WO2002065784A1 - Motion information coding and decoding method - Google Patents
Motion information coding and decoding method Download PDFInfo
- Publication number
- WO2002065784A1 WO2002065784A1 PCT/IB2002/000777 IB0200777W WO02065784A1 WO 2002065784 A1 WO2002065784 A1 WO 2002065784A1 IB 0200777 W IB0200777 W IB 0200777W WO 02065784 A1 WO02065784 A1 WO 02065784A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- motion vector
- current
- spatial
- predictor
- block
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
- H04N19/51—Motion estimation or motion compensation
- H04N19/513—Processing of motion vectors
- H04N19/517—Processing of motion vectors by encoding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
- H04N19/51—Motion estimation or motion compensation
Definitions
- the present invention relates to a method of coding motion information associated to a video sequence divided into successive frames, comprising the steps of:
- coding by means of a differential encoding technique, including for each motion vector to be coded a predictor associated to it, the motion information constituted by said associated motion vector field.
- the invention also relates to a corresponding encoding device, to a method of decoding motion information coded according to this coding method, and to a corresponding decoding device.
- the bidimensional blocks are for instance macroblocks, as defined in the standards of the MPEG family.
- the coding schemes proposed for digital video compression generally use motion estimation and compensation for reducing the temporal redundancy between the successives frames of the processed video sequence.
- a set of motion vectors is determined at the encoding side and transmitted to the decoder.
- Most video coding standards use for the motion estimation operation the so-called block matching algorithm (BMA), described for example in the document "MPEG video coding : a basic tutorial introduction", S.R. Ely, BBC Research and Development Report, 1996.
- BMA block matching algorithm
- Said algorithm depicted in Fig.l, tries to find for each block B c of a current image I t the block B r of a previous reference image I t-1 that best matches, said previous block being only searched in a limited area of this previous image (or search window SW) around the position of the bloc B c .
- the set of motion vectors thus determined in the encoder for each block B c of the current frame must be sent to the decoder.
- these vectors are generally differentially encoded with reference to previously determined motion vectors (or predictors). More precisely, the encoding of the motion vectors describing the motion from previous blocks B r to current ones Be is realized by means of a predictive technique based on previously transmitted spatial neighbours. The motion vectors are differenced with respect to a prediction value and coded using variable length codes.
- the invention relates to a coding method such as defined in the introductory part of the description and which is moreover characterized in that, for each current block, the predictor used in the subtraction operation of said differential encoding technique is a spatio-temporal predictor P obtained by means of a linear combination defined by a relation of the type:
- the criterion for the choice of the weighting coefficients is to minimize the distortion between the motion vector C to be coded and its predictor P in the least means square sense, i.e. to minimize the following operator:
- the spatial predictor is obtained by applying a median filtering on a set of motion vector candidates chosen in the neighbourhood of the current block, said set of motion vector candidates comprising three motion vector candidates if a spatial prediction compliant with the MPEG-4 standard is required.
- the temporal predictor may be determined either by re-using the spatial predictor already determined for the motion vector of the current block to point to the block inside the previously transmitted motion vector field, or by keeping in memory the spatial predictor candidates used during the computation of the spatial predictor, pointing with them from the corresponding blocks in the current image to blocks of the previous image whose motion vectors may be viewed also as spatial predictors for the temporal predictor to be determined, and implementing a median filtering of these spatial predictors inside the previous motion vector field, the obtained result being said temporal predictor to be determined.
- the invention relates to a method of decoding motion information corresponding to an image sequence and which has been previously, before a transmission and/or storage step, coded by means of a coding method comprising the steps of:
- a first type of decoding step only based on spatial predictors
- a second type of decoding step comprising a computation of the spatio-temporal predictor P on the basis of the motion vectors of the previous motion vector field already decoded, spatial predictors defined in the neighbourhood of the current motion vector to be decoded, and the transmitted weighting coefficients a and ⁇ .
- Fig. 1 illustrates the classical block matching algorithm
- Fig. 2 shows the locations of the predictors used in a known three-dimensional (3D) motion estimation method
- Fig. 3 shows the possible locations of spatial candidates for motion vector encoding by means of a predictive technique
- Fig. 4 illustrates a first solution for the determination of a motion vector temporal predictor
- Fig. 5 illustrates a second solution for such a determination
- Fig. 6 illustrates an implementation of an encoder allowing to carry out the encoding method according to the invention
- Fig. 7 illustrates an implementation of a decoder allowing to carry out the decoding method according to the invention.
- the motion estimation is based on a search scheme which tries to find the best matching position of a block within a limited search area SW in the previous frame, said matching position being described for each block (or "macroblock", in the case of the MPEG standards) by a motion vector which is, after subtraction of the predictor and variable length encoding (NLC), transmitted from the encoder to the decoder.
- NLC variable length encoding
- the principle of the invention is to introduce in the prediction (provided before the variable length coding (VLC) of the differential values corresponding to each current motion vector) an additional operation taking into account the temporal correlation observed between two successive motion vector fields.
- VLC variable length coding
- a block-based motion estimation using temporal predictors is already described for instance in "True motion estimation with 3D recursive block matching", by G. de Haan and al, IEEE Transactions on Circuits and
- a first solution for determining, for the current motion vector field CMNF, an appropriate temporal predictor P may be to re-use the spatial predictor already determined for the motion vector of the current macroblock to point to the macroblock inside the previously transmitted motion vector field PMNF.
- a median filtering operation may be, once more, carried out on a neighbourhood of eight macroblocks around the selected macroblock.
- a second solution for the determination of the predictor P is, as illustrated in Fig.5, to keep in memory the spatial predictor candidates SPC used during the computation of the spatial predictor.
- These motion vector candidates point from macroblocks in the current frame to macroblocks of the previous frame whose motion vectors may be viewed also as spatial predictors for the temporal predictor that has to be determined.
- This temporal predictor for the current motion vector is then the result of a median filtering of these spatial predictors inside the previous motion vector field.
- the predictor P which may be called spatial- temporal, is obtained by means of a linear combination of the following type:
- the motion vectors are generally encoded with a DPCM (Differential Pulse Code Modulation) technique, in which only the differences between the input and a prediction based on a previous output locally decoded are quantized and transmitted, followed by an entropy coding step using NLC tables and generating the coded data corresponding to the motion vectors).
- DPCM Different Pulse Code Modulation
- NLC tables NLC tables
- Fig.6 gives a illustration of such an encoder : the input video information NIF is split into video objects (VOs) by means of a segmentation circuit 61, a coding control circuit 62 decides (for instance on the basis of requirements of the user, or of the capabilities of the decoder) which VOs are to be transmitted, the selected VOs are then encoded (each one independently of the others) in coding circuits 63a to 63n, and a multiplexer 64 merges the n bitstreams thus obtained (and representing the different VOs) into a single video bitstream.
- VOs video objects
- a coding control circuit 62 decides (for instance on the basis of requirements of the user, or of the capabilities of the decoder) which VOs are to be transmitted, the selected VOs are then encoded (each one independently of the others) in coding circuits 63a to 63n, and a multiplexer 64 merges the n bitstreams thus obtained (and representing the different VOs)
- each VO being defined by its shape, texture and motion components, the encoding mechanism of each coding circuit must perform shape, texture and motion encoding operations.
- the shape and texture operations are performed as described for instance in "MPEG-4 natural video coding - An overview", T.Ebrahimi and al., Signal Processing : Image Communication, vol.15, n°4-5, January 2000, pp.365-385.
- the motion operation can be performed according to the invention, i.e. by implementing the motion information coding method described above.
- Fig.7 gives an illustration of a decoder allowing to receive and decode a coded bitstream such as the one obtained when performing said encoding method : the input bitstream is first demultiplexed in a demultiplexing circuit 71, the demultiplexed elementary streams thus generated, corresponding to the different VOs, are parsed and passed to appropriate decoders (shape decoding circuit 72, texture decoding circuit 73, motion decoding circuit 74), and a reconstruction circuit 75, using the decoded data along with scene description information to re-compose the original scene including the VOs, allows to finally obtain a displayed video image.
- the motion information decoding method according to the invention is performed in said circuit 74.
- the devices described herein can be implemented in hardware, software, or a combination of hardware and software, without excluding that a single item of hardware or software can carry out several functions or that an assembly of items of hardware and software or both carry out a single function.
- the described methods and devices may be implemented by any type of computer system or other apparatus adapted for carrying out the methods described herein.
- a typical combination of hardware and software could be a general-purpose computer system with a computer program that, when loaded and executed, controls the computer system such that it carries out the methods described herein.
- a specific use computer, containing specialized hardware for carrying out one or more of the functional tasks of the invention could be utilized.
- the present invention can also be embedded in a computer program product, which comprises all the features enabling the implementation of the methods and functions described herein, and which -when loaded in a computer system- is able to carry out these methods and functions.
- Computer program, software program, program, program product, or software in the present context mean any expression, in any language, code or notation, of a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following:
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/240,914 US6825885B2 (en) | 2001-02-13 | 2002-02-11 | Motion information coding and decoding method |
DE60204447T DE60204447T2 (en) | 2001-02-13 | 2002-02-11 | METHOD OF CODING AND DECODING MOTOR ESTIMATION |
JP2002565365A JP2004519167A (en) | 2001-02-13 | 2002-02-11 | Method for encoding and decoding motion information |
AT02703807T ATE297099T1 (en) | 2001-02-13 | 2002-02-11 | METHOD FOR CODING AND DECODING MOTION ESTIMATES |
EP02703807A EP1378124B1 (en) | 2001-02-13 | 2002-02-11 | Motion information coding and decoding method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01400375 | 2001-02-13 | ||
EP01400375.0 | 2001-02-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002065784A1 true WO2002065784A1 (en) | 2002-08-22 |
Family
ID=8182624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2002/000777 WO2002065784A1 (en) | 2001-02-13 | 2002-02-11 | Motion information coding and decoding method |
Country Status (8)
Country | Link |
---|---|
US (1) | US6825885B2 (en) |
EP (1) | EP1378124B1 (en) |
JP (1) | JP2004519167A (en) |
KR (1) | KR100887524B1 (en) |
CN (1) | CN1248509C (en) |
AT (1) | ATE297099T1 (en) |
DE (1) | DE60204447T2 (en) |
WO (1) | WO2002065784A1 (en) |
Families Citing this family (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4130783B2 (en) * | 2002-04-23 | 2008-08-06 | 松下電器産業株式会社 | Motion vector encoding method and motion vector decoding method |
EP1418762A1 (en) * | 2002-05-22 | 2004-05-12 | Matsushita Electric Industrial Co., Ltd. | Moving image encoding method, moving image decoding method, and data recording medium |
US7499495B2 (en) * | 2003-07-18 | 2009-03-03 | Microsoft Corporation | Extended range motion vectors |
US20050013498A1 (en) | 2003-07-18 | 2005-01-20 | Microsoft Corporation | Coding of motion vector information |
US8064520B2 (en) * | 2003-09-07 | 2011-11-22 | Microsoft Corporation | Advanced bi-directional predictive coding of interlaced video |
US7599438B2 (en) * | 2003-09-07 | 2009-10-06 | Microsoft Corporation | Motion vector block pattern coding and decoding |
US7620106B2 (en) * | 2003-09-07 | 2009-11-17 | Microsoft Corporation | Joint coding and decoding of a reference field selection and differential motion vector information |
US7724827B2 (en) * | 2003-09-07 | 2010-05-25 | Microsoft Corporation | Multi-layer run level encoding and decoding |
US7567617B2 (en) * | 2003-09-07 | 2009-07-28 | Microsoft Corporation | Predicting motion vectors for fields of forward-predicted interlaced video frames |
US7623574B2 (en) * | 2003-09-07 | 2009-11-24 | Microsoft Corporation | Selecting between dominant and non-dominant motion vector predictor polarities |
US7616692B2 (en) * | 2003-09-07 | 2009-11-10 | Microsoft Corporation | Hybrid motion vector prediction for interlaced forward-predicted fields |
CN1306821C (en) * | 2004-07-30 | 2007-03-21 | 联合信源数字音视频技术(北京)有限公司 | Method and its device for forming moving vector prediction in video image |
US8588304B2 (en) | 2005-03-31 | 2013-11-19 | Panasonic Corporation | Video decoding device, video decoding method, video decoding program, and video decoding integrated circuit |
US8457203B2 (en) * | 2005-05-26 | 2013-06-04 | Ntt Docomo, Inc. | Method and apparatus for coding motion and prediction weighting parameters |
BRPI0613659B1 (en) * | 2005-07-21 | 2019-06-04 | Thomson Licensing | METHOD AND APPARATUS FOR WEIGHTED PROGNOSIS FOR A REDIMENSIONABLE VIDEO CODIFICATION |
JP5275806B2 (en) * | 2005-10-12 | 2013-08-28 | トムソン ライセンシング | Weighted prediction method and apparatus in scalable video encoding and decoding |
DE102005051091A1 (en) * | 2005-10-25 | 2007-04-26 | Siemens Ag | Methods and apparatus for determining and reconstructing a predicted image area |
EP1982530A2 (en) * | 2006-02-06 | 2008-10-22 | Thomson Licensing | Method and apparatus for reusing available motion information as a motion estimation predictor for videoencoding |
CN101491107B (en) * | 2006-07-07 | 2012-07-18 | 艾利森电话股份有限公司 | Method for decoding image element group, related encoder and decoder |
KR101383540B1 (en) | 2007-01-03 | 2014-04-09 | 삼성전자주식회사 | Method of estimating motion vector using multiple motion vector predictors, apparatus, encoder, decoder and decoding method |
EP2104356A1 (en) * | 2008-03-18 | 2009-09-23 | Deutsche Thomson OHG | Method and device for generating an image data stream, method and device for reconstructing a current image from an image data stream, image data stream and storage medium carrying an image data stream |
KR101361005B1 (en) * | 2008-06-24 | 2014-02-13 | 에스케이 텔레콤주식회사 | Intra Prediction Method and Apparatus and Image Encoding/Decoding Method and Apparatus Using Same |
US8290712B2 (en) * | 2008-11-14 | 2012-10-16 | The Invention Science Fund I, Llc | Food content detector |
WO2011048903A1 (en) * | 2009-10-20 | 2011-04-28 | シャープ株式会社 | Video encoding device, video decoding device, and data structure |
KR20120016991A (en) * | 2010-08-17 | 2012-02-27 | 오수미 | Inter prediction process |
KR101341993B1 (en) * | 2010-10-06 | 2013-12-16 | 에스케이텔레콤 주식회사 | Method and Apparatus for Image Encoding/Decoding Using High Resolution Filter |
RU2010144450A (en) | 2010-10-29 | 2012-05-10 | ЭлЭсАй Корпорейшн (US) | ASSESSING MOTION FOR A VIDEO TRANSCODER |
GB2488815C (en) * | 2011-03-09 | 2018-03-28 | Canon Kk | Video decoding |
CN103733625B (en) * | 2011-06-14 | 2017-04-05 | 三星电子株式会社 | For the method decoded to motion vector |
US8483516B2 (en) * | 2011-08-16 | 2013-07-09 | National Taiwan University | Super resolution system and method with database-free texture synthesis |
PL409214A1 (en) * | 2011-11-08 | 2015-07-20 | Kt Corporation | Method and the device for scanning coefficients on the basis of the prediction unit division mode |
CN103248894B (en) * | 2013-05-14 | 2016-09-14 | 讯美电子科技有限公司 | A kind of multi-channel code method and system |
JP6640468B2 (en) | 2015-04-22 | 2020-02-05 | Necディスプレイソリューションズ株式会社 | Display system, display device, and adjustment method |
US10445862B1 (en) * | 2016-01-25 | 2019-10-15 | National Technology & Engineering Solutions Of Sandia, Llc | Efficient track-before detect algorithm with minimal prior knowledge |
US11665365B2 (en) * | 2018-09-14 | 2023-05-30 | Google Llc | Motion prediction coding with coframe motion vectors |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0415491A1 (en) * | 1989-08-29 | 1991-03-06 | Koninklijke Philips Electronics N.V. | Motion estimation |
US5301019A (en) * | 1992-09-17 | 1994-04-05 | Zenith Electronics Corp. | Data compression system having perceptually weighted motion vectors |
US5574663A (en) * | 1995-07-24 | 1996-11-12 | Motorola, Inc. | Method and apparatus for regenerating a dense motion vector field |
WO1997046022A2 (en) * | 1996-05-24 | 1997-12-04 | Philips Electronics N.V. | Motion estimation |
EP0886445A2 (en) * | 1997-06-18 | 1998-12-23 | Nds Limited | Motion estimation method |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0111510B1 (en) * | 1982-06-22 | 1988-02-03 | Hughes Aircraft Company | Low temperature process for depositing epitaxial layers |
-
2002
- 2002-02-11 AT AT02703807T patent/ATE297099T1/en not_active IP Right Cessation
- 2002-02-11 KR KR1020027013631A patent/KR100887524B1/en not_active IP Right Cessation
- 2002-02-11 WO PCT/IB2002/000777 patent/WO2002065784A1/en active IP Right Grant
- 2002-02-11 US US10/240,914 patent/US6825885B2/en not_active Expired - Fee Related
- 2002-02-11 CN CNB02800289XA patent/CN1248509C/en not_active Expired - Fee Related
- 2002-02-11 JP JP2002565365A patent/JP2004519167A/en active Pending
- 2002-02-11 EP EP02703807A patent/EP1378124B1/en not_active Expired - Lifetime
- 2002-02-11 DE DE60204447T patent/DE60204447T2/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0415491A1 (en) * | 1989-08-29 | 1991-03-06 | Koninklijke Philips Electronics N.V. | Motion estimation |
US5301019A (en) * | 1992-09-17 | 1994-04-05 | Zenith Electronics Corp. | Data compression system having perceptually weighted motion vectors |
US5574663A (en) * | 1995-07-24 | 1996-11-12 | Motorola, Inc. | Method and apparatus for regenerating a dense motion vector field |
WO1997046022A2 (en) * | 1996-05-24 | 1997-12-04 | Philips Electronics N.V. | Motion estimation |
EP0886445A2 (en) * | 1997-06-18 | 1998-12-23 | Nds Limited | Motion estimation method |
Non-Patent Citations (2)
Title |
---|
HAAN DE G ET AL: "TRUE-MOTION ESTIMATION WITH 3-D RECURSIVE SEARCH BLOCK MATCHING", IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, IEEE INC. NEW YORK, US, vol. 3, no. 5, 1 October 1993 (1993-10-01), pages 368 - 379, XP000414663, ISSN: 1051-8215 * |
KIM D-W ET AL: "Adaptive motion estimation based on spatio-temporal correlation", SIGNAL PROCESSING. IMAGE COMMUNICATION, ELSEVIER SCIENCE PUBLISHERS, AMSTERDAM, NL, vol. 13, no. 2, 1 August 1998 (1998-08-01), pages 161 - 170, XP004129635, ISSN: 0923-5965 * |
Also Published As
Publication number | Publication date |
---|---|
KR20020093032A (en) | 2002-12-12 |
EP1378124A1 (en) | 2004-01-07 |
ATE297099T1 (en) | 2005-06-15 |
US6825885B2 (en) | 2004-11-30 |
EP1378124B1 (en) | 2005-06-01 |
JP2004519167A (en) | 2004-06-24 |
KR100887524B1 (en) | 2009-03-09 |
DE60204447T2 (en) | 2006-04-27 |
DE60204447D1 (en) | 2005-07-07 |
CN1248509C (en) | 2006-03-29 |
US20030076883A1 (en) | 2003-04-24 |
CN1457604A (en) | 2003-11-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6825885B2 (en) | Motion information coding and decoding method | |
US11438575B2 (en) | Bi-prediction coding method and apparatus, bi-prediction decoding method and apparatus, and recording medium | |
CA2142150C (en) | Motion compensation for interlaced digital video signals | |
US6807231B1 (en) | Multi-hypothesis motion-compensated video image predictor | |
US6483874B1 (en) | Efficient motion estimation for an arbitrarily-shaped object | |
US5886743A (en) | Object-by information coding apparatus and method thereof for MPEG-4 picture instrument | |
EP1404135B1 (en) | A motion estimation method and a system for a video coder | |
EP0762776B1 (en) | A method and apparatus for compressing video information using motion dependent prediction | |
EP1059812A2 (en) | Methods and apparatus for context-based inter/intra coding mode selection | |
US7088772B2 (en) | Method and apparatus for updating motion vector memories | |
US6674910B1 (en) | Apparatus and method for image-compression encoding and decoding using adaptive transform | |
GB2328337A (en) | Encoding motion vectors | |
US20240098251A1 (en) | Bi-prediction coding method and apparatus, bi-prediction decoding method and apparatus, and recording medium | |
US5790207A (en) | Motion compensation method for use in an image encoding system | |
JP2004511978A (en) | Motion vector compression | |
KR19990027484A (en) | Motion vector coding method and device therefor | |
WO2004010708A1 (en) | Advanced method of coding and decoding motion vector and apparatus therefor | |
KR100657714B1 (en) | Method for coding image data using of 3d scanning | |
KR100207397B1 (en) | Method and apparatus for estimating motion of image in image encoder | |
KR100393987B1 (en) | Method of video coding and decoding for video codec | |
JPH06284415A (en) | Motion compensation prediction coding and decoding | |
Dhara et al. | A video coding technique with BTC-PF method for fast decoding | |
KR19990058929A (en) | Motion vector coding method | |
GB2368220A (en) | Compression of motion vectors |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CN JP KR US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2002703807 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10240914 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020027013631 Country of ref document: KR Ref document number: 02800289X Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWP | Wipo information: published in national office |
Ref document number: 1020027013631 Country of ref document: KR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2002565365 Country of ref document: JP |
|
WWP | Wipo information: published in national office |
Ref document number: 2002703807 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 2002703807 Country of ref document: EP |