Mode-dependent transforms for residual coding with low latency

A technology for encoding and residual data, which is applied in the fields of digital video signal modification, electrical components, image communication, etc., and can solve problems such as low secondary transformation delay.

Inactive Publication Date: 2014-03-12
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology

But for a practical implementation, the latency of the secondary transformation should be low

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  • Mode-dependent transforms for residual coding with low latency
  • Mode-dependent transforms for residual coding with low latency
  • Mode-dependent transforms for residual coding with low latency

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[0082] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the present invention as defined by the claims and their equivalents. The description includes various specific details to aid in that understanding, but these details are to be regarded as exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

[0083] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it will be apparent to those skilled in the art that the following descr...

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Abstract

An apparatus and method for processing video data are provided. The method includes determining a primary transform CN for application to residual data at an encoder, determining a secondary transform TrK for application to the residual data, applying the primary transform CN to the residual data, and selectively applying the secondary transform TrK to the residual data, wherein N denotes the length size of the input vector on which the primary transform CN is applied, and K denotes the length of the first few coefficients of the primary transform output on which the secondary transform TrK is applied. Similar inverse operations are performed at the decoder, viz., selectively applying an inverse secondary transform inv(TrK) at the decoder for the input residual data, followed by application of the inverse primary transform inv(CN).

Description

technical field [0001] The present invention relates to a device and method for video coding. More specifically, the present invention relates to an apparatus and method for determining a transform for residual coding. Background technique [0002] In the current standard of High Efficiency Video Coding (HEVC), an alternative transform to the standard Discrete Cosine Transform (DCT) is proposed for intra prediction residuals. These transformations can be broadly categorized as training-based transformations or pattern-based transformations. A prominent transformation among training-based transformations is the mode-dependent directional transformation (MDDT). In MDDT, a large training set of error residuals is collected for each intra prediction mode, and then the residual training set is used to compute the optimal transformation matrix. However, MDDT requires a large number of transformation matrices (eg, up to 18 at block sizes of N=4 and N=8). Mode-based transforms a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/12H04N19/103H04N19/176
CPCH04N19/00218H04N19/00078H04N19/00278H04N19/12H04N19/159H04N19/176
Inventor 安克·塞克森纳菲利克斯·卡洛斯·费尔南德斯
Owner SAMSUNG ELECTRONICS CO LTD
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