Code rate controlling method for video coding based on Rho domain

Abstract

The invention relates to a video coding code rate control method based on a Rho domain, which pertains to the technical field of multimedia communication; the invention comprises the steps as follows: the bit rate of a group of pictures (GOP) is confirmed according to a given target code rate, and the bit rate distribution of frame-level is further respectively confirmed according to three frames which are an I-frame (Intra-frame frame), a P-frame (unidirectional predictive frame) and a B-frame (bidirectional predictive frame); the characteristic parameters of the previous frames of the same type are checked to predict the slope parameter Theta of a linear code rate model, model interception difference Delta c, the ratio s of motion vector code rate and entropy coding code rate that is quantified by residual coefficient, and zero coefficient proportion Rho that meets the code rate limit is calculated; a Rho-QP mapping table is referred to obtain a quantization parameter (QP) which is used for coding the current video frame. The code rate control method of the invention is simple and practical, and has excellent performance and the original video coding standards.

Description

Video coding rate control method based on ρ domain Technical field The invention belongs to the technical field of multimedia communication, and particularly relates to a low-complexity ρ-domain-based video coding rate control method. Background technique In video communication, the network bandwidth that carries the data stream is time-varying and limited. Researchers must consider not only the pure compression efficiency, but also the matching relationship between the channel bandwidth and the source rate, that is, video encoding Perform code rate control to make full use of the channel. For the existing block-based hybrid video coding schemes, such as MPEG-4, the existing rate control methods are usually from the frame type (I frame, P frame and B frame), group of pictures (GOP) structure (IPP, IBP) , IBBP, etc.), buffer limitation, bit rate model, computational complexity and other perspectives, by dynamically adjusting the quantization parameter (QP) and other encoder param...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to overcome the deficiencies of the prior art, based on the spatial linearity and time domain continuity of video content, to provide a low-complexity video coding rate control method based on the ρ domain, which is simple and practical, and has superior performance , the computational complexity and memory requirements are extremely small, not only suitable for the previous video coding standards H.261, H.263, MPEG-2, MPEG-4, but also suitable for the latest H.264 standard

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