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Spatial error concealment based on the intra-prediction modes transmitted in a coded stream

An internal prediction and mode technology, applied in pulse modulation TV signal transmission, TV signal transmission through single/parallel channel, TV, etc., can solve problems such as low-quality images

Inactive Publication Date: 2006-01-11
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such countermeasures result in low-quality images, with artifacts visible even when displayed at high frame rates

Method used

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  • Spatial error concealment based on the intra-prediction modes transmitted in a coded stream
  • Spatial error concealment based on the intra-prediction modes transmitted in a coded stream
  • Spatial error concealment based on the intra-prediction modes transmitted in a coded stream

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Embodiment Construction

[0027] Block-based video compression techniques, such as those embodied in the proposed ISO / ITU H.264 video compression standard, operate by dividing an image into slices, each slice consisting of a set or pair of macroblocks, according to the standard for each Macroblocks are coded. Typically, a macroblock is defined as a square area of ​​16x16 pixels. For coding purposes, a macroblock can be further divided into sub-macroblocks, which do not have to be square. When encoding a macroblock, each of the sub-macroblocks may have a different encoding mode. For ease of description, a block is referred to as a sub-macroblock of 4×4 pixels. figure 1 The division of the encoded image 100 into macroblocks 110 is shown, wherein each macroblock 110 is divided into blocks 120 and each block is divided into pixels 130 . figure 1 The divided image 100 includes n rows by m columns of macroblocks 110, where n and m are integers. Note that the number of macroblocks within a picture changes...

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Abstract

Spatial concealment of errors in an intra picture comprised of a stream of macroblocks is achieved by predicting the missing data in a macroblock based on an intra prediction mode specified in neighboring block. In practice, when macroblocks within a stream are coded by a block based coding technique, such as coding technique specified in the H.264 ISO / ITU standard, a macroblock can be predicted for coding purpose based on neighboring intra prediction modes specified by the coding technique.

Description

[0001] Related document cross reference [0002] This application claims priority under 35 U.S.C 119(e) to U.S. Provisional Patent Application Serial No. 60 / 439,189, filed January 10, 2003, the technology of which is incorporated herein as a disclosure. technical field [0003] The present invention relates to a technique for correcting errors occurring in coded pictures of a coded video stream. Background technique [0004] In many cases, video streams are compressed (encoded) for ease of storage and transmission. Such encoded video streams often cause data to be lost or become corrupted during transmission due to channel errors and / or network congestion. When decoding, the loss / corruption of data manifests itself as missing pixel values. To reduce such artifacts, the encoder will "conceal" such missing pixel values ​​by estimating values ​​from other macroblocks in the same picture, or from other pictures. The term "hiding" is a slight misnomer, since the encoder doesn'...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/12H04N19/89H04N19/895
CPCH04N7/26026H04N7/26207H04N19/00278H04N19/00763H04N19/00939H04N7/26244H04N19/00042H04N7/34H04N7/68H04N19/00212H04N19/11H04N19/157H04N19/176H04N19/593H04N19/895H04N7/12H04N19/89
Inventor 克里斯蒂娜·戈米纳彭茵
Owner THOMSON LICENSING SA