is present, parsing, by the processor, the bitstream to obtain a value of a third flag;

determining, by the processor, whether the value of the third flag for the sequence of pictures indicates that a second parameter is enabled:

in response to the value of the third flag for the sequence of pictures indicating that the second parameter is enabled, parsing, by the processor, the bitstream to obtain a value of the second parameter for the slice; and

decoding, by the processor, the slice based on the values of the first parameter and the second parameter for the slice.

2 . A system for decoding a video comprising a sequence of pictures, each picture comprising one or more slices, the system comprising:

a memory configured to store instructions; and

a processor coupled to the memory and configured to, upon executing the instructions:

parse a bitstream to obtain a value of a first flag;

determine whether the value of the first flag indicates that a set of header extension parameters is present;

in response to the value of the first flag indicating that the set of header extension parameters is present, parse the bitstream to obtain a value of a second flag;

determine whether the value of the second flag for the sequence of pictures indicates that a first parameter is enabled;

in response to the value of the second flag for the sequence of pictures indicating that the first parameter is enabled, parse the bitstream to obtain a value of the first parameter for one of the slices in the sequence of pictures; and

decode the slice based on the value of the first parameter for the slice,

wherein the value of the first parameter is encoded in a header of the slice;

wherein the first parameter comprises a last significant coefficient reverse flag indicative of a reference position for referencing a position of the last significant coefficient, and the processor is further configured to:

in response to the value of the first flag indicating that the set of header extension parameters is present, parse the bitstream to obtain a value of a third flag;

determine whether the value of the third flag for the sequence of pictures indicates that a second parameter is enabled;

in response to the value of the third flag for the sequence of pictures indicating that the second parameter is enabled, parse the bitstream to obtain a value of the second parameter for the slice; and

decode the slice based on the values of the first parameter and the second parameter for the slice.

3 . A method for encoding a video comprising a sequence of pictures, each picture comprising one or more slices, the method comprising:

determining, by a processor, a value of a first parameter for at least one of the slices in the sequence of pictures;

determining, by the processor, a value of a first flag indicative of whether the set of header extension parameters is present based on the value of the first parameter;

determining, by the processor, a value of a second flag for the sequence of pictures indicative of whether the first parameter is enabled based on the value of the first parameter;

encoding, by the processor, the at least one slice based on the value of the first parameter into a bitstream; and

encoding, by the processor, the values of the first flag, the second flag, and the first parameter into the bitstream,

wherein the value of the first parameter is encoded in a header of the at least slice;

wherein the first parameter comprises a last significant coefficient reverse flag indicative of a reference position for referencing a position of the last significant coefficient, and the method further comprises:

determining, by the processor, a value of a second parameter for the at least one slice;

determining, by the processor, a value of a third flag for the sequence of pictures indicative of whether the second parameter is enabled based on the value of the second parameter

encoding, by the processor, the at least one slice based on the values of the first parameter and the second parameter into the bitstream; and

encoding, by the processor, the values of the first flag, the second flag, the first parameter, and the second parameter into the bitstream.

4 . A system for encoding a video comprising a sequence of pictures, each picture comprising one or more slice, the system comprising:

a memory configured to store instructions; and

a processor coupled to the memory and configured to, upon executing the instructions:

determine a value of a first parameter for at least one of the slices in the sequence of pictures;

determine a value of a first flag indicative of whether the set of header extension parameters is present based on the value of the first parameter;

determine a value of a second flag for the sequence of pictures indicative of whether the first parameter is enabled based on the value of the first parameter;

encode the at least one slice based on the value of the first parameter into a bitstream; and

encode the values of the first flag, the second flag, and the first parameter into the bitstream,

wherein the value of the first parameter is encoded in a header of the at least slice;

wherein the first parameter comprises a last significant coefficient reverse flag indicative of a reference position for referencing a position of the last significant coefficient, and the processor is further configured to:

determine a value of a second parameter for the at least one slice;

determine a value of a third flag for the sequence of pictures indicative of whether the second parameter is enabled based on the value of the second parameter;

encode the at least one slice based on the values of the first parameter and the second parameter into the bitstream; and

encode the values of the first flag, the second flag, the first parameter, and the second parameter into the bitstream.

5 . A non-transitory computer-readable storage medium, having a computer program and a bitstream stored thereon, wherein the computer program, when executed by a processor, enables the processor to perform the steps of the method of claim 3 to generate the bitstream.

Assignments (2)

Continuity (4)

References Cited (81)