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Intra-frame prediction pixel generation method and device

A technology for predicting pixels and intra-frame prediction, which is applied in image communication, digital video signal modification, electrical components, etc., and can solve problems such as texture deflection across projection surfaces

Active Publication Date: 2018-07-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] For this reason, the present invention proposes a method for generating intra-frame prediction pixels, which solves the problem of texture deflection across projection planes

Method used

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  • Intra-frame prediction pixel generation method and device

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Embodiment 1

[0052] This embodiment combines Figure 2c The method for generating intra-frame predicted pixels will be specifically described by taking the current predicted pixel located on the projection plane 1 and the reference pixel located on the projection plane 2 as an example.

[0053] In the first step, according to the position of the current predicted pixel in the projection plane 1 (x 1 ,y 1 ) and the intra-frame prediction mode of the block where the current predicted pixel is located, the position of the reconstructed pixel corresponding to the predicted pixel is obtained according to the directional prediction method (x 2 ,-0.5).

[0054] In the second step, since the current predicted pixel is in projection plane 1 and the reference pixel is in projection plane 2, x 2 It cannot be used as the coordinate position of the reference pixel yet, but needs to be offset. From the x obtained in the first step 2 , calculate the reconstruction pixel offset T according to the pro...

Embodiment 2

[0068] This embodiment combines Figure 2c The method for generating intra-frame prediction pixels will be specifically described by taking the current prediction pixel located on projection plane 1 and the reference pixel located on projection plane 2 as an example.

[0069] In the first step, there are A continuous predicted pixels in the same column in the projection plane 1, which is the first group of predicted pixels, and its position is (x 1,i ,y 1 ) (i=0,1,...,A-1). According to the position of the first group of predicted pixels in the projection plane 1 and the intra prediction mode of the block where the predicted pixels are located, the reconstructed pixel position (x') corresponding to the first group of predicted pixels is obtained according to the directional prediction method 1，i , -0.5). The value of A should be a natural number greater than 1, for example, A is 4, or 8, or 16, etc. In the same column in the projection surface 1, there are other B continuo...

Embodiment 3

[0093] This embodiment combines Figure 2e The method for generating intra-frame prediction pixels will be specifically described by taking the current prediction pixel located on projection plane 1 and the reference pixel located on projection plane 2 as an example.

[0094] In the first step, there are A continuous predicted pixels in the same row in the projection plane 1, this is the first group of predicted pixels, and its position is (x 1,i ,y 1 ) (i=0,1,...,A-1). According to the position of the first group of predicted pixels in the projection plane 1 and the intra prediction mode of the block where the predicted pixels are located, the reconstructed pixel position (x') corresponding to the first group of predicted pixels is obtained according to the directional prediction method 1，i , -0.5). The value of A should be a natural number greater than 1, for example, A is 4, or 8, or 16, etc. In the same row in the projection surface 1, there are another B continuous pr...

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Abstract

The invention provides an intra-frame prediction pixel generation method and device. The intra-frame prediction pixel generation method comprises the following steps: firstly, according to an intra-frame prediction mode adopted by a current block and the position of a current predicted pixel in the block, determining the position of a reconstructed pixel corresponding to the predicted pixel whichis obtained by the predicted pixel according to a directional prediction mode; then, performing calculation in combination of the reconstructed pixel position to obtain reconstructed pixel offset corresponding to the predicted pixel; taking the reconstructed pixel position and the reconstructed pixel offset as a reference reconstructed pixel position for the predicted pixel; or, carrying out precision control of specified sub-pixel precision on the reconstructed pixel offset to obtain approximate offset meeting specified sub-pixel precision requirements; taking the reconstructed pixel positionand the approximate offset as a reference reconstructed pixel position for the predicted pixel; finally, copying a pixel value of the reference reconstructed pixel position as a prediction value of the predicted pixel. According to the method and the device provided by the invention, the problem of cross-projection plane texture deflection is solved.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit and priority of Chinese Patent Application No. 201710041539.5 filed on January 20, 2017, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to an intra-frame prediction mechanism of video coding and decoding, and more particularly relates to a method and a device for generating intra-frame prediction pixels using geometric projection relations. Background technique [0004] Virtual reality uses 360-degree panoramic video, which makes users have a strong sense of immersion. 360-degree panoramic video is often projected into a 2D plane for encoding and decoding, and the projection methods include equirectangular (ERP), cubemap (cubemap, CMP) and octahedron (OHP), etc. Different projection methods have different numbers of projection surfaces; multiple projection surfaces will have different arrangements when compos...

Claims

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Application Information

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IPC IPC(8): H04N19/159H04N19/593H04N19/176H04N19/182
CPCH04N19/159H04N19/176H04N19/182H04N19/593
Inventor 虞露陈佳伟
Owner ZHEJIANG UNIV