Intra-frame quick selection method based on non-separable secondary transform mode

A fast selection and secondary transformation technology, applied in the field of video codec, can solve the problem of low coding efficiency, achieve the effect of improving coding efficiency, reducing coding time, and reducing computational complexity

Active Publication Date: 2018-07-24
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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  • Intra-frame quick selection method based on non-separable secondary transform mode
  • Intra-frame quick selection method based on non-separable secondary transform mode
  • Intra-frame quick selection method based on non-separable secondary transform mode

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[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0042] Such as figure 1 As shown, it is a schematic flow chart of the present invention, a fast intra-frame selection method based on an inseparable quadratic transform mode

[0043] method, including the following steps:

[0044] Step 1: Use the quadtree division depth QTDepth and binary tree division depth BTDepth of the coding unit CU at the current depth to determine whether entry condition 1 is satisfied, and if not, proceed to step 2; otherwise, proceed to step 4;

[0045] Condition 1: QTDepth≧2&&BTDepth≧1

[0046] Satisfying condition 1 indicates that the depth of the current CU is relatively high, skip the NSST index cycle under the current depth, and directly enter step 4;

[0047] For CUs with a low depth, enter step 2, that is, perform a complete NSST index cycle at the current depth;

[0048] Step 2: Perform a complete NSST index cycle o...

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Abstract

The invention discloses an intra-frame quick selection method based on a non-separable secondary transform mode. By means of the spatial-temporal correlativity of coding units (CU) which are located at the same location and different depths in a video sequence, an index value of an optimal NSST mode is predicted in advance, the unnecessary index cycling process is skipped, the time-consuming NSSTmode selection process in the coding process is avoided, and on the condition that it is guaranteed that the video subjective quality reduction is negligible, the computing complexity of a coder is reduced, the coding time is shortened, and the coding efficiency is improved. Meanwhile, the scheme is simple, easy to operate and beneficial to industrial popularization of a new-generation video coding standard.

Description

technical field [0001] The invention belongs to the field of video encoding and decoding, in particular to an intra-frame fast selection method based on an inseparable quadratic transform mode. 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. Recently, the establishment of a new generation of video coding standards has introduced a large number of new coding tools, and NSST is one of them. [0003] In recent years, with the application of high-definition and ult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/11H04N19/96
CPCH04N19/11H04N19/96
Inventor 张昊王塞博雷诗哲牟凡符婷
Owner CENT SOUTH UNIV
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