Decoding device, encoding device, decoding method, encoding method, and non-transitory computer readable recording medium

Patent metadata

Field	Value
Publication number	US-12526433-B2
Application number	US-202418674791-A
Country	US
Kind code	B2
Filing date	May 24, 2024
Priority date	Jul 15, 2010
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A coding device and a decoding device are configured to include an estimated prediction mode deciding section (122a) including: a reference block selecting section (1223a) for selecting a reference block for use in estimating an intra-prediction mode for a subject block; an estimating number deciding section (1222a) for deciding an estimating number of estimated values to be estimated for the intra-prediction mode; and an estimated prediction mode deriving section (1221a) for estimating, based on a reference block, the estimating number of estimated values of the prediction mode.

First claim

The invention claimed is:

1 . A method of estimating an intra-prediction mode for a digital image having a plurality of blocks, the method comprising:
selecting, from an input image, two reference blocks that are located adjacent to a subject block; acquiring first prediction modes employed in the selected two reference blocks; determining that the acquired first prediction modes do not include a prediction mode comprising a planar mode or a direct current (DC) mode; and responsive to the determining, adding the prediction mode as a candidate prediction mode corresponding to the subject block, wherein responsive to determining that the acquired prediction modes do not include the planar mode and the DC mode, both the planar mode and the DC mode are added as candidate prediction modes corresponding to the subject block.

2 . The method of claim 1 , wherein the selected two reference blocks comprise:
a block that is located above the subject block; and a block that is located left of the subject block.

3 . The method of claim 1 , wherein the prediction mode comprises the planar mode.

4 . The method of claim 1 , wherein the prediction mode comprises the DC mode.

5 . A device for estimating an intra-prediction mode for a digital image having a plurality of blocks, the device comprising:
a circuit configured to perform operations comprising:
selecting, from an input image, two reference blocks that are located adjacent to a subject block;
acquiring first prediction modes employed in the selected two reference blocks;
determining that the acquired first prediction modes do not include a prediction mode comprising a planar mode or a direct current (DC) mode; and
responsive to the determining, adding the prediction mode as a candidate prediction mode corresponding to the subject block, wherein responsive to determining that the acquired prediction modes do not include the planar mode and the DC mode, both the planar mode and the DC mode are added as candidate prediction modes corresponding to the subject block.

6 . The device of claim 5 , wherein the two reference blocks comprise:
a block that is located above the subject block; and a block that is located left of the subject block.

7 . The device of claim 5 , wherein the prediction mode comprises the planar mode.

8 . The device of claim 5 , wherein the prediction mode comprises the DC mode.

9 . The device of claim 5 , wherein the device comprises an image encoding device.

10 . The device of claim 5 , wherein the device comprises an image decoding device.

11 . A non-transitory computer-readable medium having stored thereon instructions that are executable to perform operations for estimating an intra-prediction mode for a digital image having a plurality of blocks, the operations comprising:
selecting, from an input image, two reference blocks that are located adjacent to a subject block; acquiring first prediction modes employed in the selected two reference blocks; determining that the acquired first prediction modes do not include a prediction mode comprising a planar mode or a direct current (DC) mode; and responsive to the determining, adding the prediction mode as a candidate prediction mode corresponding to the subject block, wherein responsive to determining that the acquired prediction modes do not include the planar mode and the DC mode, both the planar mode and the DC mode are added as candidate prediction modes corresponding to the subject block.

12 . The non-transitory computer-readable medium of claim 11 , wherein the two reference blocks comprise:
a block that is located above the subject block; and a block that is located left of the subject block.

13 . The non-transitory computer-readable medium of claim 11 , wherein the prediction mode comprises the planar mode.

14 . The non-transitory computer-readable medium of claim 11 , wherein the prediction mode comprises the DC mode.

Assignees

• Velos Media Llc

Inventors

• Yasugi Yukinobu

Classifications

• H04N19/46

  Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence) · CPC title

• H04N19/105

  Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction · CPC title

• H04N19/50

  using predictive coding (H04N19/61 takes precedence) · CPC title

• H04N19/593

  involving spatial prediction techniques · CPC title

• H04N19/463

  by compressing encoding parameters before transmission · CPC title