A method for intra-frame fast selection of inseparable quadratic transform modes based on mode-dependent properties

A secondary conversion and fast selection technology, applied in the field of video coding and decoding, can solve the problems of low coding efficiency and achieve the effects of improving coding efficiency, simple scheme, and reducing computational complexity

Active Publication Date: 2020-01-31
CENT SOUTH UNIV
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Problems solved by technology

[0008] The present invention is aimed at the new generation of video coding standards in the prior art, and the intra-frame coding efficiency is too low, and proposes a fast intra-frame selection method based on an inseparable quadratic transformation mode, by predicting the index value of the best NSST mode in advance, skipping Its unnecessary index loop process reduces the computational complexity of the encoder, reduces encoding time, and improves encoding efficiency while ensuring that the subjective quality of the video is negligible.

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  • A method for intra-frame fast selection of inseparable quadratic transform modes based on mode-dependent properties
  • A method for intra-frame fast selection of inseparable quadratic transform modes based on mode-dependent properties
  • A method for intra-frame fast selection of inseparable quadratic transform modes based on mode-dependent properties

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] Such as figure 1 As shown, a fast intra-frame selection method based on the inseparable quadratic transformation mode, including the following steps:

[0030] Step 1: Determine whether the current unit CU to be encoded is located at the start position or edge position of the entire encoding area, if so, proceed to step 2, if not, proceed to step 3;

[0031] Determined by the coding order of the encoder, the adjacent units of these four positions have been encoded before the current CU to be encoded, the reference information is complete, and because the correlation between the adjacent positions of the encoded image is strong, experiments show that using these encoding The information of the block is used as the reference of the current CU to be encoded, and the average correlation is as high as more than 90%.

[0032] Step 2: Perform complete en...

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Abstract

The invention discloses an intra-frame selection method of an inseparable secondary conversion mode based on mode dependence feature. The method comprises the following steps: predicting an index value of an optimal mode of the MDNSST and reducing a candidate angle mode in advance by using the time-space relevancy of a coding unit CU of an adjacent location in a video sequence, thereby skipping unnecessary index cyclic process and avoiding the time-consumed MDNSST mode selection process in the coding procedures. Under the condition of guaranteeing the negligible subjective quality reduction ofthe video, the computing complexity of a coder is lowered, the coding time is reduced, and the coding efficiency is improved. And meanwhile, the scheme disclosed by the invention is simple and practicable, and in favor of industrially popularizing of the next generation video coding standard.

Description

technical field [0001] The invention belongs to the field of video encoding and decoding, and in particular relates to an intra-frame rapid selection method of an inseparable quadratic transformation mode based on the mode dependence characteristic. Background technique [0002] NSST (Non-separable Secondary Transform) is an inseparable secondary transformation. In early video coding, the encoder used DCT (Discrete Cosine Transform) discrete cosine transform for video compression. But the traditional DCT is a suboptimal transformation, and when the residual signal has a large diagonal component, DCT cannot effectively compress the signal energy. In the new-generation video coding standard, NSST replaces the DCT in the original standard, and effectively compresses the signal through secondary transformation. NSST in the new generation of video coding has mode-dependent characteristics, also known as MDNSST (ModeDependent Non-separable Secondary Transform). Recently, the for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/103H04N19/593H04N19/147H04N19/154
CPCH04N19/103H04N19/147H04N19/154H04N19/593
Inventor 张昊王塞博雷诗哲牟凡符婷
Owner CENT SOUTH UNIV
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