JP2011217104A5

JP2011217104A5 -

Info

Publication number: JP2011217104A5
Application number: JP2010083142A
Authority: JP
Filing date: 2010-03-31
Publication date: 2013-04-04
Anticipated expiration: 2030-03-31

Description

上記課題を解決するために、本発明のある態様の動画像符号化装置は、符号化対象ブロックに対して、第１の参照画像からの第１の動きベクトルを検出する動きベクトル検出部と、第１の動きベクトルを用いて第１の参照画像より抽出した、符号化対象ブロック以上の大きさを持つ特定領域の第１の参照ブロックと、他の少なくとも１つの参照画像の所定領域とを合成した合成参照ブロックを生成する参照画像合成部と、合成参照ブロックに対して特定領域内を探索することにより、符号化対象ブロックに対応する第２の動きベクトルを検出し、第２の動きベクトルを用いて、符号化対象ブロックと同じ大きさのブロックを合成参照ブロックより抽出し、その抽出したブロックを予測ブロックとする動き補償予測部と、予測ブロックを符号化対象ブロックより減算した予測差分ブロックと、第２の動きベクトルとを符号化する符号化部とを備える。 In order to solve the above-described problem, a moving image encoding device according to an aspect of the present invention includes a motion vector detection unit that detects a first motion vector from a first reference image for an encoding target block; The first reference block of the specific area having a size larger than the encoding target block extracted from the first reference image using the first motion vector and the predetermined area of at least one other reference image are combined. A reference image synthesizing unit that generates the synthesized reference block, and a second motion vector corresponding to the encoding target block is detected by searching in the specific area with respect to the synthesized reference block, and the second motion vector is Using a motion compensation prediction unit that extracts a block having the same size as the encoding target block from the synthesis reference block and uses the extracted block as a prediction block, and encodes the prediction block It comprises a prediction difference block by subtracting from elephant block, and an encoding unit encoding a second motion vector.

Claims

A motion vector detection unit that detects a first motion vector from the first reference image with respect to the encoding target block;
The first reference block of the specific area having a size larger than the encoding target block extracted from the first reference image using the first motion vector and the predetermined area of at least one other reference image A reference image synthesis unit that generates a synthesized reference block that is synthesized with
A second motion vector corresponding to the encoding target block is detected by searching in the specific area for the synthesized reference block, and the encoding target block is detected using the second motion vector. A block having the same size is extracted from the synthesized reference block, and the motion compensated prediction unit having the extracted block as a prediction block;
A moving picture encoding apparatus comprising: a prediction difference block obtained by subtracting the prediction block from the encoding target block; and an encoding unit that encodes the second motion vector.

The accuracy of the first motion vector is N pixel accuracy (N is a real number), the accuracy of the second motion vector is M pixel accuracy (M is a real number: M <N),
The specific area is based on the position of the first reference image indicated by the first motion vector or the vector value obtained by converting the first motion vector to N pixel accuracy (N is a real number). together with the N / 2 pixels or more regions, the range for detecting the second motion vector, according to claim 1, characterized in that in the range of ± N / 2 with respect to the first motion vector value The moving image encoding apparatus described in 1.

The reference image synthesis unit includes an inter-reference image motion vector detection unit that detects a third motion vector between the first reference block and a second reference image that is another reference image.
The reference image synthesis unit includes an average value or a weighted average value for each pixel of the second reference block extracted from the second reference image using the third motion vector and the first reference block. by calculating the moving picture coding apparatus according to claim 1 or 2, characterized in that to generate the synthetic reference block.

The inter-reference image motion vector detection unit detects a plurality of third motion vectors between the first reference block and the second reference image in units of blocks smaller than the first reference block. And
The reference image synthesis unit combines a plurality of second reference blocks in small blocks extracted from the second reference image using the plurality of third motion vectors, and 4. The moving picture encoding apparatus according to claim 3 , wherein the synthesized reference block is generated by calculating an average value or a weighted average value for each pixel.

The inter-reference-picture motion vector detection unit is configured to perform two operations: a first time difference between the first reference picture and the encoding target block, and a second time difference between the second reference picture and the encoding target block. around the motion vector value obtained by converting the first motion vector in accordance with the time difference, by searching a motion within a predetermined range, according to claim 3 or 4, characterized in that detecting the third motion vector The moving image encoding apparatus described in 1.

Detecting a first motion vector from a first reference image for an encoding target block;
The first reference block of the specific area having a size larger than the encoding target block extracted from the first reference image using the first motion vector and the predetermined area of at least one other reference image Generating a composite reference block obtained by combining
A second motion vector corresponding to the encoding target block is detected by searching in the specific area for the synthesized reference block, and the encoding target block is detected using the second motion vector. Extracting a block of the same size from the synthesized reference block, and making the extracted block a prediction block;
A moving image encoding method comprising: a prediction difference block obtained by subtracting the prediction block from the encoding target block; and a step of encoding the second motion vector.

A function of detecting a first motion vector from a first reference image for a block to be encoded;
The first reference block of the specific area having a size larger than the encoding target block extracted from the first reference image using the first motion vector and the predetermined area of at least one other reference image A function to generate a composite reference block that combines
A second motion vector corresponding to the encoding target block is detected by searching in the specific area for the synthesized reference block, and the encoding target block is detected using the second motion vector. A function of extracting a block of the same size from the synthesized reference block and setting the extracted block as a prediction block;
A moving picture encoding program that causes a computer to realize a prediction difference block obtained by subtracting the prediction block from the encoding target block and a function of encoding the second motion vector.