JP2014220785A5

JP2014220785A5 -

Info

Publication number: JP2014220785A5
Application number: JP2014023251A
Authority: JP
Filing date: 2014-02-10
Publication date: 2017-01-05
Anticipated expiration: 2034-02-10

Description

上記課題を解決するために、本発明のある態様の画像符号化装置は、予測ブロック単位でイントラ予測モードに関する情報を符号化して、変換ブロック単位で輝度信号と色差信号とを含む画像信号をイントラ予測を用いて符号化する画像符号化装置であって、輝度信号の予測ブロック毎に、輝度信号のイントラ予測モードを設定し、前記輝度信号のイントラ予測モードに応じて、輝度信号の変換ブロックの周囲の輝度信号から前記輝度信号の変換ブロックの輝度信号を予測する輝度信号イントラ予測部（１０３）と、色差信号の予測ブロック毎に、色差信号のイントラ予測モードを設定し、前記色差信号のイントラ予測モードに応じて、色差信号の変換ブロックの周囲の色差信号から前記色差信号の変換ブロックの色差信号を予測する色差信号イントラ予測部（１０３）と、前記輝度信号のイントラ予測モードに関するシンタックス要素を符号化するイントラ輝度予測モード符号化部（１２２、１２６）と、前記色差信号のイントラ予測モードに関するシンタックス要素を符号化するイントラ色差予測モード符号化部（１２３、１２６）とを備え、前記色差信号イントラ予測部（１０３）は、前記輝度信号と前記色差信号の画素のアスペクト比が異なる場合、前記アスペクト比が同じ場合に使用する第１の色差信号のイントラ予測モードのモード番号を変換して、前記アスペクト比が異なる場合に使用する第２の色差信号のイントラ予測モードを導出する。 In order to solve the above problems, an image encoding apparatus according to an aspect of the present invention encodes information related to an intra prediction mode in units of prediction blocks, and converts an image signal including a luminance signal and a color difference signal into units of transform blocks. an image encoding apparatus for encoding using a prediction, for each predicted block of the luminance signal, to set the intra prediction mode of the luminance signal, in accordance with the into La prediction mode of the luminance signal, converts the luminance signal A luminance signal intra prediction unit (103) for predicting a luminance signal of a conversion block of the luminance signal from luminance signals around the block; and a color difference signal intra prediction mode is set for each prediction block of the color difference signal, and the color difference signal depending on the into La prediction mode, color predicting color difference signals of the transform block of the color difference signals from the color difference signals of the surrounding transform blocks of the color difference signals Sashin Intra prediction unit (103), said intra luminance prediction mode encoding unit that marks-coding syntax elements related to intra-prediction mode of the luminance signal and (122, 126), the syntax element related to the intra prediction mode of the color difference signal comprising an intra chrominance prediction mode encoding unit that marks No. of the (123 and 126), the chrominance signal intra prediction unit (103), when the aspect ratio of pixels of the luminance signal and the color difference signal are different, the aspect ratio Are converted into the intra-prediction mode mode number of the first chrominance signal used when the aspect ratio is different, and the intra-prediction mode of the second chrominance signal used when the aspect ratio is different is derived.

本発明の別の態様は、画像符号化方法である。この方法は、予測ブロック単位でイントラ予測モードに関する情報を符号化して、変換ブロック単位で輝度信号と色差信号とを含む画像信号をイントラ予測を用いて符号化する画像符号化方法であって、輝度信号の予測ブロック毎に、輝度信号のイントラ予測モードを設定し、前記輝度信号のイントラ予測モードに応じて、輝度信号の変換ブロックの周囲の輝度信号から前記輝度信号の変換ブロックの輝度信号を予測する輝度信号イントラ予測ステップと、色差信号の予測ブロック毎に、色差信号のイントラ予測モードを設定し、前記色差信号のイントラ予測モードに応じて、色差信号の変換ブロックの周囲の色差信号から前記色差信号の変換ブロックの色差信号を予測する色差信号イントラ予測ステップと、前記輝度信号のイントラ予測モードに関するシンタックス要素を符号化するイントラ輝度予測モード符号化ステップと、前記色差信号のイントラ予測モードに関するシンタックス要素を符号化するイントラ色差予測モード符号化ステップとを有し、前記色差信号イントラ予測ステップは、前記輝度信号と前記色差信号の画素のアスペクト比が異なる場合、前記アスペクト比が同じ場合に使用する第１の色差信号のイントラ予測モードのモード番号を変換して、前記アスペクト比が異なる場合に使用する第２の色差信号のイントラ予測モードを導出する。 Another aspect of the present invention is an image encoding method. This method is to encode information about the intra prediction mode in the prediction block, an image coding method for coding using intra prediction image signal including a luminance signal and color difference signals by the conversion block, luminance for each prediction block signals, set the intra prediction mode of the luminance signal, in response to said into La prediction mode of the luminance signal, the luminance signal of the transform block of the luminance signal from the luminance signal around the transform blocks of the luminance signal a luminance signal intra prediction step for predicting, for each predicted block of the color difference signals, and sets the intra prediction mode of the color difference signals, in accordance with the into La prediction mode of the color difference signals, the color difference around the transform block of the color difference signals a chrominance signal intra prediction step for predicting the color difference signals of the transform block of the color difference signal from the signal, the intra prediction mode of the luminance signal Has an intra brightness prediction mode encoding step of sign-the syntax elements related to de, the intra chrominance prediction mode encoding step of sign-the syntax elements related to intra-prediction mode of the color difference signals, the color difference signal In the intra prediction step, when the aspect ratios of the pixels of the luminance signal and the color difference signal are different, the mode number of the intra prediction mode of the first color difference signal used when the aspect ratio is the same is converted, and the aspect ratio is converted. The intra prediction mode of the second color difference signal to be used when is different is derived.

Claims

An image encoding device that encodes information about an intra prediction mode in units of prediction blocks and encodes an image signal including a luminance signal and a color difference signal in units of transform blocks using intra prediction,
For each predicted block of the luminance signal, to set the intra prediction mode of the luminance signal, in response to said Into La prediction mode of the luminance signal, the luminance of the converted block of the luminance signal from the luminance signal around the transform blocks of the luminance signal A luminance signal intra prediction unit for predicting a signal;
For each prediction block of the color difference signals, and sets the intra prediction mode of the color difference signals, in accordance with the Into La prediction mode of the color difference signals, color difference conversion block of the color difference signals from the color difference signals of the surrounding transform blocks of the color difference signals A color difference signal intra prediction unit for predicting a signal;
Intra brightness prediction mode encoding unit that marks-coding syntax elements related to intra-prediction mode of the luminance signal,
A intra chrominance prediction mode encoding unit that marks-coding syntax elements related to intra-prediction mode of the color difference signals,
The color difference signal intra prediction unit converts the mode number of the intra prediction mode of the first color difference signal to be used when the aspect ratio of the pixels of the luminance signal and the color difference signal is different from each other, An image encoding apparatus for deriving an intra prediction mode of a second color difference signal to be used when the aspect ratios are different .

An image encoding method that encodes information about an intra prediction mode in units of prediction blocks and encodes an image signal including a luminance signal and a color difference signal in units of transform blocks using intra prediction,
For each predicted block of the luminance signal, to set the intra prediction mode of the luminance signal, in response to said Into La prediction mode of the luminance signal, the luminance of the converted block of the luminance signal from the luminance signal around the transform blocks of the luminance signal A luminance signal intra prediction step for predicting the signal;
For each prediction block of the color difference signals, and sets the intra prediction mode of the color difference signals, in accordance with the Into La prediction mode of the color difference signals, color difference conversion block of the color difference signals from the color difference signals of the surrounding transform blocks of the color difference signals A color difference signal intra prediction step for predicting a signal;
Intra brightness prediction mode encoding step of sign-the syntax elements related to intra-prediction mode of the luminance signal,
And a intra chrominance prediction mode encoding step of sign-the syntax elements related to intra-prediction mode of the color difference signals,
In the color difference signal intra prediction step, when the aspect ratio of the pixel of the luminance signal and the color difference signal is different, the mode number of the intra prediction mode of the first color difference signal used when the aspect ratio is the same is converted, An image encoding method, wherein an intra prediction mode of a second color difference signal used when the aspect ratios are different is derived .

An image encoding program that encodes information related to an intra prediction mode in units of prediction blocks and encodes an image signal including a luminance signal and a color difference signal in units of transform blocks using intra prediction,
An image encoding method that encodes information about an intra prediction mode in units of prediction blocks and encodes an image signal including a luminance signal and a color difference signal in units of transform blocks using intra prediction,
For each predicted block of the luminance signal, to set the intra prediction mode of the luminance signal, in response to said Into La prediction mode of the luminance signal, the luminance of the converted block of the luminance signal from the luminance signal around the transform blocks of the luminance signal A luminance signal intra prediction step for predicting the signal;
For each prediction block of the color difference signals, and sets the intra prediction mode of the color difference signals, in accordance with the Into La prediction mode of the color difference signals, color difference conversion block of the color difference signals from the color difference signals of the surrounding transform blocks of the color difference signals A color difference signal intra prediction step for predicting a signal;
Intra brightness prediction mode encoding step of sign-the syntax elements related to intra-prediction mode of the luminance signal,
To execute the intra-color difference prediction mode encoding step of sign-the syntax elements related to intra-prediction mode of the color difference signal to the computer,
In the color difference signal intra prediction step, when the aspect ratio of the pixel of the luminance signal and the color difference signal is different, the mode number of the intra prediction mode of the first color difference signal used when the aspect ratio is the same is converted, An image encoding program for deriving an intra prediction mode of a second color difference signal to be used when the aspect ratios are different .