Image decoding method and image decoding apparatus

• US 9,491,470 B2
• Filed: 05/12/2014
• Issued: 11/08/2016
• 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): Pe, Geepy
• Application Number:
  US14/275,248
• Publication Number:
  US 20140247886A1
• Time in Patent Office: 911 Days
• Field of Search: None
• US Class Current: 1/1
• 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 image decoding method of decoding units that are included in a picture is provided. The image decoding method decodes a first flag which indicates whether a removal time of encoded data from a buffer by a hypothetical decoder is set per unit. The buffer is for storing the encoded data. The image decoding method further decodes a second flag indicating whether an interval between removal times of the units is one of constant nd arbitrary when the removal times are set per unit. The image decoding method removes the encoded data from the buffer at the removal time, and decodes the removed encoded data.

Claims

1. An image decoding method of decoding encoded data per unit from among units that are included in a picture, the image decoding method comprising:

decoding, from a bitstream including the encoded data, a first flag indicating whether a removal time of the encoded data from a buffer by a hypothetical decoder is set per unit, the buffer being for storing the encoded data;

decoding, from the bitstream, a second flag indicating whether an interval between removal times of the units is one of constant and arbitrary when the removal times are set per unit;

removing the encoded data from the buffer at the removal time; and

decoding the removed encoded data,

wherein the bitstream includes a transport stream and a descriptor, and

the second flag is decoded from the descriptor.

2. An image decoding apparatus for decoding encoded data per unit from among units that are included in a picture, the image decoding apparatus comprising:

a first flag decoder configured to decode, from a bitstream including the encoded data, a first flag indicating whether a removal time of the encoded data from a buffer by a hypothetical decoder is set per unit, the buffer being for storing the encoded data;

a second flag decoder configured to decode, from the bitstream, a second flag indicating whether an interval between removal times of the units is one of constant and arbitrary when the removal times are set per unit;

a remover configured to remove the encoded data from the buffer at the removal time; and

a decoder configured to decode the removed encoded data,

wherein the bitstream includes a transport stream and a descriptor, and

the second flag is decoded from the descriptor.

3. An image decoding apparatus for decoding encoded data per unit from among units that are included in a picture, the image decoding apparatus comprising:

control circuitry; and

storage accessible to the control circuitry,

wherein the control circuitry executes;

decoding, from a bitstream including the encoded data, a first flag indicating whether a removal time of the encoded data from a buffer by a hypothetical decoder is set per unit, the buffer being for storing the encoded data;

decoding, from the bitstream, a second flag indicating whether an interval between removal times of the units is one of constant and arbitrary when the removal times are set per unit;

removing the encoded data from the buffer at the removal time; and

decoding the removed encoded data,

the bitstream includes a transport stream and a descriptor, and

the second flag is decoded from the descriptor.