IMAGE DECODING DEVICE, IMAGE ENCODING DEVICE, IMAGE DECODING METHOD, AND IMAGE ENCODING METHOD

To provide an image decoding device and an image encoding device that can eliminate the combination of transform skip, sign hiding, and dependent quantization, thereby achieving the effect of reducing the implementation costs of hardware and software.SOLUTION: In a device that decodes a transform sk...

Full description

Saved in:
Bibliographic Details
Main Authors IGAI TOMOHIRO, HASHIMOTO TOMONORI, SASAKI EIICHI, AONO TOMOKO
Format Patent
LanguageEnglish
Japanese
Published 11.06.2024
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
Online AccessGet full text

Cover

More Information
Summary:To provide an image decoding device and an image encoding device that can eliminate the combination of transform skip, sign hiding, and dependent quantization, thereby achieving the effect of reducing the implementation costs of hardware and software.SOLUTION: In a device that decodes a transform skip flag on the basis of a value of a transform skip enable flag, a value of BdpcmFlag, and a transform block size, and derives a transform coefficient value using a scale value, when the value of the transform skip flag is 0 or the value of the transform skip residual coding disable flag is 1, normal prediction error coding is used, and in other cases, transform skip prediction error coding is used, and the scale value is derived by switching between at least two derivation methods on the basis of the value of the transform skip flag.SELECTED DRAWING: Figure 14b 【課題】変換スキップとサインハイディング、依存量子化の組み合わせを取り除くことができ、ハードウェア、ソフトウェアの実装コストを軽減する効果を奏する画像復号装置及び画像符号化装置を提供する。【解決手段】変換スキップ有効フラグの値と、BdpcmFlagの値と、変換ブロックサイズとに基づいて、変換スキップフラグを復号し、スケール値を用いて、変換係数値を導出する装置において、変換スキップフラグの値が０、又は、変換スキップ残差符号化無効フラグの値が１の場合、通常の予測誤差符号化が使用され、その他の場合、変換スキップ予測誤差符号化が使用され、スケール値は、変換スキップフラグの値に基づいて、少なくとも２つの導出方法を切り替えて導出されることを特徴とする。【選択図】図14b
Bibliography:Application Number: JP20240059268