JP2013034037A5

JP2013034037A5 -

Info

Publication number: JP2013034037A5
Application number: JP2011161053A
Authority: JP
Filing date: 2011-07-22
Publication date: 2014-09-04

Description

上述の課題を解決するため、本発明の画像符号化方法は以下の構成を有する。すなわち、複数のブロックを含む画像を、前記ブロック単位で符号化する画像符号化方法であって、処理の対象となる処理対象ブロックの属性情報を取得する第１の取得工程と、前記処理対象ブロックの画質を制御する第１のパラメータを取得する第２の取得工程と、前記取得された属性情報と、他のブロックの属性情報とに基づいて、前記他のブロックに対応する第２のパラメータを決定する決定工程と、前記取得された前記第１のパラメータと、前記第２のパラメータとの差分値を取得する第３の取得工程と、取得された前記差分値を符号化する符号化工程と、を備えることを特徴とする。
また、上述の課題を解決するため、本発明の画像復号方法は以下の構成を有する。すなわち、複数のブロックを含む画像を当該ブロック単位で符号化された符号化データを復号する画像復号方法であって、前記符号化データのうち、処理の対象となる処理対象のブロックの属性情報に関する符号化データと、前記処理対象のブロックのパラメータと他のブロックとのパラメータの差分値に関する符号化データとを、復号する復号工程と、前記復号された属性情報に基づいて、前記他のブロックの画質を制御する第１のパラメータを取得する第１の取得工程と、前記第１の取得工程で取得された前記第１のパラメータと、前記復号工程で生成された前記差分値とから、前記処理対象ブロックの画質を制御する第２のパラメータを取得する第２の取得工程と、を有することを特徴とする画像復号方法。 In order to solve the above-described problems, the image encoding method of the present invention has the following configuration. That is, an image encoding method for encoding an image including a plurality of blocks in units of blocks, the first acquisition step of acquiring attribute information of a processing target block to be processed, and the processing target block Based on the second acquisition step of acquiring the first parameter for controlling the image quality of the image, the acquired attribute information, and the attribute information of the other block, the second parameter corresponding to the other block is determined. A determination step for determining, a third acquisition step for acquiring a difference value between the acquired first parameter and the second parameter, and an encoding step for encoding the acquired difference value; , characterized in that it comprises a.
Moreover, in order to solve the above-mentioned subject, the image decoding method of this invention has the following structures. That is, an image decoding method for decoding encoded data obtained by encoding an image including a plurality of blocks in units of the block, and relates to attribute information of a processing target block to be processed among the encoded data A decoding step of decoding encoded data and encoded data related to a difference value between a parameter of the processing target block and another block; and the other block based on the decoded attribute information From the first acquisition step of acquiring a first parameter for controlling image quality, the first parameter acquired in the first acquisition step, and the difference value generated in the decoding step, the processing A second acquisition step of acquiring a second parameter for controlling the image quality of the target block.

Claims

An image including multiple blocks, an image coding method for sign-reduction in the block unit,
A first acquisition step of acquiring attribute information of the target block to be processed,
A second acquisition step of acquiring a first parameter for controlling the image quality of the processing target block;
A determination step of determining a second parameter corresponding to the other block based on the acquired attribute information and the attribute information of the other block ;
It said first parameter the acquired, a third obtaining step of obtaining a difference value between said second parameter,
An encoding step for encoding the acquired difference value,
An image encoding method comprising:

In the determining step, a parameter for controlling image quality of the other block having an attribute corresponding to the attribute information encoded before the block to be processed is set as the second parameter. The image encoding method according to claim 1.

3. The image encoding according to claim 1, wherein in the determination step, a parameter corresponding to the other block having the same or close attribute as the attribute information is set as the second parameter. Method.

In the determination step, when there are a plurality of blocks having the same or close attribute as the attribute information, a parameter corresponding to the other block having a spatial distance closest to the processing target block is set as the second parameter. The image encoding method according to any one of claims 1 to 3, wherein the image encoding method is defined as follows.

2. The determining step according to claim 1, wherein the second parameter is an average value or a median value of parameters that control image quality of a plurality of blocks having the same or close attribute as the attribute information. 5. The image encoding method according to any one of 4.

2. The determination step according to claim 1, wherein a parameter corresponding to the other block encoded last among the blocks having the same attribute as the attribute information is set as the second parameter. The image encoding method according to claim 5.

7. The method according to claim 1, wherein the first acquisition step includes at least one of an intra prediction method indicating a block size, a prediction mode, a motion vector, and a direction in intra prediction. The image encoding method according to item.

The determining step uses a parameter for controlling the image quality of the other block having an attribute corresponding to the attribute information among blocks around the processing target block as the second parameter. The image encoding method according to any one of claims 1 to 7.

In the determination step, a parameter that controls the image quality of the other block having an attribute corresponding to the attribute information among blocks adjacent to the left, top, or top right of the processing target block is the second parameter. The image encoding method according to any one of claims 1 to 8, wherein the image encoding method is performed.

The attribute information includes a prediction mode indicating whether the block is an inter block or an intra block,
In the determining step, when the processing target block is an inter block, a parameter corresponding to the other block that is an inter block among the other blocks of the processing target block is set as the second parameter, When the processing target lock is an intra block, a parameter corresponding to the other block that is an intra block among the other blocks of the processing target block is set as the second parameter. The image encoding method according to any one of claims 1 to 9.

The determining step includes determining, as the second parameter, a parameter that controls an image quality of a left block of the processing target block when there is no block having an attribute that is the same as or close to the attribute information. The image encoding method according to any one of claims 1 to 10.

Furthermore, the fourth block acquires information on whether another block of the processing target block is a block having the same or close attribute as the attribute information or a block not having the same or close attribute as the attribute information. Has the acquisition process of
In the fourth acquisition step, when the determination step acquires information indicating that a block around the processing target block is a block that does not have the same or close attribute as the attribute information, the processing target 12. The second parameter is determined based on a difference between each parameter that controls image quality of blocks around the block and the first parameter. The image encoding method according to item.

The attribute information includes information related to the motion vector of the block.
The determination means has an absolute value of a difference between a motion vector corresponding to the other block and a motion vector corresponding to the processing target block among other blocks of the processing target block smaller than a first predetermined value. The image encoding method according to any one of claims 1 to 12, wherein a parameter corresponding to the other block is the second parameter.

The second acquisition step acquires the first parameter for controlling the code amount of encoded data obtained by encoding the processing target block to be a second predetermined value set in advance. The image encoding method according to any one of claims 1 to 13.

An image decoding method for decoding encoded data obtained by encoding an image including a plurality of blocks in units of the block ,
Wherein among the encoded data, encoded data related to the attribute information of the block to be processed to be processed, and a coded data relating to the difference value of the parameter between the parameter and the other block of the block of the processing object, decoding A decryption step to
Based on the decoded attribute information, a first acquisition step of acquiring a first parameter for controlling the quality of the other blocks,
Said first parameter acquired by the first acquisition step, from said difference value generated in the decoding step, a second acquisition for acquiring a second parameter for controlling the quality of the target block Process,
An image decoding method characterized by comprising:

An image encoding device that encodes an image including a plurality of blocks in units of blocks,
First acquisition means for acquiring attribute information of a processing target block to be processed;
Second acquisition means for acquiring a first parameter for controlling image quality of the processing target block;
Determining means for determining a second parameter corresponding to the other block based on the acquired attribute information and the attribute information of the other block;
Third acquisition means for acquiring a difference value between the acquired first parameter and the second parameter;
Encoding means for encoding the obtained difference value;
An image encoding device comprising:

An image decoding device that decodes encoded data obtained by encoding an image including a plurality of blocks in units of the block,
Among the encoded data, decoding is performed on encoded data related to attribute information of a processing target block to be processed, and encoded data related to a difference value between a parameter of the processing target block and a parameter of another block. Decryption means to
First acquisition means for acquiring a first parameter for controlling the image quality of the other block based on the decoded attribute information;
Second acquisition for acquiring a second parameter for controlling the image quality of the processing target block from the first parameter acquired by the first acquisition unit and the difference value generated by the decoding unit. Means,
An image decoding apparatus comprising:

The program for functioning a computer as each means of the image coding apparatus of Claim 16.

The program for functioning a computer as each means of the image decoding apparatus of Claim 17.