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Bidirectional intra-frame directional prediction method and device

A technology for intra-frame prediction and prediction direction, which is used in digital video signal modification, electrical components, image communication, etc., and can solve problems such as poor prediction, increased distance between predicted pixels and reference pixels, and reduced prediction accuracy.

Inactive Publication Date: 2018-03-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The existing intra-frame directional prediction technology has the following disadvantages: 1. Poor prediction for complex textures such as textures with directional gradient characteristics; 2. The distance between the predicted pixel and the reference pixel increases, and the prediction accuracy decreases; 3. The direction There is a borderline discontinuity in sex prediction

Method used

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Embodiment 1

[0056] The inventive technology of this embodiment can be applied to encoding blocks or decoding blocks of different sizes such as 4x4, 4x8, 8x8, 8x16, and 16x16 to perform bidirectional intra-frame directional prediction.

[0057] Figure 7 It shows the generation process of the prediction pixels of the first bidirectional prediction mode. Combine now Figure 7 Give specific instructions.

[0058] The coordinates of the predicted pixel at the upper left corner of the current coding block are (0,0). The absolute value of the row coordinates of the current pixel is defined as the horizontal distance between the current pixel and the predicted pixel whose coordinates are (0,0), and the absolute value of the column coordinates of the current pixel is defined as the current pixel and the predicted pixel whose coordinates are (0,0). Predict the vertical distance between pixels. If the current pixel is located to the right of the predicted pixel with coordinates (0,0), the row c...

Embodiment 2

[0069] The inventive technology of this embodiment can be applied to encoding blocks or decoding blocks of different sizes such as 4x4, 4x8, 8x8, 8x16, and 16x16 to perform bidirectional intra-frame directional prediction.

[0070] Figure 7 The process of generating the predicted pixels of the first bidirectional prediction mode is shown. Combine now Figure 7 Give specific instructions.

[0071] The coordinates of the predicted pixel at the upper left corner of the current coding block are (0,0). The absolute value of the row coordinates of the current pixel is defined as the horizontal distance between the current pixel and the predicted pixel whose coordinates are (0,0), and the absolute value of the column coordinates of the current pixel is defined as the current pixel and the predicted pixel whose coordinates are (0,0). Predict the vertical distance between pixels. If the current pixel is located to the right of the predicted pixel with coordinates (0,0), the row co...

Embodiment 3

[0082] The inventive technology of this embodiment can be applied to encoding blocks or decoding blocks of different sizes such as 4x4, 4x8, 8x8, 8x16, and 16x16 to perform bidirectional intra-frame directional prediction.

[0083] Figure 7 The process of generating the predicted pixels of the first bidirectional prediction mode is shown. Combine now Figure 7 Give specific instructions.

[0084] The coordinates of the predicted pixel at the upper left corner of the current coding block are (0,0). The absolute value of the row coordinates of the current pixel is defined as the horizontal distance between the current pixel and the predicted pixel whose coordinates are (0,0), and the absolute value of the column coordinates of the current pixel is defined as the current pixel and the predicted pixel whose coordinates are (0,0). Predict the vertical distance between pixels. If the current pixel is located to the right of the predicted pixel with coordinates (0,0), the row co...

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Abstract

The invention provides a bidirectional intra-frame directional prediction method and device. According to the method, the texture gradient property of a coding block is utilized, and the defect that the boundary discontinuity of intra-frame prediction and the intra-frame prediction precision are reduced as the distance between a prediction pixel and a reference pixel is increased is solved. According to the method, the gradient characteristic of a residual error of the coding block is considered, and the prediction adopts an exponential relationship between a weighting coefficient and the distance between the prediction pixel and the reference pixel, so that the intra-frame prediction performance is improved. The invention further provides a corresponding device while the bidirectional intra-frame directional prediction method is provided.

Description

technical field [0001] The present invention relates to video encoding and decoding, and more particularly relates to a video encoding and decoding method and device that adopts a bidirectional intra-frame directional prediction mechanism to improve intra-frame encoding performance. Background technique [0002] Compared with H.264 / AVC, HEVC also uses pixel prediction in the spatial domain. By increasing the number of prediction modes, the intra-frame prediction direction is more refined, and the texture in different directions is better simulated, thereby further reducing the prediction residual. energy, ultimately improving encoding performance. [0003] HEVC defines 35 intra-frame prediction modes for the luma component, including 33 unidirectional directional prediction modes and 2 non-directional prediction modes DC and Planar, such as Figure 9 shown. Prediction modes 2 to 18 belong to the horizontal family of forecasting modes, and forecasting modes 19 to 34 belong t...

Claims

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Application Information

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IPC IPC(8): H04N19/503H04N19/587H04N19/109H04N19/176
Inventor 虞露陈佳伟
Owner ZHEJIANG UNIV
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