Coding and decoding method and coding and decoding device for video coding

A video coding and coding technology, applied in the field of video coding

Inactive Publication Date: 2011-06-08
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However the disadvantage of said solution is that it leads to some shift in the reconstructed image which can be attributed to the deviation between motion information and texture

Method used

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  • Coding and decoding method and coding and decoding device for video coding
  • Coding and decoding method and coding and decoding device for video coding
  • Coding and decoding method and coding and decoding device for video coding

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Embodiment Construction

[0034] exist figure 1 The MSRA solution known from the prior art is schematically shown in , which is explained for a better understanding of the invention, since it is at least partially put to use in the described embodiment.

[0035] According to MSRA, the mentioned multi-layer motion estimation is performed in each temporal layer. In this case, the motion estimation is carried out at a fixed spatial resolution with different macroblock sizes, so that the resulting motion vector field is adapted to the decoding resolution. For example, if the original resolution level is a CIF encoding format and the decoding resolution level is implemented as a QCIF format, then the motion estimation is performed at the resolution level of the CIF format or at the CIF resolution, where this takes a block size of 32×32 This is done as the basis and macroblock size 8x8 as the minimum block size. On the contrary, if the decoding format is CIF format, then the size of the macroblock is reduc...

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PUM

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Abstract

The invention relates to a method for the video coding of image sequences. According to said method, images in the image sequence are coded in a scaled manner, in such a way that the video data produced contains information which permits the images to be represented in a plurality of differing stages of image resolution, the latter being defined by the number of pixels per image representation. The coding is block-based, in such a way that to describe a displacement of parts of one of the images, said displacement being contained in the image sequence, at least one block structure that describes the displacement is created. Said block structure is configured from one block, which is subdivided into sub-blocks, whereby some of the sub-blocks are further subdivided into successively smallersub-blocks. According to the invention, a first block structure is temporarily created for at least one first resolution stage and a second block structure is created for a second resolution stage, the first resolution stage having a lower number of pixels than the second resolution stage. In addition, the second block structure is compared with the first block structure to determine the differences in structure, in order to create a modified second block structure on the basis of characteristics of the structural differences, said modified block structure representing part of the second block structure and forming the basis for the coding of the image sequence. The invention also relates to a method for decoding image sequences and to a corresponding coder and decoder.

Description

technical field [0001] The present invention relates to a method for video encoding, a method for decoding, and an encoder and decoding device for video encoding. Background technique [0002] Digital video data is often compressed for storage or transmission in order to significantly reduce large data volumes. In this case, the compression takes place not only by eliminating signal redundancy contained in the video data, but also by removing unimportant signal parts that are not perceptible to the human eye. This is usually achieved by a hybrid coding method, in which first the image to be coded is predicted temporally, and then the residual prediction error is transformed in the frequency domain, for example by discrete cosine transform and quantized there and by variable length coding to encode. Finally, motion information and quantized spectral coefficients are transmitted. [0003] The better the prediction of the image information to be transmitted next, the smaller...

Claims

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Application Information

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IPC IPC(8): H04N7/46H04N7/50H04N7/26H04N7/24
CPCH04N19/00781H04N19/00072H04N19/00175H04N19/00321H04N19/00757H04N19/00436H04N19/00266H04N19/00884H04N19/70H04N19/119H04N19/147H04N19/172H04N19/61H04N19/187H04N19/33H04N19/59H04N19/176H04N19/96H04N19/517H04N19/36H04N19/51H04N19/30
Inventor P·阿蒙A·胡特B·蒂默曼
Owner SIEMENS AG
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