Moving picture coding device, moving picture coding method, moving picture coding program, moving picture decoding device, moving picture decoding method, and moving picture decoding program

• US 10,523,962 B2
• Filed: 02/15/2019
• Issued: 12/31/2019
• Est. Priority Date: 04/12/2012
• Status: Active Grant

• Current Assignee: JVC Kenwood Corporation
• Original Assignee: JVC Kenwood Corporation
• Inventors: Nakamura, Hiroya, Fukushima, Shigeru, Takehara, Hideki
• Primary Examiner(s): Parikh, Dakshesh D
• Application Number:
  US16/276,661
• Publication Number:
  US 20190191176A1
• Time in Patent Office: 319 Days
• Field of Search: None
• CPC Class Codes: H04N 19/105 Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
• CPC Class Codes: H04N 19/139 Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
• CPC Class Codes: H04N 19/159 Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
• CPC Class Codes: H04N 19/172 the region being a picture, frame or field
• CPC Class Codes: H04N 19/174 the region being a slice, e.g. a line of blocks or a group of blocks
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/184 the unit being bits, e.g. of the compressed video stream
• CPC Class Codes: H04N 19/197 including determination of the initial value of an encoding parameter H04N19/56 takes precedence
• CPC Class Codes: H04N 19/463 by compressing encoding parameters before transmission
• CPC Class Codes: H04N 19/513 Processing of motion vectors
• CPC Class Codes: H04N 19/52 by predictive encoding
• CPC Class Codes: H04N 19/573 Motion compensation with multiple frame prediction using two or more reference frames in a given prediction direction
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards

Abstract

A prediction information deriving unit derives the inter-prediction information candidates from inter-prediction information of a prediction block neighboring to a coding target prediction block or a prediction block present at the same position as or near the coding target prediction block in a coded picture at a temporally different position from the coding target prediction block. A candidate supplementing unit supplements inter-prediction information candidates having the same prediction mode, reference index, and motion vector until the number of inter-prediction information candidates reaches the designated number of candidates when the number of inter-prediction information candidates is smaller than the designated number of candidates.

Claims

1. A moving picture decoding device that decodes a bitstream obtained by coding moving pictures using inter-prediction based on inter-prediction information of a merge candidate in units of blocks obtained by partitioning each picture of the moving pictures, the moving picture decoding device comprising:

a prediction information deriving unit that derives merge candidates from inter-prediction information of a prediction block neighboring to a decoding target prediction block or a prediction block present at the same position as or near the decoding target prediction block in a decoded picture at a temporally different position from the decoding target prediction block;

a candidate list constructing unit that constructs a merge candidate list from the derived merge candidates;

a first candidate supplementing unit that repeatedly performs a first process for adding to the merge candidate list a merge candidate of which the moving vector has a first value, the inter-prediction mode has a second value and the reference index has a third value;

a second candidate supplementing unit that repeatedly performs a second process for adding to the merge candidate list after the first process a merge candidate of which the motion vector has the first value, the inter-prediction mode has the second value and the reference index has a fourth value until a number of merge candidates included in the merge candidate list reaches a designated number of merge candidates; and

a merge candidate selecting unit that selects one merge candidate from the merge candidates included in the merge candidate list after the second process, wherein;

the first candidate supplementing unit repeatedly performs the first process in case that a number of merge candidates added by the first candidate supplementing unit is less than a certain number;

the first value is a zero motion vector (0,0);

the second value is a predefined value indicating that the inter-prediction mode is L0 prediction when a decoding target image is a P picture, and the inter-prediction mode is bi-prediction when a decoding target image is a B picture;

the third value is a variable that is incremented by one each time the first process occurs; and

the fourth value is 0.

2. A moving picture decoding method that decodes a bitstream obtained by coding moving pictures using inter-prediction based on inter-prediction information of a merge candidate in units of blocks obtained by partitioning each picture of the moving pictures, the moving picture decoding method comprising:

a prediction information deriving step that derives merge candidates from inter-prediction information of a prediction block neighboring to a decoding target prediction block or a prediction block present at the same position as or near the decoding target prediction block in a decoded picture at a temporally different position from the decoding target prediction block;

a candidate list constructing step that constructs a merge candidate list from the derived merge candidates;

a first candidate supplementing step that repeatedly performs a first process for adding to the merge candidate list a merge candidate of which the moving vector has a first value, the inter-prediction mode has a second value and the reference index has a third value;

a second candidate supplementing step that repeatedly performs a second process for adding to the merge candidate list after the first process a merge candidate of which the motion vector has the first value, the inter-prediction mode has the second value and the reference index has a fourth value until a number of merge candidates included in the merge candidate list reaches a designated number of merge candidates; and

a merge candidate selecting step that selects one merge candidate from the merge candidates included in the merge candidate list after the second process, wherein;

the first candidate supplementing step repeatedly performs the first process in case that a number of merge candidates added by the first candidate supplementing step is less than a certain number;

the first value is a zero motion vector (0,0);

the second value is a predefined value indicating that the inter-prediction mode is L0 prediction when a decoding target image is a P picture, and the inter-prediction mode is bi-prediction when a decoding target image is a B picture;

the third value is a variable that is incremented by one each time the first process occurs; and

the fourth value is 0.

3. A non-transitory computer-readable recording medium having embodied thereon a moving picture decoding program that decodes a bitstream obtained by coding moving pictures using inter-prediction based on inter-prediction information of a merge candidate in units of blocks obtained by partitioning each picture of the moving pictures, the moving picture decoding program causing a computer to execute:

a prediction information deriving step that derives merge candidates from inter-prediction information of a prediction block neighboring to a decoding target prediction block or a prediction block present at the same position as or near the decoding target prediction block in a decoded picture at a temporally different position from the decoding target prediction block;

a candidate list constructing step that constructs a merge candidate list from the derived merge candidates;

a first candidate supplementing step that repeatedly performs a first process for adding to the merge candidate list a merge candidate of which the moving vector has a first value, the inter-prediction mode has a second value and the reference index has a third value;

a second candidate supplementing step that repeatedly performs a second process for adding to the merge candidate list after the first process a merge candidate of which the motion vector has the first value, the inter-prediction mode has the second value and the reference index has a fourth value until a number of merge candidates included in the merge candidate list reaches a designated number of merge candidates; and

a merge candidate selecting step that selects one merge candidate from the merge candidates included in the merge candidate list after the second process, wherein;

the first candidate supplementing step repeatedly performs the first process in case that a number of merge candidates added by the first candidate supplementing step is less than a certain number;

the first value is a zero motion vector (0,0);

the second value is a predefined value indicating that the inter-prediction mode is L0 prediction when a decoding target image is a P picture, and the inter-prediction mode is bi-prediction when a decoding target image is a B picture;

the third value is a variable that is incremented by one each time the first process occurs; and

the fourth value is 0.