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Universal method applied to kinds of video standards for multi-size two-dimensional integer cosine transform

A video standard and cosine transform technology, applied in the field of digital video signal coding, can solve problems such as increased computational complexity, and achieve the effects of reducing computational complexity, reducing hardware implementation costs, and improving scalability

Inactive Publication Date: 2012-03-21
FUDAN UNIV
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Problems solved by technology

However, the large transformation size also greatly increases the computational complexity.

Method used

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  • Universal method applied to kinds of video standards for multi-size two-dimensional integer cosine transform
  • Universal method applied to kinds of video standards for multi-size two-dimensional integer cosine transform
  • Universal method applied to kinds of video standards for multi-size two-dimensional integer cosine transform

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] The present invention proposes a general method applicable to multiple video standards and multi-size two-dimensional integer cosine transforms, the specific implementation of which is as follows in 6 steps:

[0029] (1) Convert a two-dimensional integer discrete cosine transform into two one-dimensional integer discrete cosine transforms.

[0030] The two-dimensional integer discrete cosine transform can be expressed by the following formula:

[0031] Y = C*X*C T (1)

[0032] Among them, X is the input matrix that requires two-dimensional integer discrete cosine transform, C represents the coefficient matrix of integer discrete cosine transform, * represents matrix multiplication, and C T Represents the transpose matrix of C, and Y represents the calculation result of the two-dimensional integer discrete cos...

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Abstract

The invention belongs to the technical field of digital video signal coding, and particularly discloses a universal method applied to kinds of video standards for multi-size two-dimensional integer cosine transform. A plurality of different video coding standards can be supported by configuring a coefficient value of a constant coefficient multiplier, and simultaneously, the four transformation sizes of 4*4, 8*8, 16*16 and 32*32 are supported. By the method, two-dimensional discrete cosine transform is decomposed into twice one-dimensional discrete cosine transform; when the one-dimensional discrete cosine transform of four points is calculated, a computational load is reduced and computation speed is increased by adopting a conventional butterfly computation method; and an improved butterfly computation method is adopted for the one-dimensional discrete cosine transform of eight points, sixteen points and thirty-two points, so a relatively smaller one-dimensional discrete cosine transform unit can be multiplexed when the one-dimensional discrete cosine transform of a relatively larger size is computed, thereby greatly reducing the hardware resource overhead of the whole system.

Description

technical field [0001] The invention belongs to the technical field of digital video signal coding, and in particular relates to a general method for two-dimensional integer discrete cosine transforms that are applicable to various video standards and can support transformation sizes of 4x4, 8x8, 16x16 and 32x32. Background technique [0002] With the development of video coding technology, more and more video coding standards have entered the application field: VCD / DVD video discs generally use MPEG-1 / MPEG-2 video standards, Blu-ray discs use H.264 standard or VC- 1 standard, the RealVideo or MPEG-4 standard is commonly used in online video, and the AVS video standard has become China's national standard. Many new standards such as H.265 / HEVC (High Efficiency Video Coding) are also being formulated. [0003] Since the discrete cosine transform can effectively concentrate the energy in the frequency domain and facilitate further compression processing, most of the existing ...

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Application Information

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IPC IPC(8): H04N7/30H04N19/122H04N19/156H04N19/60H04N19/625H04N19/70
Inventor 范益波沈沙沈蔚炜曾晓洋
Owner FUDAN UNIV
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