Image encoding apparatus for encoding flags indicating removal time

• US 10,750,187 B2
• Filed: 11/07/2018
• Issued: 08/18/2020
• Est. Priority Date: 04/23/2012
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Sun Patent Trust
• Inventors: Toma, Tadamasa, Nishi, Takahiro, Shibahara, Youji, Sasai, Hisao, Sugio, Toshiyasu, Tanikawa, Kyoko, Matsunobu, Toru, Terada, Kengo
• Primary Examiner(s): Geroleo, Francis
• Application Number:
  US16/183,241
• Publication Number:
  US 20190075300A1
• Time in Patent Office: 650 Days
• CPC Class Codes: G06T 9/00 Image coding bandwidth or redundancy reduction for static pictures H04N1/41; coding or decoding of static colour picture signals H04N1/64; methods or arrangements for coding, decoding, compressing or decompressing digital video signals H04N19/00
• CPC Class Codes: H04N 19/13 Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
• CPC Class Codes: H04N 19/132 Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
• CPC Class Codes: H04N 19/15 by monitoring actual compressed data size at the memory before deciding storage at the transmission buffer
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/423 characterised by memory arrangements H04N19/433 takes precedence
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards

Abstract

An encoding method of encoding units included in a picture is provided. The encoding method generates a first flag indicating whether a removal time of encoded data from a buffer by a hypothetical decoder is set per unit. When the removal time is set per unit, a second flag is generated which indicates whether an interval between removal times of the units is constant. When the second flag indicates that the interval is constant, common-interval information is generated which is distinct from the second flag and indicates a constant time interval between the removal times of the units. A bitstream including the encoded data, the first flag, the second flag, and the common-interval information is generated. The first flag is included in video usability information of the bitstream. The second flag and the common-interval information are included in control information of the bitstream.

Claims

1. An encoding method of encoding units included in a picture, the encoding method comprising:

generating a first flag indicating whether a removal time of encoded data from a buffer by a hypothetical decoder is set per unit, the buffer storing the encoded data;

generating a second flag indicating whether an interval between removal times of the units is constant when the removal time is set per unit;

generating common-interval information when the second flag indicates that the interval is constant, the common-interval information being distinct from the second flag and indicating a constant time interval between the removal times of the units; and

generating a bitstream including the encoded data, the first flag, the second flag, and the common-interval information,

wherein the first flag is included in video usability information of the bitstream, the video usability information being assigned to at least one picture,

the second flag is included in control information of the bitstream, the control information being provided per picture, and

the common-interval information is included in the control information of the bitstream.

2. The encoding method according to claim 1,

wherein the common-interval information is included in the control information when the second flag indicates that the interval is constant.

3. The encoding method according to claim 2,

wherein the common-interval information includes the constant time interval between the removal times of the units and a total number of the units included in one picture.

4. The encoding method according to claim 1,

wherein a third flag, indicating whether second control information is included in the video usability information, is included in the video usability information, the second control information being information for operating per unit.

5. The encoding method according to claim 1,

wherein a third flag, indicating whether second control information is included in the video usability information, is included in a descriptor included in the bitstream, the second control information being information for operating per unit.

6. A non-transitory computer-readable recording medium including a program for causing a computer to execute an encoding method of encoding units included in a picture, the program causing the computer to execute operations comprising:

generating a first flag indicating whether a removal time of encoded data from a buffer by a hypothetical decoder is set per unit, the buffer storing the encoded data;

generating a second flag indicating whether an interval between removal times of the units is constant when the removal time is set per unit;

generating common-interval information when the second flag indicates that the interval is constant, the common-interval information being distinct from the second flag and indicating a constant time interval between the removal times of the units; and

generating a bitstream including the encoded data, the first flag, the second flag, and the common-interval information,

wherein the first flag is included in video usability information of the bitstream, the video usability information being assigned to at least one picture,

the second flag is included in control information of the bitstream, the control information being provided per picture, and

the common-interval information is included in the control information of the bitstream.

7. An encoding apparatus of encoding units included in a picture, the encoding apparatus comprising:

at least one processor; and

a storage coupled to the at least one processor,

wherein the at least one processor is configured to;

generate a first flag indicating whether a removal time of encoded data from a buffer by a hypothetical decoder is set per unit, the buffer storing the encoded data;

generate a second flag indicating whether an interval between removal times of the units is constant when the removal time is set per unit;

generate common-interval information when the second flag indicates that the interval is constant, the common-interval information being distinct from the second flag and indicating a constant time interval between the removal times of the units; and

generate a bitstream including the encoded data, the first flag, the second flag, and the common-interval information,

the first flag is included in video usability information of the bitstream, the video usability information being assigned to at least one picture,

the second flag is included in control information of the bitstream, the control information being provided per picture, and

the common-interval information is included in the control information of the bitstream.