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Methods and devices for coding and decoding a data stream representing at least one image

A decoding method and data flow technology, applied in the field of video streams, compressed images or image sequences, can solve problems such as the coexistence of DPCM prediction modes that are not described

Pending Publication Date: 2021-04-30
ORANGE SA (FR)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Furthermore, in US9253508, it is not described how to make traditional intra prediction mode and DPCM prediction mode co-exist as defined in the HEVC standard

Method used

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  • Methods and devices for coding and decoding a data stream representing at least one image
  • Methods and devices for coding and decoding a data stream representing at least one image
  • Methods and devices for coding and decoding a data stream representing at least one image

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Embodiment

[0097] figure 1The steps of an encoding method according to a particular embodiment of the invention are shown. For example, according to a particular embodiment of the invention, a sequence I of images 1 , I 2 ,..., I Nb Encoded in the form of an encoded data stream STR. For example, this encoding method is implemented by an encoding device, as referred to later Image 6 mentioned.

[0098] Image Sequence I 1 , I 2 ,..., I Nb (Nb is the number of images of the sequence to be encoded) is provided as input to the encoding method. The encoding method outputs an encoded data stream STR representing the sequence of images provided as input.

[0099] In a known manner, the sequence of images I 1 , I 2 ,..., I Nb The encoding is done picture by picture according to an encoding order pre-established and known by the encoder. For example, in chronological order I 1 , I 2 ,..., I Nb or other sequences (such as I 1 , I 3 , I 2 ,..., I Nb ) to encode the image.

[01...

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Abstract

The invention relates to a method for decoding a stream of encoded data representing at least one image that is split into blocks. For at least one block of the image, called the current block, it is determined whether the size of the current block is less than or equal to a predetermined threshold. If the size of the current block is less than or equal to the predetermined threshold, the method comprises decoding (E42) a piece of information indicating a coding mode of the current block among a first coding mode and a second coding mode, and reconstructing the current block according to the coding mode indicated by said piece of information, and otherwise reconstructing the current block according to the first coding mode. The first coding mode corresponds to a coding mode according to which the current block is reconstructed (E436) using an inverse transformation of a transformed prediction remainder decoded for the current block, and the second coding mode corresponds to a coding mode according to which the current block is reconstructed (E444), for each pixel of the current block, by obtaining a prediction of said pixel based on another previously decoded pixel belonging to the current block or to a previously decoded block of the image, and reconstructing said pixel based on the prediction obtained and on a decoded prediction remainder associated with said pixel.

Description

technical field [0001] The field of the invention is the encoding and decoding of images or sequences of images, in particular video streams. [0002] More specifically, the invention relates to compressing an image or sequence of images using a block representation of the image. [0003] The invention can be applied notably to image or video coding implemented in current or future coders (JPEG, MPEG, H.264, HEVC, etc. and modifications thereof), and to corresponding decoding. Background technique [0004] Digital images and sequences of images are memory-intensive, requiring that these images be compressed when transmitted to avoid congestion problems on the network used for this transmission. [0005] Many techniques are known for compressing video data. Among them, the HEVC compression standard ("High Efficiency Video Coding, Coding Tools and Specification", Matthias Wien, Signals and Communication Technology, 2015) proposes to realize the prediction (intra-frame predic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/176H04N19/593H04N19/11H04N19/182H04N19/34
CPCH04N19/11H04N19/176H04N19/182H04N19/34H04N19/593H04N19/119H04N19/60H04N19/136H04N19/61
Inventor F.亨利M.阿布多利P.菲利普G.克莱尔
Owner ORANGE SA (FR)
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