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Image encoding/decoding method and device

a signal encoding and image technology, applied in the field of image signal encoding/decoding methods and devices, can solve the problems of reducing encoding efficiency and rapid increase in overhead, and achieve the effects of reducing the amount of encoding information generated as a result of encoding a video, enhancing encoding efficiency, and enhancing image reconstruction efficiency

Inactive Publication Date: 2019-11-28
IND ACAD COOP GRP OF SEJONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention can reduce the amount of encoding information and enhance the efficiency of video encoding. It can also improve the quality of the reconstructed image by adaptively decoding the encoded image. Additionally, it reduces the amount of metadata transmitted between the encoding and decoding devices, such as motion vectors, which improves encoding efficiency. Additionally, the invention can reduce the occurrence of blocking artifacts that may occur when different types of inter prediction are used.

Problems solved by technology

However, when multiple motions are present in a block, the block is partitioned into small parts, so that rapid increase in overhead may occur and encoding efficiency may be lowered.

Method used

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  • Image encoding/decoding method and device
  • Image encoding/decoding method and device

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first exemplary embodiment

[0152]FIGS. 5a and 5b are diagrams illustrating inter prediction using a reconstructed pixel region according to a first exemplary embodiment of the present invention. In the inter prediction using the reconstructed pixel region according to the embodiment, particularly, the motion vector of the current block may be derived using the reconstructed pixel region.

[0153]FIG. 5a shows a current block 51 to be encoded or decoded and a pre-reconstructed pixel region C 52 as a region adjacent to the current block 51. The current block 51 and the reconstructed pixel region C 52 are included in the current image 50. The current image 50 may be a picture, a slice, a tile, a coding tree block, a coding block, or other image regions. The reconstructed pixel region C 52 may correspond to a reconstructed pixel region after being encoded before encoding of the current block 51 in terms of encoding, and may be a pre-reconstructed region before decoding of the current block 51 in terms of decoding.

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second exemplary embodiment

[0174]Hereinafter, the second exemplary embodiment of the present invention will be described with reference to the drawings.

[0175]In the second exemplary embodiment, the inter prediction using the reconstructed pixel region according to the first exemplary embodiment described above is applied to inter prediction using affine transformation. Specifically, in order to derive a motion vector of a control point used for inter prediction using affine transformation, a motion vector derivation method using the reconstructed pixel region is applied. Hereinafter, for convenience of description, according to the second exemplary embodiment of the present invention, inter prediction using affine transformation is simply referred to as affine inter prediction.

[0176]FIG. 11 is a diagram illustrating affine inter prediction.

[0177]In affine inter prediction, motion vectors at four corners of the current block to be encoded or decoded are obtained, and then the motion vectors are used to generat...

third exemplary embodiment

[0215]FIG. 18 is a diagram illustrating a current block partitioned into multiple regions for inter prediction according to a third exemplary embodiment of the present invention.

[0216]FIG. 18 shows a current block 500 to be encoded or decoded and a pre-reconstructed pixel region C 503 as a region adjacent to the current block 500. The current block 500 is partitioned into region A 500-a and region B 500-b.

[0217]Due to correlation between pixels, the pixels within the reconstructed pixel region C 503 is likely to be similar to the pixels included in the region A 500-a, but is unlikely to be similar to the pixels included in the region B 500-b. Therefore, in inter prediction on the region A 500-a, motion estimation and motion compensation using the reconstructed pixel region C 503 are performed to find accurate motion while preventing increase in overhead. In the meantime, as the inter prediction method for the region B 500-b, the conventional inter prediction may be applied.

[0218]FI...

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Abstract

The present invention relates to an image encoding / decoding method and device. In an image decoding method and device according to an embodiment of the present invention, a reconstructed pixel region within an image to which a current block to be decoded belongs is selected; a motion vector of the reconstructed pixel region is derived on the basis of the reconstructed pixel region and a reference image of the current block; and the derived motion vector is selected as a motion vector of the current block.

Description

TECHNICAL FIELD[0001]The present invention relates to an image signal encoding / decoding method and device. More particularly, the present invention relates to an image encoding / decoding method using inter prediction and an image encoding / decoding device using inter prediction.BACKGROUND ART[0002]Recently, demand for multimedia data such as video has rapidly increased on the Internet. However, the rate at which a bandwidth of a channel has developed is insufficient to keep up with the amount of multimedia data that has rapidly increased. Considering this situation, the Video Coding Expert Group (VCEG) of ITU-T and the Moving Picture Expert Group (MPEG) of ISO / IEC, which are the International Organizations for Standardization, established the High Efficiency Video Coding (HEVC) version 1, a video compression standard, in February 2014.[0003]HEVC uses a variety of technologies such as intra prediction, inter prediction, transform, quantization, entropy encoding, and in-loop filtering. ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N19/159H04N19/176H04N19/52H04N19/124H04N19/44
CPCH04N19/105H04N19/157H04N19/176H04N19/463H04N19/513H04N19/54H04N19/56H04N19/567H04N19/583H04N19/124H04N19/159H04N19/45H04N19/52
Inventor MOON, JOO HEELIM, SUNG WONWON, DONG JAE
Owner IND ACAD COOP GRP OF SEJONG UNIV
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