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Method of alternative transform for data compression

A technology of inverse conversion and conversion unit, which is applied in the field of signal processing and can solve problems such as signal distortion

Active Publication Date: 2017-02-22
HFI INNOVATION INC
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Problems solved by technology

The transform coefficients are then quantized using a quantizer (130), which can lead to signal distortion

Method used

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  • Method of alternative transform for data compression
  • Method of alternative transform for data compression
  • Method of alternative transform for data compression

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Embodiment Construction

[0023] The following description contains the best mode of carrying out the invention. This description is for the purpose of illustrating the general principles of the invention and should not be taken as limiting. The scope of the invention is best determined by reference to the appended claims.

[0024] In HEVC, discrete cosine transform (DCT) and discrete sine transform (DST) can be used to process the residual signal. For intra prediction residuals, the known energy is usually larger in the lower right corner and decreases from the lower right corner to the upper left corner as the prediction distance decreases. Therefore, some other transformations, such as DST-VII and the mirror-flipped version of DCT-IV (FDCT-IV), may be more suitable than DCT. DST-VII has been used for 4x4 luma intra prediction residuals in HEVC.

[0025] Equations (2) and (3) show the N-point DST-VII and DCT-IV of the signal f[n], respectively.

[0026]

[0027]

[0028] Mirror-flipped DCT-...

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Abstract

A method and apparatus of adaptive image and video coding including an alternative transform other than the discrete cosine transform (DCT) and discrete sine transform (DST) type VII (DST-VII) are disclosed. For at least one block size belonging to the size group, a transform from multiple transforms comprising an alternative transform in addition to DCT and DST-VII is selected and applied to a current block. The alternative transform may correspond to DCT type IV (DCT-IV) or DST type IV (DST-IV).

Description

[0001] [Cross-reference to related applications] [0002] This application claims priority to PCT patent application serial number PCT / CN2014 / 077493 filed on May 14, 2014, which is hereby incorporated by reference in its entirety. [0003] 【Technical field】 [0004] The present invention generally relates to signal processing. In particular, the invention relates to transitions in video or image coding. [0005] 【Background technique】 [0006] Discrete cosine transform type two (DCT-II) is commonly used in signal processing, especially for lossy data compression, due to its strong "energy-squeezing" properties. For image and video compression, no explicit reference to a specific type of DCT implies DCT-II. In DCT-II representation, most signal information tends to be concentrated in some low frequency components. For certain restricted signals based on Markov methods, DCT-II approximates the Karhunen-Loève transform, which is optimal in decorrelating the underlying signals ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/12
CPCH04N19/12H04N19/157H04N19/159H04N19/176
Inventor 安基程张凯
Owner HFI INNOVATION INC
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