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Directional intra-prediction coding

An intra-frame prediction mode and coding technology, applied in image communication, digital video signal modification, electrical components, etc., can solve the problem of consuming computing or communication resources

Inactive Publication Date: 2019-12-27
GOOGLE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Digital video streams can contain large amounts of data and consume significant computing or communication resources of computing devices used to process, transmit, or store the video data

Method used

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  • Directional intra-prediction coding
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  • Directional intra-prediction coding

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Embodiment Construction

[0038] As noted above, compression schemes associated with encoding a video stream may include: decomposing an image into blocks; and generating a digital video output bitstream using one or more techniques to limit the information included in the output bitstream (i.e., encoded bitstream). The received bitstream can be decoded to recreate the block and source image from limited information. Coding a video stream or a portion thereof (eg, a frame or a block) may include using spatial similarity in the video stream to improve coding efficiency. For example, a current block of a video stream may be encoded based on identifying differences (residuals) between previously coded pixel values ​​or combinations of previously coded pixel values ​​and those in the current block.

[0039] Encoding using spatial similarity may be referred to as intra prediction. Intra prediction attempts to predict pixel values ​​for a current block of a frame of a video stream using pixels on the perip...

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Abstract

Coding a current block using a directional intra-prediction mode is described. A filter to apply to reference pixels peripheral to the current block is determined using a prediction angle of the intra-prediction mode and, optionally, a size of the current block. The reference pixels are filtered using the filter to generate modified reference pixels, and a prediction block is generated for the current block using the intra-prediction mode and the modified reference pixels.

Description

Background technique [0001] A digital video stream can represent video using a series of frames or still images. Digital video can be used for a variety of applications including, for example, video conferencing, high-definition video entertainment, video advertising, or the sharing of user-generated video. Digital video streams can contain large amounts of data and consume significant computing or communication resources of computing devices used to process, transmit, or store the video data. Various methods, including compression and other encoding techniques, have been proposed to reduce the amount of data in a video stream. [0002] Spatial similarity-based encoding may be performed by decomposing a frame or image into blocks that are predicted based on other blocks within the same frame or image. The difference between the block and the predicted block (ie the residual error) is compressed and encoded in the bitstream. The decoder uses the differences and reference fra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/593H04N19/117H04N19/176H04N19/159
CPCH04N19/117H04N19/159H04N19/176H04N19/593
Inventor 约瑟夫·扬
Owner GOOGLE LLC