EP1535472A1 - Procede de compression de donnees numeriques d une sequence video comportant des plans alternes - Google Patents
Procede de compression de donnees numeriques d une sequence video comportant des plans alternesInfo
- Publication number
- EP1535472A1 EP1535472A1 EP03766406A EP03766406A EP1535472A1 EP 1535472 A1 EP1535472 A1 EP 1535472A1 EP 03766406 A EP03766406 A EP 03766406A EP 03766406 A EP03766406 A EP 03766406A EP 1535472 A1 EP1535472 A1 EP 1535472A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sprite
- coding
- large sprite
- sequence
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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
- H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
-
- 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
- H04N19/20—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video object coding
-
- 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
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/142—Detection of scene cut or scene change
-
- 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
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/146—Data rate or code amount at the encoder output
- H04N19/147—Data rate or code amount at the encoder output according to rate distortion criteria
-
- 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
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/172—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a picture, frame or field
-
- 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
- H04N19/20—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video object coding
- H04N19/23—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video object coding with coding of regions that are present throughout a whole video segment, e.g. sprites, background or mosaic
-
- 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
- H04N19/597—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding specially adapted for multi-view video sequence 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
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
- H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
Definitions
- the invention relates to a method for compressing digital data of a video sequence composed of alternating planes, from
- VOP Video Object Plane
- It is a video object (VOP, acronym for English Video Object Plane), generally larger than the displayed video, and persistent over time. It is used to represent more or less static areas, such as backgrounds. It is coded from a breakdown by macroblocks.
- the invention relates in particular to video sequences comprising a succession of shots generated alternately from similar points of view.
- it could be an interview sequence, in which the interviewer and the interviewee are seen alternately, each on a different but largely static background.
- This alternation is not limited to two different points of view.
- the sequence can be made up of N planes, coming from Q different points of view.
- Codings of the conventional type do not take this type of sequence into account and the cost of coding or the compression rate is therefore equivalent to that of other sequences.
- the classic approach consists in effect, at the start of each shot, of coding an image in intra mode, which is followed by images in predictive mode. If a plane from a first point of view appears for the first time, followed by a plane from another point of view, followed by a plane from the first point of view, the first image of this plane is coded entirely in intra mode even if a large part, consisting of the background of the filmed scene, is similar to the images in the foreground. This induces a significant coding cost.
- a known solution to this problem of re-encoding a background already appeared previously consists in memorizing, at each detection of change of plane, the last image of a plane. At the start of a new shot, the first image is coded by temporal prediction having for reference, among the stored images, the one which most resembles it and which therefore corresponds to the same point of view.
- Such a solution can be considered as being directly inspired by a tool known under the English name of "multi-frame referencing", available for example in the MPEG-4 part 10 standard under development. Such a solution is however memory consuming, difficult to implement and costly.
- the invention aims to overcome the aforementioned drawbacks. It relates to a method for compressing digital data from a video sequence, characterized in that it comprises the following steps:
- the sprites are placed one under the other to build the large sprite.
- the positioning of the sprites is calculated as a function of the cost of coding the large sprite.
- the coding used is for example MPEG-4 coding, the large sprite then being coded in accordance with the sprites defined in the MPEG-4 standard.
- the method performs a multiplexing operation (8) of the data relating to the foreground objects extracted and of the data relating to the large sprite to provide a data stream.
- the invention also relates to the compressed data stream for coding a sequence of images according to the method described above, characterized in that it comprises coding data of the large sprite associated with deformation parameters applicable to the large sprite and coding data of the foreground objects extracted.
- the invention also relates to an encoder for encoding data according to the method described above, characterized in that it comprises a processing circuit for the classification of the sequence into planes, the construction of a sprite for each class and the composition of '' a large sprite by concatenating these sprites, a circuit for extracting foreground objects of sequence images relating to the large sprite and a coding circuit for coding the large sprite and objects from before -plan extracts.
- the invention also relates to a decoder for decoding video data of a video sequence comprising alternating planes according to the method described above, characterized in that it comprises a circuit for decoding data relating to a large sprite and relative data to foreground objects and a circuit for constructing images from the decoded data.
- the sprite is used to describe the background of all the video clips from the same point of view. This sprite is coded only once.
- the process consists in coding the deformation parameters to be applied to the sprite to reconstruct what is perceived from the background in the image.
- Foreground objects are coded as non-rectangular video objects or VOPs (Video Object Plan).
- VOPs Video Object Plan
- these VOPs are composed with the background image to obtain the final image.
- a particular implementation of the invention consists in concatenating these different sprites into a single large sprite which then summarizes the different backgrounds of the complete video sequence. Thanks to the invention, the re-encoding of the background, with each reappearance of this background, is avoided. The cost of compressing this type of video sequence is reduced compared to a conventional coding scheme of the MPEG-2 or H.263 type.
- FIG. 1 a flow diagram of a coding method according to the invention
- FIG. 3 blocks of a sprite at the top and bottom edge of a large sprite
- FIG. 1 represents a simplified flowchart of a coding method according to the invention. This process is split into two main phases: an analysis phase and a coding phase.
- the analysis phase includes a first step 1 which is a step of segmenting the video sequence into shots.
- a second step 2 performs a classification of the plans according to the point of view from which they come.
- a class is defined as a subset of plans from the same point of view.
- the third step builds a sprite "summarizing" the background visible in the plans of the subset, this for each of the subsets. For each image of each plane of the subset, deformation parameters, making it possible to reconstruct from the sprite what is perceived from the background, are also calculated.
- An image segmentation step 4 performs segmentation for each image of the different planes, segmentation in order to distinguish the background from the foreground. This step extracts foreground objects from each image.
- Step 5 is carried out in parallel with step 4 and therefore follows step 3. It consists of a concatenation of the different sprites into a single large sprite, with updating of the deformation parameters taking into account the position of each sprite in the big sprite.
- the coding phase follows the analysis phase. Steps
- step 6 and 7 respectively follow steps 4 and 5 and respectively generate a video binary train coding the foreground and a video binary train coding the large sprite. These bit streams are then multiplexed in step 8 to provide the video coding stream.
- Step 1 of segmentation into shots performs a cutting of the sequence into video shots by comparing the successive images, for example by exploiting an algorithm for detecting change of shots.
- Classification step 2 compares the different plans obtained, from their content, and groups together in the same class similar plans, that is to say from an identical or close point of view.
- Step 4 extracts the foreground objects. Successive bit masks are calculated distinguishing, for each image of the video sequence, the background from the foreground. At the end of this step 4, there is therefore, for each plane, a succession of masks, binary or not, indicating the parts of the foreground and the background. In the case of non-binary processing, the mask in fact corresponds to a transparency card.
- the concatenation of the sprites into a large sprite carried out in step 5 can be carried out so as to minimize the cost of coding this large sprite as proposed below.
- the coding information is, inter alia, texture information and deformation information. This last information is for example the successive deformation parameters which are applicable on the large sprite, as a function of time, and which are updated during the generation of the large sprite. It is indeed these transformation parameters which, applied to the large sprite, will make it possible to build and update the funds necessary for the different plans.
- This coding information is transmitted in step 7 to allow the generation of the large sprite binary train.
- step 8 In our realization, two binary trains are generated, one coding the large sprite and the other coding all the objects in the foreground grouped into a single object. These bit streams are then multiplexed in step 8.
- an elementary stream is generated per object. It is therefore also possible to transmit several elementary streams or not to carry out multiplexing with the stream relating to the large sprite for the transmission of the coded data.
- step 4 of object extraction is actually very correlated to the previous step of building a sprite, so it can be performed simultaneously, or even previously, with the previous one.
- the operations in steps 5 and 7 which are described in parallel with the operations in steps 4 and 6, can be carried out successively or prior to these steps 4 and 6.
- certain analysis steps for example that of Extraction of objects can be avoided if there is a description of MPEG-7 type content of the video document to be encoded.
- concatenation can be done by seeking to minimize the cost of coding the large sprite. This can relate to three points: texture, shape, if it exists, successive deformation parameters.
- the predominant criterion is the cost of coding the texture. A method of minimizing this cost is given below in an embodiment exploiting the MPEG-4 standard and performing a sprite assembly in a simple manner, that is to say by superimposing them horizontally, a method which is based on the operation of the MPEG-4 DC / AC spatial prediction tool.
- the spatial prediction is done horizontally or vertically. It systematically relates to the first DCT coefficient of each block ("DC prediction" mode in English in the standard) and can also, optionally, relate to the other DCT coefficients of the first row or first column of each block ( "AC prediction" mode). It is a question of determining the optimal position of concatenation, ie of seeking the minimum cost of coding of the texture by an assembly of neighboring sprites having on their mutual edges a texture continuity.
- FIG. 2 represents a large sprite 9 and a second large sprite 10 to be integrated in order to obtain the new large sprite, that is to say to be positioned relative to sprite 9.
- FIG. 3 represents the sprite 10 of rectangular shape and more particularly the succession of macroblocks 11 at the top edge and the succession of macroblocks 12 at the bottom edge of the sprite.
- the macroblocks of the sprites taken into account are the non-empty macroblocks adjacent to the top border when the sprite is placed under the large sprite and then to the bottom border when the sprite is placed above the large sprite.
- the sprite is not rectangular, only the non-empty macroblocks at the top and bottom border of the rectangle encompassing this sprite are taken into account. Empty macroblocks are ignored.
- a discrete DCT cosine transformation is carried out on the macroblocks taken into account (or luminance blocks of the macroblocks), that is to say the macroblocks or non-empty blocks at the top and bottom edge of the various sprites.
- the optimal high and low positions are then calculated by minimizing a criterion of texture continuity at the border of the two sprites.
- a measure of a global criterion C (X, Y) is calculated.
- the positions (X, Y) are for example the coordinates of the lower left corner of the upper sprite to be integrated or the coordinates of the upper left corner of the lower sprite to be integrated, the origin being defined from a predetermined point of the large sprite.
- the coordinates (X, Y) are limited insofar as the sprite is not allowed to extend beyond the large sprite.
- FIG. 4 represents a current block and the surrounding blocks, block A to its left, block B above A and block C above the current block.
- the gradients of the DC coefficients are determined between blocks A and B,] DC A -DCB I, and between blocks C and B, I DC C -DC B I. If there is no neighboring block A, B or C, the coefficient DC is taken by default equal to 1024.
- ⁇ ACj corresponding to the residue i.e. the difference between the 7 AC coefficients of the first row or first column of the current block and the 7 AC coefficients of the first row or column respectively of the upper block or the block to the left of the block current.
- the optimal position (X op t . Yopt) is the one that minimizes C (X, Y) over all of the positions tested.
- the new deformation parameters are inserted in the list of deformation parameters of the large sprite, at the point where temporally the corresponding plane is inserted in the video sequence.
- Coding can be carried out by carrying out a pre-analysis pass of the video sequence followed by a coding pass based on this analysis.
- coding consists in generating a binary train using the sprite coding tool (cf. part 7.8 of the document ISO / lEC JTC 1 / SC 29 / WG 11 N 2502, p. 189 to 195).
- the second binary train is based on the tools for coding non-rectangular objects, in particular the tool for coding the binary form (cf. part 7.5 of the document ISO / lEC JTC 1 / SC 29 / WG 11 N 2502, p .147 to 158), and possibly in addition the transparency coding tool (“gray shape” in English, see section 7.5.4 of document ISO / IEC JTC 1 / SC 29 / WG 11 N 2502, p.
- the invention also relates to the compressed data streams resulting from the coding of a sequence of images according to the method described above.
- This stream comprises coding data of the large sprite associated with deformation parameters applicable to the large sprite and coding data of the objects of the foregrounds for the reconstruction of the scenes.
- the invention also relates to coders and decoders using such a method. It is for example an encoder comprising a processing circuit for the classification of the sequence in planes, the construction of a sprite for each class and the composition of a large sprite by concatenation of these sprites. It is also a decoder comprising a circuit for constructing images of alternating shots of a video sequence from the decoding of large sprites and foreground objects.
- the applications of the invention relate to the transmission and storage of digital images using video coding standards with exploitation of sprites, in particular the MPEG4 standard.
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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0209639A FR2843252A1 (fr) | 2002-07-30 | 2002-07-30 | Procede de compression de donnees numeriques d'une sequence video comportant des plans alternes |
FR0209639 | 2002-07-30 | ||
PCT/EP2003/050331 WO2004014081A1 (fr) | 2002-07-30 | 2003-07-23 | Procede de compression de donnees numeriques d'une sequence video comportant des plans alternes |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1535472A1 true EP1535472A1 (fr) | 2005-06-01 |
Family
ID=30129520
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03766406A Ceased EP1535472A1 (fr) | 2002-07-30 | 2003-07-23 | Procede de compression de donnees numeriques d une sequence video comportant des plans alternes |
Country Status (9)
Country | Link |
---|---|
US (1) | US20060093030A1 (fr) |
EP (1) | EP1535472A1 (fr) |
JP (1) | JP4729304B2 (fr) |
KR (1) | KR20050030641A (fr) |
CN (1) | CN100499811C (fr) |
AU (1) | AU2003262536A1 (fr) |
FR (1) | FR2843252A1 (fr) |
MX (1) | MXPA05001204A (fr) |
WO (1) | WO2004014081A1 (fr) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100647957B1 (ko) * | 2004-12-14 | 2006-11-23 | 엘지전자 주식회사 | 사전 기반 압축 방법을 이용한 연속된 이미지 압축 및복원 방법 |
US8346784B1 (en) | 2012-05-29 | 2013-01-01 | Limelight Networks, Inc. | Java script reductor |
US9058402B2 (en) | 2012-05-29 | 2015-06-16 | Limelight Networks, Inc. | Chronological-progression access prioritization |
US20110029899A1 (en) | 2009-08-03 | 2011-02-03 | FasterWeb, Ltd. | Systems and Methods for Acceleration and Optimization of Web Pages Access by Changing the Order of Resource Loading |
US8495171B1 (en) | 2012-05-29 | 2013-07-23 | Limelight Networks, Inc. | Indiscriminate virtual containers for prioritized content-object distribution |
US9015348B2 (en) | 2013-07-19 | 2015-04-21 | Limelight Networks, Inc. | Dynamically selecting between acceleration techniques based on content request attributes |
EP3016066A1 (fr) | 2014-10-30 | 2016-05-04 | Thomson Licensing | Procédé de traitement d'une séquence vidéo, dispositif correspondant, programme informatique et support lisible par ordinateur non transitoire |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998029834A1 (fr) * | 1996-12-30 | 1998-07-09 | Sharp Kabushiki Kaisha | Systeme de codage video oriente images-objets |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6075905A (en) * | 1996-07-17 | 2000-06-13 | Sarnoff Corporation | Method and apparatus for mosaic image construction |
EP1042918A1 (fr) * | 1998-08-05 | 2000-10-11 | Koninklijke Philips Electronics N.V. | Procede et dispositif de generation d'image statique |
JP4272771B2 (ja) * | 1998-10-09 | 2009-06-03 | キヤノン株式会社 | 画像処理装置、画像処理方法及びコンピュータ読み取り可能な記憶媒体 |
JP4224748B2 (ja) * | 1999-09-13 | 2009-02-18 | ソニー株式会社 | 画像符号化装置および画像符号化方法、画像復号装置および画像復号方法、記録媒体、並びに画像処理装置 |
US6738424B1 (en) * | 1999-12-27 | 2004-05-18 | Objectvideo, Inc. | Scene model generation from video for use in video processing |
-
2002
- 2002-07-30 FR FR0209639A patent/FR2843252A1/fr active Pending
-
2003
- 2003-07-23 JP JP2004525425A patent/JP4729304B2/ja not_active Expired - Fee Related
- 2003-07-23 MX MXPA05001204A patent/MXPA05001204A/es unknown
- 2003-07-23 AU AU2003262536A patent/AU2003262536A1/en not_active Abandoned
- 2003-07-23 WO PCT/EP2003/050331 patent/WO2004014081A1/fr active Application Filing
- 2003-07-23 CN CNB03818155XA patent/CN100499811C/zh not_active Expired - Fee Related
- 2003-07-23 EP EP03766406A patent/EP1535472A1/fr not_active Ceased
- 2003-07-23 KR KR1020057001595A patent/KR20050030641A/ko not_active Application Discontinuation
- 2003-07-23 US US10/522,521 patent/US20060093030A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998029834A1 (fr) * | 1996-12-30 | 1998-07-09 | Sharp Kabushiki Kaisha | Systeme de codage video oriente images-objets |
Non-Patent Citations (1)
Title |
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See also references of WO2004014081A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN100499811C (zh) | 2009-06-10 |
AU2003262536A1 (en) | 2004-02-23 |
KR20050030641A (ko) | 2005-03-30 |
JP2005535194A (ja) | 2005-11-17 |
US20060093030A1 (en) | 2006-05-04 |
MXPA05001204A (es) | 2005-05-16 |
FR2843252A1 (fr) | 2004-02-06 |
JP4729304B2 (ja) | 2011-07-20 |
WO2004014081A1 (fr) | 2004-02-12 |
CN1672420A (zh) | 2005-09-21 |
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