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H.264 to H.265 transcoding method based on time-dependent rate distortion optimization

A rate-distortion-optimized, time-dependent technique used in communications

Pending Publication Date: 2022-04-29
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

As we all know, because encoding requires the process of rate-distortion optimization cost calculation and optimal encoding mode selection, the complexity of encoding is much higher than the complexity of decoding.

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  • H.264 to H.265 transcoding method based on time-dependent rate distortion optimization
  • H.264 to H.265 transcoding method based on time-dependent rate distortion optimization
  • H.264 to H.265 transcoding method based on time-dependent rate distortion optimization

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Embodiment Construction

[0040] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.

[0041] Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should...

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Abstract

The invention relates to an H.264 to H.265 transcoding method based on time-dependent rate distortion optimization, and belongs to the technical field of communication. The transcoding scheme is mainly divided into two parts, namely a decoder H.264 and a reencoder H.265. And the decoder part comprises entropy decoding, inverse quantization and inverse transformation. The recoding part comprises an information extraction module, an intra-frame prediction part, an inter-frame prediction part, a transformation part, a quantization part and an entropy coding part. The re-encoder information extraction module uses the motion vector information obtained by the decoder to accelerate re-encoding. In order to improve the coding quality, a time-dependent rate-distortion optimization algorithm is added to the recoder part, and a time domain distortion propagation link of the time-dependent rate-distortion optimization algorithm is improved in a targeted manner. According to the scheme, the coding speed is greatly improved while the coding quality is not obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to an H.264-to-H.265 transcoding method based on time-dependent rate-distortion optimization. Background technique [0002] As we all know, unencoded original video information is very large in size, which is very unfavorable for storage and transmission. Video coding aims to remove the spatial and temporal redundancy between image frames, and reduce the encoding bit rate while hardly reducing the image quality, so as to achieve several to hundreds of times the video compression. Coding decisions include coding modes, motion vectors, quantization parameters, variation coefficients, etc. For a video sequence containing coding units, the rate-distortion optimization problem can be formulated as follows [0003] [0004] R i is the bit rate of coding unit i, D i is the distortion of coding unit i, R t Represents the total number of bits, assuming O is a finite set represent...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/40H04N19/567H04N19/91H04N19/176H04N19/513
CPCH04N19/40H04N19/567H04N19/91H04N19/176H04N19/513
Inventor 辛龙坤
Owner CHONGQING UNIV OF POSTS & TELECOMM
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