Image encoding and decoding method and apparatus generating an angular intra prediction mode

Patent metadata

Field	Value
Publication number	US-2023164323-A1
Application number	US-202318151570-A
Country	US
Kind code	A1
Filing date	Jan 9, 2023
Priority date	Sep 28, 2017
Publication date	May 25, 2023
Grant date	—

Abstract

Provided is an image decoding method including: generating an intra prediction value of a current sample based on a position of the current sample in a current block and an intra prediction mode of the current block; determining a sample value of at least one filtering reference sample to be filtered and a first weight with respect to the filtering reference sample and a second weight with respect to the intra prediction value of the current sample; generating a filtered prediction sample value of the current sample based on the determined sample value of the filtering reference sample to be filtered, the intra prediction value of the current sample, the first weight with respect to the filtering reference sample, and the second weight with respect to the intra prediction value of the current sample; and generating a prediction block of the current block including the filtered prediction sample value.

First claim

1 . An image decoding method comprising:
obtaining an intra prediction sample of a current sample in a current block based on an intra prediction mode of the current block; when the intra prediction mode of the current block is an angular mode with one among upper prediction directions including an upper-right prediction direction, determining a reference sample among a plurality of reference samples in a left side of the current block based on a position of the current sample and the intra prediction mode of the current block and determining a first weight for the reference sample based on a X-coordinate of the position of the current sample; obtaining a modified intra prediction sample of the current sample based on the reference sample, the intra prediction sample of the current sample, the first weight for the reference sample and a second weight for the intra prediction sample of the current sample; and reconstructing the current block using the modified intra prediction sample of the current sample and a residual sample of the current sample.

2 . The image decoding method, further comprising:
when the intra prediction mode of the current block is an angular mode with one among left prediction directions including a lower-left prediction direction, determining a reference sample among a plurality of reference samples in an upper side of the current block based on the position of the current sample and the intra prediction mode of the current block and determining a first weight for the reference sample among the plurality reference samples in the upper side of the current block based on a Y-coordinate of the position of the current sample.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Choi Na-Rae
• Jin Bo-Ra
• Park Min-Woo

Classifications

• H04N19/159

  Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction · CPC title

• H04N19/132 Primary

  Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking · CPC title

• H04N19/635

  characterised by filter definition or implementation details · CPC title

• H04N19/189

  characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding · CPC title

• H04N19/105 Primary

  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