JP2013141297A5

JP2013141297A5 -

Info

Publication number: JP2013141297A5
Application number: JP2013043849A
Authority: JP
Filing date: 2013-03-06
Publication date: 2014-06-19
Anticipated expiration: 2031-06-30

Description

動画像の各ピクチャを分割したブロック単位で動きベクトルを用いて符号化された符号列を復号する画像復号装置であって、前記符号列から復号対象ブロックごとに、画像間予測モードを示す予測モード情報と第１のインデックス、または、画像間予測モードを示す予測モード情報と第２のインデックスと差分動きベクトルとを復号する符号列復号部と、前記復号対象ブロックの複数の参照ブロックの符号化情報を取得する取得部と、前記符号列復号部により復号された予測モード情報の示す画像間予測モードが、インデックスによって特定される参照ブロックの前記符号化情報が備える動きベクトルの情報を用いる第１の画像間予測モードである場合に、第１の所定順位に基づいて前記複数の参照ブロックから符号化情報を導出して第１の候補リストを生成し、前記符号列復号部により復号された第１のインデックスをもとに、前記第１の候補リストから第１の候補を特定し、当該第１の候補の符号化情報を出力する第１のモード出力部と、前記符号列復号部により復号された予測モード情報の示す画像間予測モードが、インデックスによって特定される参照ブロックに対応した差分動きベクトルを用いる第２の画像間予測モードである場合に、第２の所定順位に基づいて前記複数の参照ブロックから予測動きベクトルを導出して第２の候補リストを生成し、前記符号列復号部により復号された第２のインデックスをもとに、前記第２の候補リストから第２の候補を特定し、当該第２の候補の予測動きベクトルと前記符号列復号部により復号された差分動きベクトルから前記復号対象ブロックの動きベクトルを算出して出力する第２のモード出力部と、前記第１のモード出力部または前記第２のモード出力部から出力された情報をもとに、前記符号列復号部により復号された予測モード情報の示す画像間予測モードを用いて動き補償を行い予測画像を生成する動き補償予測部と、を備え、前記第１のモード出力部及び前記第２のモード出力部は、前記複数の参照ブロックとして、共通の複数のブロックを使用し、前記第１のモード出力部が前記第１の候補リストを生成する為の前記第１の所定順位と、前記第２のモード出力部が前記第２の候補リストを生成する為の前記第２の所定順位とが異なり、前記複数の参照ブロックには、前記復号対象ブロックに空間的に隣接する既に復号されたブロックと、前記復号対象ブロックを含むピクチャと時間的に異なるピクチャに含まれるブロックを含み、前記第２のモード出力部は、前記複数の参照ブロックから予測動きベクトルを導出する際に、前記時間的に異なるピクチャに含まれるブロックの前記第２の所定順位における順位を、前記空間的に隣接するブロックの前記第２の所定順位における順位よりも低く設定し、前記空間的に隣接する既に符号化された複数のブロックのうち、前記符号化対象ブロックの左側に配置されたブロックを左ブロック群、前記符号化対象ブロックの上側に配置されたブロックを上ブロック群とし、前記ブロック群の中からそれぞれの前記ブロック群を代表する候補を導出し、前記左ブロック群の候補、前記上ブロック群の候補の順番に前記第２の所定順位を設けて、前記第２の候補リストを生成することを特徴とする画像復号装置を提供する。
動画像の各ピクチャを分割したブロック単位で動きベクトルを用いて符号化された符号列を復号する画像復号方法であって、前記符号列から復号対象ブロックごとに、画像間予測モードを示す予測モード情報と第１のインデックス、または、画像間予測モードを示す予測モード情報と第２のインデックスと差分動きベクトルとを復号する第１ステップと、前記復号対象ブロックの複数の参照ブロックの符号化情報を取得する第２ステップと、前記第１ステップにより復号された予測モード情報の示す画像間予測モードが、インデックスによって特定される参照ブロックの前記符号化情報が備える動きベクトルの情報を用いる第１の画像間予測モードである場合に、第１の所定順位に基づいて前記複数の参照ブロックから符号化情報を導出して第１の候補リストを生成し、前記第１ステップにより復号された第１のインデックスをもとに、前記第１の候補リストから第１の候補を特定し、当該第１の候補の符号化情報を出力する第３ステップと、前記第１ステップにより復号された予測モード情報の示す画像間予測モードが、インデックスによって特定される参照ブロックに対応した差分動きベクトルを用いる第２の画像間予測モードである場合に、第２の所定順位に基づいて前記複数の参照ブロックから予測動きベクトルを導出して第２の候補リストを生成し、前記第１ステップにより復号された第２のインデックスをもとに、前記第２の候補リストから第２の候補を特定し、当該第２の候補の予測動きベクトルと前記第１ステップにより復号された差分動きベクトルから前記復号対象ブロックの動きベクトルを算出して出力する第４ステップと、前記第３ステップまたは前記第４ステップにより出力された情報をもとに、前記第１ステップにより復号された予測モード情報の示す画像間予測モードを用いて動き補償を行い予測画像を生成する第５ステップと、を備え、前記第３ステップ及び前記第４ステップは、前記複数の参照ブロック候補として、共通の複数のブロックを使用し、前記第３ステップにおいて前記第１の候補リストを生成する為の前記第１の所定順位と、前記第４ステップにおいて前記第２の候補リストを生成する為の前記第２の所定順位とが異なり、前記複数の参照ブロックには、前記復号対象ブロックに空間的に隣接する既に復号されたブロックと、前記復号対象ブロックを含むピクチャと時間的に異なるピクチャに含まれるブロックを含み、前記第４ステップにおいて、前記複数の参照ブロックから予測動きベクトルを導出する際に、前記時間的に異なるピクチャに含まれるブロックの前記第２の所定順位における順位を、前記空間的に隣接するブロックの前記第２の所定順位における順位よりも低く設定し、前記空間的に隣接する既に符号化された複数のブロックのうち、前記符号化対象ブロックの左側に配置されたブロックを左ブロック群、前記符号化対象ブロックの上側に配置されたブロックを上ブロック群とし、前記ブロック群の中からそれぞれの前記ブロック群を代表する候補を導出し、前記左ブロック群の候補、前記上ブロック群の候補の順番に前記第２の所定順位を設けて、前記第２の候補リストを生成することを特徴とする画像復号方法を提供する。
動画像の各ピクチャを分割したブロック単位で動きベクトルを用いて符号化された符号列を復号する画像復号プログラムであって、前記符号列から復号対象ブロックごとに、画像間予測モードを示す予測モード情報と第１のインデックス、または、画像間予測モードを示す予測モード情報と第２のインデックスと差分動きベクトルとを復号する第１ステップと、前記復号対象ブロックの複数の参照ブロックの符号化情報を取得する第２ステップと、前記第１ステップにより復号された予測モード情報の示す画像間予測モードが、インデックスによって特定される参照ブロックの前記符号化情報が備える動きベクトルの情報を用いる第１の画像間予測モードである場合に、第１の所定順位に基づいて前記複数の参照ブロックから符号化情報を導出して第１の候補リストを生成し、前記第１ステップにより復号された第１のインデックスをもとに、前記第１の候補リストから第１の候補を特定し、当該第１の候補の符号化情報を出力する第３ステップと、前記第１ステップにより復号された予測モード情報の示す画像間予測モードが、インデックスによって特定される参照ブロックに対応した差分動きベクトルを用いる第２の画像間予測モードである場合に、第２の所定順位に基づいて前記複数の参照ブロックから予測動きベクトルを導出して第２の候補リストを生成し、前記第１ステップにより復号された第２のインデックスをもとに、前記第２の候補リストから第２の候補を特定し、当該第２の候補の予測動きベクトルと前記第１ステップにより復号された差分動きベクトルから前記復号対象ブロックの動きベクトルを算出して出力する第４ステップと、前記第３ステップまたは前記第４ステップにより出力された情報をもとに、前記第１ステップにより復号された予測モード情報の示す画像間予測モードを用いて動き補償を行い予測画像を生成する第５ステップと、をコンピュータに実行させ、前記第３ステップ及び前記第４ステップは、前記複数の参照ブロック候補として、共通の複数のブロックを使用し、前記第３ステップにおいて前記第１の候補リストを生成する為の前記第１の所定順位と、前記第４ステップにおいて前記第２の候補リストを生成する為の前記第２の所定順位とが異なり、前記複数の参照ブロックには、前記復号対象ブロックに空間的に隣接する既に復号されたブロックと、前記復号対象ブロックを含むピクチャと時間的に異なるピクチャに含まれるブロックを含み、前記第４ステップにおいて、前記複数の参照ブロックから予測動きベクトルを導出する際に、前記時間的に異なるピクチャに含まれるブロックの前記第２の所定順位における順位を、前記空間的に隣接するブロックの前記第２の所定順位における順位よりも低く設定し、前記空間的に隣接する既に符号化された複数のブロックのうち、前記符号化対象ブロックの左側に配置されたブロックを左ブロック群、前記符号化対象ブロックの上側に配置されたブロックを上ブロック群とし、前記ブロック群の中からそれぞれの前記ブロック群を代表する候補を導出し、前記左ブロック群の候補、前記上ブロック群の候補の順番に前記第２の所定順位を設けて、前記第２の候補リストを生成することを特徴とする画像復号プログラムを提供する。
動画像が符号化された符号列を受信して復号する受信装置であって、動画像の各ピクチャを分割したブロック単位で動きベクトルを用いて符号化された符号列がパケット化された符号化ストリームを受信する受信部と、受信された前記パケット化された符号化ストリームをパケット処理して元の符号列を復元する復元部と、復元された前記元の符号列から復号対象ブロックごとに、画像間予測モードを示す予測モード情報と第１のインデックス、または、画像間予測モードを示す予測モード情報と第２のインデックスと差分動きベクトルとを復号する符号列復号部と、前記復号対象ブロックの複数の参照ブロックの符号化情報を取得する取得部と前記符号列復号部により復号された予測モード情報の示す画像間予測モードが、インデックスによって特定される参照ブロックの前記符号化情報が備える動きベクトルの情報を用いる第１の画像間予測モードである場合に、第１の所定順位に基づいて前記複数の参照ブロックから符号化情報を導出して第１の候補リストを生成し、前記符号列復号部により復号された第１のインデックスをもとに、前記第１の候補リストから第１の候補を特定し、当該第１の候補の符号化情報を出力する第１のモード出力部と、前記符号列復号部により復号された予測モード情報の示す画像間予測モードが、インデックスによって特定される参照ブロックに対応した差分動きベクトルを用いる第２の画像間予測モードである場合に、第２の所定順位に基づいて前記複数の参照ブロックから予測動きベクトルを導出して第２の候補リストを生成し、前記符号列復号部により復号された第２のインデックスをもとに、前記第２の候補リストから第２の候補を特定し、当該第２の候補の予測動きベクトルと前記符号列復号部により復号された差分動きベクトルから前記復号対象ブロックの動きベクトルを算出して出力する第２のモード出力部と、前記第１のモード出力部または前記第２のモード出力部から出力された情報をもとに、前記符号列復号部により復号された予測モード情報の示す画像間予測モードを用いて動き補償を行い予測画像を生成する動き補償予測部と、を備え、前記第１のモード出力部及び前記第２のモード出力部は、前記複数の参照ブロックとして、共通の複数のブロックを使用し、前記第１のモード出力部が前記第１の候補リストを生成する為の前記第１の所定順位と、前記第２のモード出力部が前記第２の候補リストを生成する為の前記第２の所定順位とが異なり、前記複数の参照ブロックには、前記復号対象ブロックに空間的に隣接する既に復号されたブロックと、前記復号対象ブロックを含むピクチャと時間的に異なるピクチャに含まれるブロックを含み、前記第２のモード出力部は、前記複数の参照ブロックから予測動きベクトルを導出する際に、前記時間的に異なるピクチャに含まれるブロックの前記第２の所定順位における順位を、前記空間的に隣接するブロックの前記第２の所定順位における順位よりも低く設定し、前記空間的に隣接する既に符号化された複数のブロックのうち、前記符号化対象ブロックの左側に配置されたブロックを左ブロック群、前記符号化対象ブロックの上側に配置されたブロックを上ブロック群とし、前記ブロック群の中からそれぞれの前記ブロック群を代表する候補を導出し、前記左ブロック群の候補、前記上ブロック群の候補の順番に前記第２の所定順位を設けて、前記第２の候補リストを生成することを特徴とする受信装置を提供する。
動画像が符号化された符号列を受信して復号する受信方法であって、動画像の各ピクチャを分割したブロック単位で動きベクトルを用いて符号化された符号列がパケット化された符号化ストリームを受信する受信ステップと、受信された前記パケット化された符号化ストリームをパケット処理して元の符号列を復元する復元ステップと、復元された前記元の符号列から復号対象ブロックごとに、画像間予測モードを示す予測モード情報と第１のインデックス、または、画像間予測モードを示す予測モード情報と第２のインデックスと差分動きベクトルとを復号する第１ステップと、前記復号対象ブロックの複数の参照ブロックの符号化情報を取得する第２ステップと、前記第１ステップにより復号された予測モード情報の示す画像間予測モードが、インデックスによって特定される参照ブロックの前記符号化情報が備える動きベクトルの情報を用いる第１の画像間予測モードである場合に、第１の所定順位に基づいて前記複数の参照ブロックから符号化情報を導出して第１の候補リストを生成し、前記第１ステップにより復号された第１のインデックスをもとに、前記第１の候補リストから第１の候補を特定し、当該第１の候補の符号化情報を出力する第３ステップと、前記第１ステップにより復号された予測モード情報の示す画像間予測モードが、インデックスによって特定される参照ブロックに対応した差分動きベクトルを用いる第２の画像間予測モードである場合に、第２の所定順位に基づいて前記複数の参照ブロックから予測動きベクトルを導出して第２の候補リストを生成し、前記第１ステップにより復号された第２のインデックスをもとに、前記第２の候補リストから第２の候補を特定し、当該第２の候補の予測動きベクトルと前記第１ステップにより復号された差分動きベクトルから前記復号対象ブロックの動きベクトルを算出して出力する第４ステップと、前記第３ステップまたは前記第４ステップにより出力された情報をもとに、前記第１ステップにより復号された予測モード情報の示す画像間予測モードを用いて動き補償を行い予測画像を生成する第５ステップと、を備え、前記第３ステップ及び前記第４ステップは、前記複数の参照ブロック候補として、共通の複数のブロックを使用し、前記第３ステップにおいて前記第１の候補リストを生成する為の前記第１の所定順位と、前記第４ステップにおいて前記第２の候補リストを生成する為の前記第２の所定順位とが異なり、前記複数の参照ブロックには、前記復号対象ブロックに空間的に隣接する既に復号されたブロックと、前記復号対象ブロックを含むピクチャと時間的に異なるピクチャに含まれるブロックを含み、前記第４ステップにおいて、前記複数の参照ブロックから予測動きベクトルを導出する際に、前記時間的に異なるピクチャに含まれるブロックの前記第２の所定順位における順位を、前記空間的に隣接するブロックの前記第２の所定順位における順位よりも低く設定し、前記空間的に隣接する既に符号化された複数のブロックのうち、前記符号化対象ブロックの左側に配置されたブロックを左ブロック群、前記符号化対象ブロックの上側に配置されたブロックを上ブロック群とし、前記ブロック群の中からそれぞれの前記ブロック群を代表する候補を導出し、前記左ブロック群の候補、前記上ブロック群の候補の順番に前記第２の所定順位を設けて、前記第２の候補リストを生成することを特徴とする受信方法を提供する。
動画像が符号化された符号列を受信して復号する受信プログラムであって、動画像の各ピクチャを分割したブロック単位で動きベクトルを用いて符号化された符号列がパケット化された符号化ストリームを受信する受信ステップと、受信された前記パケット化された符号化ストリームをパケット処理して元の符号列を復元する復元ステップと、復元された前記元の符号列から復号対象ブロックごとに、画像間予測モードを示す予測モード情報と第１のインデックス、または、画像間予測モードを示す予測モード情報と第２のインデックスと差分動きベクトルとを復号する第１ステップと、前記復号対象ブロックの複数の参照ブロックの符号化情報を取得する第２ステップと、前記第１ステップにより復号された予測モード情報の示す画像間予測モードが、インデックスによって特定される参照ブロックの前記符号化情報が備える動きベクトルの情報を用いる第１の画像間予測モードである場合に、第１の所定順位に基づいて前記複数の参照ブロックから符号化情報を導出して第１の候補リストを生成し、前記第１ステップにより復号された第１のインデックスをもとに、前記第１の候補リストから第１の候補を特定し、当該第１の候補の符号化情報を出力する第３ステップと、前記第１ステップにより復号された予測モード情報の示す画像間予測モードが、インデックスによって特定される参照ブロックに対応した差分動きベクトルを用いる第２の画像間予測モードである場合に、第２の所定順位に基づいて前記複数の参照ブロックから予測動きベクトルを導出して第２の候補リストを生成し、前記第１ステップにより復号された第２のインデックスをもとに、前記第２の候補リストから第２の候補を特定し、当該第２の候補の予測動きベクトルと前記第１ステップにより復号された差分動きベクトルから前記復号対象ブロックの動きベクトルを算出して出力する第４ステップと、前記第３ステップまたは前記第４ステップにより出力された情報をもとに、前記第１ステップにより復号された予測モード情報の示す画像間予測モードを用いて動き補償を行い予測画像を生成する第５ステップと、をコンピュータに実行させ、前記第３ステップ及び前記第４ステップは、前記複数の参照ブロック候補として、共通の複数のブロックを使用し、前記第３ステップにおいて前記第１の候補リストを生成する為の前記第１の所定順位と、前記第４ステップにおいて前記第２の候補リストを生成する為の前記第２の所定順位とが異なり、前記複数の参照ブロックには、前記復号対象ブロックに空間的に隣接する既に復号されたブロックと、前記復号対象ブロックを含むピクチャと時間的に異なるピクチャに含まれるブロックを含み、前記第４ステップにおいて、前記複数の参照ブロックから予測動きベクトルを導出する際に、前記時間的に異なるピクチャに含まれるブロックの前記第２の所定順位における順位を、前記空間的に隣接するブロックの前記第２の所定順位における順位よりも低く設定し、前記空間的に隣接する既に符号化された複数のブロックのうち、前記符号化対象ブロックの左側に配置されたブロックを左ブロック群、前記符号化対象ブロックの上側に配置されたブロックを上ブロック群とし、前記ブロック群の中からそれぞれの前記ブロック群を代表する候補を導出し、前記左ブロック群の候補、前記上ブロック群の候補の順番に前記第２の所定順位を設けて、前記第２の候補リストを生成することを特徴とする受信プログラムを提供する。
なお、以上の構成要素の任意の組み合わせ、本発明の表現を方法、装置、システム、記録媒体、コンピュータプログラムなどの間で変換したものもまた、本発明の態様として有効である。
An image decoding apparatus for decoding a code string encoded using a motion vector in units of blocks obtained by dividing each picture of a moving image, wherein a prediction mode indicating an inter-picture prediction mode for each decoding target block from the code string A code sequence decoding unit that decodes the information and the first index, or prediction mode information indicating the inter-picture prediction mode, the second index, and the difference motion vector; and encoding information of a plurality of reference blocks of the decoding target block And an inter-picture prediction mode indicated by the prediction mode information decoded by the code string decoding unit uses information on a motion vector included in the coding information of a reference block specified by an index. when a prediction mode between the images, the first derive the encoded information from said plurality of reference blocks based on the first specified rank order Generate a complementary list, identify the first candidate from the first candidate list based on the first index decoded by the code string decoding unit, and output the encoded information of the first candidate The inter-picture prediction mode indicated by the prediction mode information decoded by the first sequence output unit and the code string decoding unit uses a differential motion vector corresponding to the reference block specified by the index. When the mode is a mode, a prediction motion vector is derived from the plurality of reference blocks based on a second predetermined order to generate a second candidate list, and the second index decoded by the code string decoding unit is Based on the second candidate list, the second candidate is identified, and the second candidate motion vector is decoded from the second candidate predicted motion vector and the difference motion vector decoded by the code string decoding unit. Based on the information output from the second mode output unit that calculates and outputs the motion vector of the elephant block, and the information output from the first mode output unit or the second mode output unit, the code string decoding unit A motion compensation prediction unit that generates a predicted image by performing motion compensation using the inter-picture prediction mode indicated by the decoded prediction mode information, and the first mode output unit and the second mode output unit include: A plurality of common blocks are used as the plurality of reference blocks, and the first predetermined order for the first mode output unit to generate the first candidate list and the second mode output unit Is different from the second predetermined order for generating the second candidate list, and the plurality of reference blocks include an already decoded block spatially adjacent to the decoding target block, and the decoding target Bro It includes a block included in a picture and temporally different picture including a click, the previous SL second mode output unit, in deriving the predicted motion vector from said plurality of reference blocks, the temporally included in different picture is a rank in the second specified rank order of blocks, the spatially lower than rank in the second specified rank order in the adjacent blocks, the plurality of blocks that have already been encoded adjacent to said spatial Among them, the block arranged on the left side of the block to be encoded is a left block group, the block arranged above the block to be encoded is an upper block group, and each block group is represented from the block group. Candidates for the left block group and the candidates for the upper block group are provided in the order of the second predetermined rank, and the second candidate list is derived. To provide an image decoding apparatus and generates and.
An image decoding method for decoding a code string encoded using a motion vector in units of blocks obtained by dividing each picture of a moving image, wherein a prediction mode indicating an inter-picture prediction mode for each decoding target block from the code string A first step of decoding information and a first index or prediction mode information indicating an inter-picture prediction mode, a second index, and a difference motion vector; and encoding information of a plurality of reference blocks of the decoding target block A second image to be acquired, and a first image using motion vector information included in the coding information of the reference block specified by the index, as the inter-picture prediction mode indicated by the prediction mode information decoded in the first step If it is between the prediction mode, and deriving coded information from said plurality of reference blocks based on the first specified rank order 1 candidate list is generated, based on the first index decoded in the first step, the first candidate is identified from the first candidate list, and the encoding information of the first candidate is The third step to output and the inter-picture prediction mode indicated by the prediction mode information decoded in the first step are the second inter-picture prediction mode using the differential motion vector corresponding to the reference block specified by the index. A second candidate list is generated by deriving a motion vector predictor from the plurality of reference blocks based on a second predetermined order, and based on the second index decoded in the first step, The second candidate is identified from the second candidate list, and the decoding is performed based on the predicted motion vector of the second candidate and the difference motion vector decoded in the first step. The fourth step of calculating and outputting the motion vector of the elephant block, and between the images indicated by the prediction mode information decoded in the first step based on the information output in the third step or the fourth step A fifth step of generating a predicted image by performing motion compensation using a prediction mode, wherein the third step and the fourth step use a plurality of common blocks as the plurality of reference block candidates, The first predetermined order for generating the first candidate list in the third step is different from the second predetermined order for generating the second candidate list in the fourth step, The plurality of reference blocks include temporally adjacent blocks that are spatially adjacent to the block to be decoded, and a picture that includes the block to be decoded. Includes a block included in a different picture, Oite the fourth steps, in deriving the predicted motion vector from said plurality of reference blocks, the second specified rank order of blocks included in different picture to the temporally a rank in the set lower than rank in the second specified rank order of spatially adjacent blocks, among the plurality of blocks that have already been encoded adjacent to said spatial left of the encoding target block The left block group is the block arranged in the left block group, the upper block group is the block arranged above the encoding target block, and candidates representing the respective block group are derived from the block group, and the left block The second candidate list is generated by providing the second predetermined order in the order of group candidates and the upper block group candidates. Providing that image decoding method.
An image decoding program for decoding a code string encoded using a motion vector in units of blocks obtained by dividing each picture of a moving image, wherein a prediction mode indicating an inter-picture prediction mode for each decoding target block from the code string A first step of decoding information and a first index or prediction mode information indicating an inter-picture prediction mode, a second index, and a difference motion vector; and encoding information of a plurality of reference blocks of the decoding target block A second image to be acquired, and a first image using motion vector information included in the coding information of the reference block specified by the index, as the inter-picture prediction mode indicated by the prediction mode information decoded in the first step If it is between the prediction mode, electrically encoded information from said plurality of reference blocks based on the first specified rank order And generating a first candidate list, based on the first index decoded by the first step, identifying the first candidate from the first candidate list, the sign of the first candidate A second step of outputting interpolated information, and a second inter-picture prediction in which the inter-picture prediction mode indicated by the prediction mode information decoded in the first step uses a differential motion vector corresponding to the reference block specified by the index In the case of the mode, a motion vector predictor is derived from the plurality of reference blocks based on a second predetermined order to generate a second candidate list, and the second index decoded in the first step is also included. In addition, the second candidate is identified from the second candidate list, and the previous candidate motion vector and the difference motion vector decoded in the first step An image indicated by the prediction mode information decoded in the first step based on the fourth step of calculating and outputting the motion vector of the block to be decoded and the information output in the third step or the fourth step. A fifth step of generating a predicted image by performing motion compensation using the inter prediction mode, wherein the third step and the fourth step are a plurality of common blocks as the plurality of reference block candidates. The first predetermined order for generating the first candidate list in the third step, and the second predetermined order for generating the second candidate list in the fourth step. The plurality of reference blocks include an already decoded block spatially adjacent to the decoding target block, and the decoding target block Includes a block included in a picture and temporally different picture containing, Oite to the fourth steps, in deriving the predicted motion vector from said plurality of reference blocks, blocks included in different picture to the temporally of a rank of the second specified rank order, the spatially lower than rank in the second specified rank order in the adjacent blocks, one of the spatially adjacent already coded plurality of blocks, The block arranged on the left side of the encoding target block is a left block group, the block arranged above the encoding target block is an upper block group, and candidates representing each block group from the block group And the second predetermined list is provided in the order of the left block group candidate and the upper block group candidate. To provide an image decoding program and generates a.
A receiving device that receives and decodes a code sequence in which a moving image is encoded, and is an encoding in which a code sequence encoded using a motion vector in units of blocks obtained by dividing each picture of a moving image is packetized A receiving unit that receives a stream, a restoration unit that performs packet processing on the received packetized encoded stream to restore an original code string, and a decoding target block from the restored original code string, A prediction mode information indicating the inter-picture prediction mode and the first index, or a prediction sequence information indicating the inter-picture prediction mode, a second index, and a differential motion vector; An acquisition unit that acquires encoding information of a plurality of reference blocks, and an inter-picture prediction mode indicated by prediction mode information decoded by the code string decoding unit is included in the index Accordingly, in the first inter-picture prediction mode using the motion vector information included in the coding information of the identified reference block, the coding information is derived from the plurality of reference blocks based on a first predetermined order. And generating a first candidate list, identifying the first candidate from the first candidate list based on the first index decoded by the code string decoding unit, and The first mode output unit that outputs the encoded information and the inter-picture prediction mode indicated by the prediction mode information decoded by the code string decoding unit use the difference motion vector corresponding to the reference block specified by the index. when a prediction mode between two images to generate a second candidate list to derive a predicted motion vector from said plurality of reference blocks based on the second predetermined order, the code Based on the second index decoded by the decoding unit, the second candidate is identified from the second candidate list, and the predicted motion vector of the second candidate and the difference decoded by the code string decoding unit Based on the information output from the second mode output unit that calculates and outputs the motion vector of the decoding target block from the motion vector, and the information output from the first mode output unit or the second mode output unit, A motion compensated prediction unit that generates a predicted image by performing motion compensation using the inter-picture prediction mode indicated by the prediction mode information decoded by the code string decoding unit, the first mode output unit and the second mode output unit mode output unit, as the plurality of reference blocks, by using a common plurality of blocks, and the first specified rank order for the first mode output unit to generate the first candidate list, the first Unlike a predetermined order said second mode output unit of for generating the second candidate list of, wherein the plurality of reference blocks, and the block already decoded spatially adjacent to the current block includes a block included in a picture and temporally different picture including the current block, the previous SL second mode output unit, in deriving the predicted motion vector from said plurality of reference blocks, the temporally the rank of the second specified rank order of blocks included in different pictures, the spatially lower than rank in the second specified rank order in the adjacent blocks have already been encoded adjacent to said spatial Among a plurality of blocks, a block arranged on the left side of the encoding target block is a left block group, and a block arranged on the upper side of the encoding target block. And the second predetermined order is provided in the order of the left block group candidate and the upper block group candidate. Then, the receiving apparatus is characterized in that the second candidate list is generated.
A reception method for receiving and decoding a code sequence in which a moving image is encoded, and encoding in which a code sequence encoded using a motion vector in units of blocks obtained by dividing each picture of a moving image is packetized A receiving step for receiving a stream, a restoring step for packetizing the received packetized encoded stream to restore the original code string, and for each decoding target block from the restored original code string, A first step of decoding prediction mode information indicating the inter-picture prediction mode and the first index, or prediction mode information indicating the inter-picture prediction mode, the second index, and the difference motion vector; and a plurality of the decoding target blocks A second step of acquiring the coding information of the reference block of the image, and an inter-picture prediction mode indicated by the prediction mode information decoded by the first step. But in the case of the first inter-picture prediction mode of using the motion vector information the encoding information of the reference block identified by the index is provided, coded from the plurality of reference blocks based on the first specified rank order Deriving information to generate a first candidate list, identifying a first candidate from the first candidate list based on the first index decoded in the first step, A third step of outputting candidate encoding information, and a second step in which an inter-picture prediction mode indicated by the prediction mode information decoded in the first step uses a differential motion vector corresponding to a reference block specified by an index when a prediction mode between images, play the second candidate list to derive a predicted motion vector from said plurality of reference blocks based on the second specified rank order Then, based on the second index decoded in the first step, the second candidate is identified from the second candidate list, and the predicted motion vector of the second candidate and the first step are decoded. The fourth step of calculating and outputting the motion vector of the decoding target block from the difference motion vector thus obtained and the information output by the third step or the fourth step are decoded by the first step. A fifth step of generating a prediction image by performing motion compensation using the inter-picture prediction mode indicated by the prediction mode information, wherein the third step and the fourth step are common as the plurality of reference block candidates. The first predetermined order for generating the first candidate list in the third step, and the fourth step. And the second predetermined order for generating the second candidate list is different from the second predetermined list in that the plurality of reference blocks include an already decoded block spatially adjacent to the decoding target block and the decoding target includes a block included in a picture and temporally different picture including the block, Oite the fourth steps, in deriving the predicted motion vector from said plurality of reference blocks included in different picture to the temporally the rank of the second specified rank order of blocks, the spatially lower than rank in the second specified rank order in the adjacent blocks, among the plurality of blocks that have already been encoded adjacent to said spatial The block arranged on the left side of the encoding target block is the left block group, and the block arranged on the upper side of the encoding target block is the upper block. A candidate representing the block group is derived from the block group, the second predetermined order is provided in the order of the left block group candidate and the upper block group candidate, A reception method is provided that generates two candidate lists.
A reception program that receives and decodes a code sequence in which a moving image is encoded, and is an encoding in which a code sequence encoded using a motion vector in units of blocks obtained by dividing each picture of a moving image is packetized A receiving step for receiving a stream, a restoring step for packetizing the received packetized encoded stream to restore the original code string, and for each decoding target block from the restored original code string, A first step of decoding prediction mode information indicating the inter-picture prediction mode and the first index, or prediction mode information indicating the inter-picture prediction mode, the second index, and the difference motion vector; and a plurality of the decoding target blocks A second step of acquiring the encoding information of the reference block, and an inter-picture prediction indicated by the prediction mode information decoded in the first step. Mode, when a first image prediction mode using motion vector information which the coding information of the reference block identified by the index is provided, numeral from said plurality of reference blocks based on the first specified rank order And generating a first candidate list, identifying a first candidate from the first candidate list based on the first index decoded in the first step, and A third step of outputting the candidate encoding information, and a second mode in which the inter-picture prediction mode indicated by the prediction mode information decoded in the first step uses a differential motion vector corresponding to the reference block specified by the index when an image predictive mode, the second candidate list to derive a predicted motion vector from said plurality of reference blocks based on the second specified rank order The second candidate is identified from the second candidate list based on the second index decoded in the first step, and the predicted motion vector of the second candidate and the first step are identified. The fourth step of calculating and outputting the motion vector of the block to be decoded from the difference motion vector decoded by the step 1, and the first step based on the information output by the third step or the fourth step And a fifth step of generating a predicted image by performing motion compensation using the inter-picture prediction mode indicated by the decoded prediction mode information, wherein the third step and the fourth step are the plurality of references. A plurality of common blocks are used as block candidates, and the first predetermined order for generating the first candidate list in the third step And the second predetermined order for generating the second candidate list in the fourth step is different from the second predetermined list, and the plurality of reference blocks are already decoded spatially adjacent to the decoding target block. includes a block, the blocks included in the picture and temporally different picture including the current block, Oite the fourth steps, in deriving the predicted motion vector from said plurality of reference blocks, the time a rank in the block said second predetermined rank included in a different picture, the spatially lower than rank in the second specified rank order in the adjacent blocks, already encoded adjacent to said spatial Among the plurality of blocks, a block arranged on the left side of the encoding target block is arranged on the left block group, on the upper side of the encoding target block. A block representing an upper block group, a candidate representing the block group is derived from the block group, and the second predetermined order is determined in the order of the left block group candidate and the upper block group candidate. Is provided to generate the second candidate list.
It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

Claims

An image decoding device that decodes a code string encoded using a motion vector in units of blocks obtained by dividing each picture of a moving image,
Code for decoding prediction mode information indicating the inter-picture prediction mode and the first index, or prediction mode information indicating the inter-picture prediction mode, the second index, and the difference motion vector for each block to be decoded from the code string. A column decoding unit;
An acquisition unit that acquires encoding information of a plurality of reference blocks of the decoding target block;
When the inter-picture prediction mode indicated by the prediction mode information decoded by the code string decoding unit is the first inter-picture prediction mode using the motion vector information included in the coding information of the reference block specified by the index In addition, the first candidate list is generated by deriving the encoded information from the plurality of reference blocks based on the first predetermined order, and based on the first index decoded by the code string decoding unit, A first mode output unit that identifies the first candidate from the first candidate list and outputs the encoding information of the first candidate;
When the inter-picture prediction mode indicated by the prediction mode information decoded by the code string decoding unit is the second inter-picture prediction mode using the differential motion vector corresponding to the reference block specified by the index, A second candidate list is generated by deriving a motion vector predictor from the plurality of reference blocks based on a predetermined order, and the second candidate is generated based on the second index decoded by the code string decoding unit. A second mode in which a second candidate is identified from the list, and a motion vector of the decoding target block is calculated and output from the predicted motion vector of the second candidate and the difference motion vector decoded by the code string decoding unit An output section;
Based on the information output from the first mode output unit or the second mode output unit, motion compensation is performed using the inter-picture prediction mode indicated by the prediction mode information decoded by the code string decoding unit. A motion compensation prediction unit that generates a predicted image,
The first mode output unit and the second mode output unit use a plurality of common blocks as the plurality of reference blocks,
The first predetermined order for the first mode output unit to generate the first candidate list, and the second predetermined order for the second mode output unit to generate the second candidate list . Unlike the predetermined order,
The plurality of reference blocks include an already decoded block spatially adjacent to the decoding target block and a block included in a picture temporally different from a picture including the decoding target block,
Before Symbol second mode output unit,
When deriving a motion vector predictor from the plurality of reference blocks, the second predetermined rank of the spatially adjacent blocks is represented by the rank of the blocks included in the temporally different pictures in the second predetermined rank. Set lower than the ranking in
Of the plurality of already encoded blocks that are spatially adjacent, the block arranged on the left side of the encoding target block is the left block group, and the block arranged above the encoding target block is the upper block group A candidate representing the block group is derived from the block group, and the second predetermined order is provided in the order of the left block group candidate and the upper block group candidate, An image decoding device characterized by generating a candidate list.

An image decoding method for decoding a code string encoded using a motion vector in units of blocks obtained by dividing each picture of a moving image,
For each decoding target block, the prediction mode information indicating the inter-picture prediction mode and the first index, or the prediction mode information indicating the inter-picture prediction mode, the second index, and the difference motion vector are decoded for each block to be decoded. One step,
A second step of acquiring encoding information of a plurality of reference blocks of the decoding target block;
When the inter-picture prediction mode indicated by the prediction mode information decoded in the first step is the first inter-picture prediction mode that uses information on motion vectors included in the encoded information of the reference block specified by the index. The first candidate list is generated by deriving encoded information from the plurality of reference blocks based on a first predetermined order, and the first index is decoded based on the first index decoded in the first step. A third step of identifying a first candidate from one candidate list and outputting the encoding information of the first candidate;
When the inter-picture prediction mode indicated by the prediction mode information decoded in the first step is the second inter-picture prediction mode using the differential motion vector corresponding to the reference block specified by the index, the second predetermined Based on the ranking, a motion vector predictor is derived from the plurality of reference blocks to generate a second candidate list, and based on the second index decoded in the first step, A fourth step of specifying a second candidate, calculating a motion vector of the decoding target block from the prediction motion vector of the second candidate and the differential motion vector decoded in the first step, and outputting the calculated motion vector;
Based on the information output in the third step or the fourth step, a predicted image is generated by performing motion compensation using the inter-picture prediction mode indicated by the prediction mode information decoded in the first step. And comprising steps
The third step and the fourth step use a plurality of common blocks as the plurality of reference block candidates,
The first predetermined order for generating the first candidate list in the third step is different from the second predetermined order for generating the second candidate list in the fourth step,
The plurality of reference blocks include an already decoded block spatially adjacent to the decoding target block and a block included in a picture temporally different from a picture including the decoding target block,
Oite to the fourth steps,
When deriving a motion vector predictor from the plurality of reference blocks, the second predetermined rank of the spatially adjacent blocks is represented by the rank of the blocks included in the temporally different pictures in the second predetermined rank. Set lower than the ranking in
Of the plurality of already encoded blocks that are spatially adjacent, the block arranged on the left side of the encoding target block is the left block group, and the block arranged above the encoding target block is the upper block group A candidate representing the block group is derived from the block group, and the second predetermined order is provided in the order of the left block group candidate and the upper block group candidate, A candidate decoding list is generated.

An image decoding program for decoding a code string encoded using a motion vector in units of blocks obtained by dividing each picture of a moving image,
For each decoding target block, the prediction mode information indicating the inter-picture prediction mode and the first index, or the prediction mode information indicating the inter-picture prediction mode, the second index, and the difference motion vector are decoded for each block to be decoded. One step,
A second step of acquiring encoding information of a plurality of reference blocks of the decoding target block;
When the inter-picture prediction mode indicated by the prediction mode information decoded in the first step is the first inter-picture prediction mode that uses information on motion vectors included in the encoded information of the reference block specified by the index. The first candidate list is generated by deriving encoded information from the plurality of reference blocks based on a first predetermined order, and the first index is decoded based on the first index decoded in the first step. A third step of identifying a first candidate from one candidate list and outputting the encoding information of the first candidate;
When the inter-picture prediction mode indicated by the prediction mode information decoded in the first step is the second inter-picture prediction mode using the differential motion vector corresponding to the reference block specified by the index, the second predetermined Based on the ranking, a motion vector predictor is derived from the plurality of reference blocks to generate a second candidate list, and based on the second index decoded in the first step, A fourth step of specifying a second candidate, calculating a motion vector of the decoding target block from the prediction motion vector of the second candidate and the differential motion vector decoded in the first step, and outputting the calculated motion vector;
Based on the information output in the third step or the fourth step, a predicted image is generated by performing motion compensation using the inter-picture prediction mode indicated by the prediction mode information decoded in the first step. Step to the computer,
The third step and the fourth step use a plurality of common blocks as the plurality of reference block candidates,
The first predetermined order for generating the first candidate list in the third step is different from the second predetermined order for generating the second candidate list in the fourth step,
The plurality of reference blocks include an already decoded block spatially adjacent to the decoding target block and a block included in a picture temporally different from a picture including the decoding target block,
Oite to the fourth steps,
When deriving a motion vector predictor from the plurality of reference blocks, the second predetermined rank of the spatially adjacent blocks is represented by the rank of the blocks included in the temporally different pictures in the second predetermined rank. Set lower than the ranking in
Of the plurality of already encoded blocks that are spatially adjacent, the block arranged on the left side of the encoding target block is the left block group, and the block arranged above the encoding target block is the upper block group A candidate representing the block group is derived from the block group, and the second predetermined order is provided in the order of the left block group candidate and the upper block group candidate, An image decoding program characterized by generating a candidate list.

A receiving device that receives and decodes a code string in which a moving image is encoded,
A receiving unit that receives an encoded stream in which a code sequence encoded using a motion vector in units of blocks obtained by dividing each picture of a moving image is packetized;
A restoration unit that packet-processes the received packetized coded stream to restore the original code string;
For each decoding target block from the restored original code string, prediction mode information indicating the inter-picture prediction mode and the first index, or prediction mode information indicating the inter-picture prediction mode, the second index, and the difference motion vector. A code string decoding unit for decoding
An acquisition unit that acquires encoding information of a plurality of reference blocks of the decoding target block;
When the inter-picture prediction mode indicated by the prediction mode information decoded by the code string decoding unit is the first inter-picture prediction mode using the motion vector information included in the coding information of the reference block specified by the index In addition, the first candidate list is generated by deriving the encoded information from the plurality of reference blocks based on the first predetermined order, and based on the first index decoded by the code string decoding unit, A first mode output unit that identifies the first candidate from the first candidate list and outputs the encoding information of the first candidate;
When the inter-picture prediction mode indicated by the prediction mode information decoded by the code string decoding unit is the second inter-picture prediction mode using the differential motion vector corresponding to the reference block specified by the index, A second candidate list is generated by deriving a motion vector predictor from the plurality of reference blocks based on a predetermined order, and the second candidate is generated based on the second index decoded by the code string decoding unit. A second mode in which a second candidate is identified from the list, and a motion vector of the decoding target block is calculated and output from the predicted motion vector of the second candidate and the difference motion vector decoded by the code string decoding unit An output section;
Based on the information output from the first mode output unit or the second mode output unit, motion compensation is performed using the inter-picture prediction mode indicated by the prediction mode information decoded by the code string decoding unit. A motion compensation prediction unit that generates a predicted image,
The first mode output unit and the second mode output unit use a plurality of common blocks as the plurality of reference blocks,
The first predetermined order for the first mode output unit to generate the first candidate list, and the second predetermined order for the second mode output unit to generate the second candidate list . Unlike the predetermined order,
The plurality of reference blocks include an already decoded block spatially adjacent to the decoding target block and a block included in a picture temporally different from a picture including the decoding target block,
Before Symbol second mode output unit,
When deriving a motion vector predictor from the plurality of reference blocks, the second predetermined rank of the spatially adjacent blocks is represented by the rank of the blocks included in the temporally different pictures in the second predetermined rank. Set lower than the ranking in
Of the plurality of already encoded blocks that are spatially adjacent, the block arranged on the left side of the encoding target block is the left block group, and the block arranged above the encoding target block is the upper block group A candidate representing the block group is derived from the block group, and the second predetermined order is provided in the order of the left block group candidate and the upper block group candidate, Generating a candidate list.

A receiving method for receiving and decoding a code string in which a moving image is encoded,
A reception step of receiving an encoded stream in which a code sequence encoded using a motion vector in units of blocks obtained by dividing each picture of a moving image is packetized;
A restoration step of packetizing the received packetized coded stream to restore the original code sequence;
For each decoding target block from the restored original code string, prediction mode information indicating the inter-picture prediction mode and the first index, or prediction mode information indicating the inter-picture prediction mode, the second index, and the difference motion vector. A first step of decoding
A second step of acquiring encoding information of a plurality of reference blocks of the decoding target block;
When the inter-picture prediction mode indicated by the prediction mode information decoded in the first step is the first inter-picture prediction mode that uses information on motion vectors included in the encoded information of the reference block specified by the index. The first candidate list is generated by deriving encoded information from the plurality of reference blocks based on a first predetermined order, and the first index is decoded based on the first index decoded in the first step. A third step of identifying a first candidate from one candidate list and outputting the encoding information of the first candidate;
When the inter-picture prediction mode indicated by the prediction mode information decoded in the first step is the second inter-picture prediction mode using the differential motion vector corresponding to the reference block specified by the index, the second predetermined Based on the ranking, a motion vector predictor is derived from the plurality of reference blocks to generate a second candidate list, and based on the second index decoded in the first step, A fourth step of specifying a second candidate, calculating a motion vector of the decoding target block from the prediction motion vector of the second candidate and the differential motion vector decoded in the first step, and outputting the calculated motion vector;
Based on the information output in the third step or the fourth step, a predicted image is generated by performing motion compensation using the inter-picture prediction mode indicated by the prediction mode information decoded in the first step. And comprising steps
The third step and the fourth step use a plurality of common blocks as the plurality of reference block candidates,
The first predetermined order for generating the first candidate list in the third step is different from the second predetermined order for generating the second candidate list in the fourth step,
The plurality of reference blocks include an already decoded block spatially adjacent to the decoding target block and a block included in a picture temporally different from a picture including the decoding target block,
Oite to the fourth steps,
When deriving a motion vector predictor from the plurality of reference blocks, the second predetermined rank of the spatially adjacent blocks is represented by the rank of the blocks included in the temporally different pictures in the second predetermined rank. Set lower than the ranking in
Of the plurality of already encoded blocks that are spatially adjacent, the block arranged on the left side of the encoding target block is the left block group, and the block arranged above the encoding target block is the upper block group A candidate representing the block group is derived from the block group, and the second predetermined order is provided in the order of the left block group candidate and the upper block group candidate, Generating a candidate list.

A receiving program for receiving and decoding a code string in which a moving image is encoded,
A reception step of receiving an encoded stream in which a code sequence encoded using a motion vector in units of blocks obtained by dividing each picture of a moving image is packetized;
A restoration step of packetizing the received packetized coded stream to restore the original code sequence;
For each decoding target block from the restored original code string, prediction mode information indicating the inter-picture prediction mode and the first index, or prediction mode information indicating the inter-picture prediction mode, the second index, and the difference motion vector. A first step of decoding
A second step of acquiring encoding information of a plurality of reference blocks of the decoding target block;
When the inter-picture prediction mode indicated by the prediction mode information decoded in the first step is the first inter-picture prediction mode that uses information on motion vectors included in the encoded information of the reference block specified by the index. The first candidate list is generated by deriving encoded information from the plurality of reference blocks based on a first predetermined order, and the first index is decoded based on the first index decoded in the first step. A third step of identifying a first candidate from one candidate list and outputting the encoding information of the first candidate;
When the inter-picture prediction mode indicated by the prediction mode information decoded in the first step is the second inter-picture prediction mode using the differential motion vector corresponding to the reference block specified by the index, the second predetermined Based on the ranking, a motion vector predictor is derived from the plurality of reference blocks to generate a second candidate list, and based on the second index decoded in the first step, A fourth step of specifying a second candidate, calculating a motion vector of the decoding target block from the prediction motion vector of the second candidate and the differential motion vector decoded in the first step, and outputting the calculated motion vector;
Based on the information output in the third step or the fourth step, a predicted image is generated by performing motion compensation using the inter-picture prediction mode indicated by the prediction mode information decoded in the first step. Step to the computer,
The third step and the fourth step use a plurality of common blocks as the plurality of reference block candidates,
The first predetermined order for generating the first candidate list in the third step is different from the second predetermined order for generating the second candidate list in the fourth step,
The plurality of reference blocks include an already decoded block spatially adjacent to the decoding target block and a block included in a picture temporally different from a picture including the decoding target block,
Oite to the fourth steps,
When deriving a motion vector predictor from the plurality of reference blocks, the second predetermined rank of the spatially adjacent blocks is represented by the rank of the blocks included in the temporally different pictures in the second predetermined rank. Set lower than the ranking in
Of the plurality of already encoded blocks that are spatially adjacent, the block arranged on the left side of the encoding target block is the left block group, and the block arranged above the encoding target block is the upper block group A candidate representing the block group is derived from the block group, and the second predetermined order is provided in the order of the left block group candidate and the upper block group candidate, A receiving program characterized by generating a candidate list.