EP1285538A1 - Procede pour coder par transformation des sequences d'images animees - Google Patents

Procede pour coder par transformation des sequences d'images animees

Info

Publication number
EP1285538A1
EP1285538A1 EP01921209A EP01921209A EP1285538A1 EP 1285538 A1 EP1285538 A1 EP 1285538A1 EP 01921209 A EP01921209 A EP 01921209A EP 01921209 A EP01921209 A EP 01921209A EP 1285538 A1 EP1285538 A1 EP 1285538A1
Authority
EP
European Patent Office
Prior art keywords
transformation
coding
blocks
block
motion compensation
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.)
Withdrawn
Application number
EP01921209A
Other languages
German (de)
English (en)
Inventor
Alexander Romanowski
Sven Bauer
Peter Siepen
Mathias Wien
Thomas Wedi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1285538A1 publication Critical patent/EP1285538A1/fr
Withdrawn legal-status Critical Current

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
    • H04N19/57—Motion estimation characterised by a search window with variable size or shape
    • 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
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/119—Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
    • 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
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/12—Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
    • H04N19/122—Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type
    • 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
    • H04N19/136—Incoming video signal characteristics or properties
    • H04N19/137—Motion inside a coding unit, e.g. average field, frame or block difference
    • 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
    • H04N19/176—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 block, e.g. a macroblock
    • 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
    • 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 is based on a method for
  • Transformation coding of moving image sequences in which motion vectors with which the motion compensation is carried out are estimated in blocks between a reference image signal and a current image signal of the image sequence.
  • a motion vector field is estimated block by block between a previously created picture signal (reference frame) and a current frame of a picture sequence and then one with this vector field
  • Block transformations are usually used to code the prediction error, usually a discrete cosine transformation (DCT) with 8 8 coefficients.
  • DCT discrete cosine transformation
  • Transformation coding used [1, 2].
  • Motion compensation uses blocks of size 16 x 16 and 8 x 8 pixels and with MPEG-4 in the case of interlaced coding also 16 x 8 pixels [1].
  • the size of the block transformation is constant with 8 x 8 coefficients.
  • the method according to the invention namely the coupling of the block size of the transformation for the prediction error to the block size used in motion compensation, is Particularly advantageous if the blocks to be transformed are not only limited to square shapes, but also allow rectangular blocks, for example 4 x 8 or 16 x 8 pixels.
  • the use of block sizes coupled to the motion compensation offers the advantage of being able to jointly transform maximally large parts of the prediction error without the block boundaries contained therein having disruptive high-frequency
  • Proportions reduce the transformation gain. An increased coding efficiency is thereby achieved.
  • the energy of the transformed signal is concentrated on a few coefficients by the transformation.
  • the number of consecutive zeros within blocks is increased by using larger blocks, which can be used for more effective coding (run-length coding).
  • FIG. 1 shows a possible division of a macroblock into subblocks
  • FIG. 2 shows an adaptive block division of a macroblock
  • the picture sequence frames are divided into macro blocks (MB), which consist of a block with 16 x 16 pixels of the luminance component and two corresponding chrominance blocks, often 8 x 8 pixels, 4: 2: 0 YUV format [5].
  • MB macro blocks
  • the first block represents a macro block with 16 x 16 pixels
  • the finely divided macro block has 4 x 4 sub-blocks.
  • Motion compensation is performed. Different block sizes are used.
  • the prediction error is transformation coded.
  • the block size of the transformation coding is coupled to the block size used in motion compensation, in particular the block size for the
  • Transformation coding of the prediction error is chosen equal to the block size that was used for the motion compensation. Not only square but also rectangular blocks are permitted in order to be able to transform large parts of the prediction error together. This leads to a very effective coding, since the block sizes for the motion compensation are already to be coded in the transmission bit stream and thus for the adaptive transform coding with regard to them
  • Block sizes no further signaling is required.
  • the number of consecutive zeros within the blocks can be used for an effective coding, in particular a run length coding.
  • Figure 2 shows some macro blocks MB with 16 x 16 pixels in the upper left corner of a frame.
  • the macroblocks MB are marked with small letters for the rows and large letters for the columns.
  • Macroblock MB (aA) is divided into four sub-blocks, each of which is assigned a motion vector. Each of these sub-blocks is predicted independently of the others from the reference frame. MB (aB) has only one motion vector, so the sub-block here corresponds to the entire macro block MB. In the MB (bA) example, there are eight sub-blocks that are predicted independently of one another with their own motion vectors. The prediction error that remains with the motion compensation also shows the block structure shown.
  • the information about the sub-block division of the macro blocks known from the motion compensation is used.
  • that block transformation is selected that has the same block size as the subblocks. So: in the Macroblock MB (aA), each of the four sub-blocks is transformed with an 8 x 8 transformation.
  • Macroblock MB (aB) gets a 16 x 16 transformation, macroblock MB (aC) two 8 x 16 transformations etc.
  • the block size of the transformations corresponds to that Block size of the motion compensation (size of the sub-blocks).
  • Separable transformations are used, i.e. the transformation matrix is applied in the horizontal and vertical directions, i.e. in the square case
  • T is the transformation matrix of size n x n. This is orthogonal, i.e.
  • Tft denotes the transformation matrix for the rows, T v that for the columns.
  • Unnormalized transformation matrices can be assumed, especially if integer transformations are used. In this case, no generally applicable quantizer can be specified step by step. Since, in general, a uniform distortion is desirable in all blocks of the encoded frame must quantizer tables are created in which a predetermined encoding for qp for each occurrence of a block form qp j _ is assigned to a corresponding.
  • T ⁇ is an nxn and T v is an mxm matrix. Then the quantizer step size for the nx m block B-j_ with

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

L'invention concerne un procédé pour coder par transformation des séquences d'images animées, ledit procédé consistant à évaluer en bloc des vecteurs de mouvement qui servent à réaliser une compensation de mouvement. L'erreur de prédiction est codée par transformation. Selon l'invention, la taille des blocs du codage par transformation est couplée à la taille des blocs utilisés pour la compensation de mouvement. On améliore ainsi l'efficacité du codage de l'erreur de prédiction dans des procédés de codage hybrides utilisant différentes tailles de blocs.
EP01921209A 2000-05-10 2001-03-16 Procede pour coder par transformation des sequences d'images animees Withdrawn EP1285538A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10022331A DE10022331A1 (de) 2000-05-10 2000-05-10 Verfahren zur Transformationscodierung von Bewegtbildsequenzen
DE10022331 2000-05-10
PCT/DE2001/001018 WO2001086961A1 (fr) 2000-05-10 2001-03-16 Procede pour coder par transformation des sequences d'images animees

Publications (1)

Publication Number Publication Date
EP1285538A1 true EP1285538A1 (fr) 2003-02-26

Family

ID=7641163

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01921209A Withdrawn EP1285538A1 (fr) 2000-05-10 2001-03-16 Procede pour coder par transformation des sequences d'images animees

Country Status (5)

Country Link
US (1) US7397857B2 (fr)
EP (1) EP1285538A1 (fr)
JP (1) JP2003533141A (fr)
DE (1) DE10022331A1 (fr)
WO (1) WO2001086961A1 (fr)

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WO2010051846A1 (fr) * 2008-11-06 2010-05-14 Nokia Corporation Algorithme de sélection de blocs rapide pour le codage vidéo utilisant une transformation variable dans l'espace

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Also Published As

Publication number Publication date
DE10022331A1 (de) 2001-11-15
US7397857B2 (en) 2008-07-08
WO2001086961A1 (fr) 2001-11-15
JP2003533141A (ja) 2003-11-05
US20040062309A1 (en) 2004-04-01

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