Source: http://www.google.com/patents/US7916796?dq=6437692
Timestamp: 2015-05-30 20:33:25
Document Index: 530397866

Matched Legal Cases: ['art 10', 'art 10', 'art 10', 'art 10', 'art 10', 'art 10', 'art 10']

Patent US7916796 - Region clustering based error concealment for video data - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn error detection and correction circuit for a video decoder that reconstructs a lost macroblock including a clustering circuit, a classification circuit and an error concealment circuit. The clustering circuit clusters macroblocks adjacent to the lost macroblock into one or more defined clusters. The...http://www.google.com/patents/US7916796?utm_source=gb-gplus-sharePatent US7916796 - Region clustering based error concealment for video dataAdvanced Patent SearchPublication numberUS7916796 B2Publication typeGrantApplication numberUS 11/254,166Publication dateMar 29, 2011Filing dateOct 19, 2005Priority dateOct 19, 2005Fee statusPaidAlso published asUS20070086527Publication number11254166, 254166, US 7916796 B2, US 7916796B2, US-B2-7916796, US7916796 B2, US7916796B2InventorsYong YanOriginal AssigneeFreescale Semiconductor, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (16), Non-Patent Citations (11), Referenced by (4), Classifications (10), Legal Events (7) External Links: USPTO, USPTO Assignment, EspacenetRegion clustering based error concealment for video data
US 7916796 B2Abstract
An error detection and correction circuit for a video decoder that reconstructs a lost macroblock including a clustering circuit, a classification circuit and an error concealment circuit. The clustering circuit clusters macroblocks adjacent to the lost macroblock into one or more defined clusters. The classification circuit assigns the lost macroblock or each sub-block of the lost macroblock to a defined cluster. The error concealment circuit reconstructs attributes of the lost macroblock or its sub-block based on selected attributes of a defined cluster to which the lost block is assigned. Clustering is based on entire adjacent macroblocks or sub-blocks thereof. The clustering circuit may perform clustering using any one or more of the attributes of the macroblocks including coding parameters, texture statistics, color components, frequency analysis, and image processing operators. The lost macroblock may be assigned as a whole or subdivided into lost sub-blocks that are individually assigned to clusters.
The Advanced Video Coding (AVC) standard, Part 10 of MPEG4 (Motion Picture Experts Group), otherwise known as International Telecommunication Union (ITU) H.264, include advanced compression techniques that were developed to enable transmission of video signals at a lower bit rate or storage of video signals using less storage space. The newer standard outperforms video compression techniques of prior standards in order to support higher quality streaming video at lower bit-rates and to enable internet-based video and wireless applications and the like. The standard does not define the CODEC (encoder/decoder pair) but instead defines the syntax of the encoded video bitstream along with a method of decoding the bitstream. Each video frame is subdivided and encoded at the macroblock level, where each macroblock is a 16�16 block of pixels. Each macroblock is encoded in ‘intraframe’ mode in which a prediction macroblock is formed based on reconstructed macroblocks in the current frame, or ‘interframe’ mode in which a prediction macroblock is formed based on previously reconstructed frames. The intraframe coding mode applies spatial information within the current frame in which the prediction macroblock is formed from samples in the current frame that have previously encoded, decoded and reconstructed. The interframe coding mode utilizes temporal information from previous and/or future reference frames to estimate motion to form the prediction macroblock.
After classification is performed, operation proceeds to block 309 in which error concealment is performed on the lost macroblock or each assigned sub-block thereof. The lost macroblock may be “recovered” by averaging the attributes of defined clusters and applying the averaged value to the macroblock or to each sub-block assigned to that cluster. For example, in one embodiment the motion vectors are used for motion compensation (temporal) and/or the texture around the boundaries are applied into final refinements (spatial). Any spatial-temporal error concealment method may be used after the lost macroblock is classified. For example, motion vector interpolations or averaging/median filtering are applied inside a cluster to obtain an estimated motion vector for the lost macroblock or for each sub-block of the lost macroblock. Then, the estimated motion vectors are used to perform motion compensation to restore the lost macroblock. In the embodiment illustrated, the error detection and correction circuit 209 employs the MC circuit 219 for performing motion compensation. If all or most of the macroblocks in the cluster are intraframe encoded, or if they are in an I-frame, such that motion vector information is not available, then spatial interpolation is conducted.
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examinerClassifications U.S. Classification375/240.27, 375/240.24, 375/240.16International ClassificationH04N11/02, H04N7/12, H04N11/04Cooperative ClassificationH04N19/61, H04N19/895European ClassificationH04N7/50, H04N7/68Legal EventsDateCodeEventDescriptionSep 29, 2014FPAYFee paymentYear of fee payment: 4Nov 6, 2013ASAssignmentOwner name: CITIBANK, N.A., AS NOTES COLLATERAL AGENT, NEW YORFree format text: SECURITY AGREEMENT;ASSIGNOR:FREESCALE SEMICONDUCTOR, INC.;REEL/FRAME:031591/0266Effective date: 20131101Jun 18, 2013ASAssignmentOwner name: CITIBANK, N.A., AS NOTES COLLATERAL AGENT, NEW YORFree format text: SECURITY AGREEMENT;ASSIGNOR:FREESCALE SEMICONDUCTOR, INC.;REEL/FRAME:030633/0424Effective date: 20130521May 13, 2010ASAssignmentFree format text: SECURITY AGREEMENT;ASSIGNOR:FREESCALE SEMICONDUCTOR, INC.;US-ASSIGNMENT DATABASE UPDATED:20100525;REEL/FRAME:24397/1Free format text: SECURITY AGREEMENT;ASSIGNOR:FREESCALE SEMICONDUCTOR, INC.;REEL/FRAME:24397/1Owner name: CITIBANK, 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