Unlock instant, AI-driven research and patent intelligence for your innovation.

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

A technology of encoding method and decoding method, which is applied in the field of compressed images or image sequences, and can solve problems such as difficult to simulate

Pending Publication Date: 2021-09-17
ORANGE SA (FR)
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prediction of such pixels using previously processed neighboring pixels as described above makes it difficult to simulate such transitions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Methods and devices for coding and decoding data stream representing at least one image
  • Methods and devices for coding and decoding data stream representing at least one image
  • Methods and devices for coding and decoding data stream representing at least one image

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0093] 5.1 General principles

[0094] The invention improves the coding mode of a block of an image using local prediction of pixels in the block that lie on a transition between two very different pixel value levels.

[0095] The coding mode using local prediction of the block to be coded allows using reference pixels belonging to the block to be coded to predict other pixels of the block to be coded. This prediction mode reduces prediction residuals by using pixels in a block that are spatially very close to the pixels to be coded.

[0096] However, this coding mode introduces relatively large coding residuals when the original pixel is far away from its prediction. This is often the case for content such as screenshots or composited images. In this type of content, the blocks to be encoded may have strong discontinuities. In this case, reference pixels belonging to the background can be used to predict pixels belonging to the foreground in the same block, and vice versa...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for coding and decoding and, correspondingly, a device for coding and decoding a coded data stream representing at least one image that is split into blocks. For at least one current block of the image, a group of pixel values that are constant in the block is determined (E441) from pixels decoded beforehand, and for each pixel of the block, a prediction residual associated with the pixel is decoded (E442). A prediction value associated with the pixel is determined (E4411) by using a first prediction mode in which the pixel is predicted from at least one other pixel decoded beforehand, the other pixel decoded beforehand belonging to said current block, a piece of information (E4422) indicating whether the pixel is to be predicted by using a second prediction mode in which the pixel is predicted by using a prediction resulting from the group of pixel values that are constant in the block. When the pixel is predicted by using the second prediction mode, the prediction value associated with the pixel is replaced (E4423) by a selected value of the group. The pixel is reconstructed (E444) by using the prediction value associated with the pixel and by using the prediction residual.

Description

technical field [0001] The field of the invention is that of encoding and decoding images or image sequences, and 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 is especially applicable to image or video encoding, and corresponding decoding, implemented in current or future encoders (JPEG, MPEG, H.264, HEVC, etc. and modifications thereof). Background technique [0004] Digital images and image sequences take up a lot of space in memory, requiring that these images be compressed when they are transmitted to avoid congestion problems on the network used for the transmission. [0005] Various techniques for compressing video data are known. Among them, the HEVC compression standard ("High Efficiency Video Coding, Coding Tools and Specification", Matthias Wien, Signals and Communication Technology, 2015) proposes to realize that the p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/11H04N19/105H04N19/176H04N19/182H04N19/593H04N19/70
CPCH04N19/105H04N19/11H04N19/119H04N19/176H04N19/182H04N19/593H04N19/70
Inventor F.亨利M.阿布多利
Owner ORANGE SA (FR)