A rate control method based on spatial-temporal context and motion complexity

Abstract

The present invention relates to a code rate control method based on space-time domain context and motion complexity, comprising: based on the R-λ model, before C0 encoding, its model parameters α and β are updated for the first time; the current basic unit C0 encodes; wait for all the basic units in the frame where C0 is encoded, and then update the second-step parameters of the current basic unit; the model parameters after the two-step parameter update will be used to guide the target bit allocation of the basic unit layer; definition The relative motion complexity coefficient of the current basic unit C0 is used to represent the intensity of motion of different basic units; the Wi,j of the current basic unit C0 is used to adjust the λ value of the current basic unit, so that the λ value adapts to the intensity of motion of different basic units, so that Achieving the goal of allocating more bits to basic units with more motion. The invention can ensure that the basic unit block with higher motion complexity is divided into more target bits, thereby helping to improve the quality of the video.

Description

technical field [0001] The invention belongs to the field of video coding, and in particular relates to a code rate control method for improving the accuracy of code rate control. Background technique [0002] With the development of computer network, communication technology and multimedia technology, video-related applications become more and more extensive. However, the video data is often very huge, and the storage and transmission of video brings great challenges to the existing storage and communication systems. Video compression technology must be used to reduce the storage capacity and transmission bandwidth of video. The code rate control technology is an important link in the video compression technology. Through the code rate control, under the constraints of the code rate and the buffer zone, the coding parameters can be adaptively adjusted to make the code stream adapt to the channel transmission bandwidth, and Minimize video distortion. [0003] Since the rel...

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Problems solved by technology

However, the rate control method based on the R-λ model also has certain limitations. In terms of parameter update, only the time correlation is used and the spatial correlation is ignored, so that the updated parameters are not accurate; the target bit allocation at the basic unit layer On the one hand, it is based on the following assumption: basic units at the same level and at the same position may have the same model parameters, but if the current basic unit moves violently, the difference between it and the basic unit at the corresponding position of the reference picture is usually large, so the two use the same Model parameters are not accurate

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