A method for VBR code rate control in AVX decoding of real time video signals

Abstract

The invention discloses a VBR bit rate control method of a real-time video signal in the AVS coding process. According to the forecasting complexity of the current image group, the object bit rate ofthe current image group is allocated, object bit numbers are equally distributed to an image in the current image group, according to a rate distortion model, and the quantification parameter of the image is calculated. When the scene change is detected, the corresponding residual bit numbers in the image group where the image with abrupt complexity is positioned are updated. the accuracy of the bit rate control is ensured, the defined bit rate can be better approached, the video quality is improved, the overall quality reduction caused by the quality fluctuation is avoided, thus ensuring thatthe smoothing property of the video quality is better; the invention can better distribute the object bit rate of the current image group according to the forecasting complexity of the current imagegroup, and has stronger adaptability to message source; the invention has the advantages that the pre-coding analysis is not required to the imaged, and the coding is operated once, and has the advantages that the calculation complexity is low, the calculation intensity is low, the decoding complexity can be decreased, and the real time is improved.

Description

technical field [0001] The invention relates to a video signal processing method, in particular to a method for controlling the VBR code rate in the AVS encoding process of real-time video signals. Background technique [0002] AVS (Audio Video coding Standard, digital audio and video coding standard) is China's first second-generation digital audio and video coding standard with independent intellectual property rights. The full name is "Advanced Audio and Video Coding Standard for Information Technology". Its coding Efficiency and competitiveness are equivalent to the international standard MPEG-4 / H.264, representing the current international advanced level. [0003] Bit rate control is one of the important technologies of video coding, which plays an extremely important role in video transmission, video storage and hardware design. VBR (Variable Bit Rate, variable bit rate) code rate control coding is ideally based on the source characteristics of the video sequence, dyn...

AI Technical Summary

Problems solved by technology

[0011] 1) The introduction of the quadratic R-D model and the MAD linear prediction model also increases the computational complexity. For embedded processors, the cycle operations occupied by the multiplication operation are much larger than the general addition, subtraction, and shift operations. For real-time video coding applications , which is a big challenge for embedded processors;

[0012] 2) Video coding itself has a relatively high amount of computation, coupled with the high computation-based macroblock used in the computation process, combined with the RDO bit rate control method, this will become a bottleneck for the real-time application of the encoder;

[0013] 3) Due to the allocation method of the code rate of the algorithm GOP (Group of Picture) and the assumed reference decoder buffer mechanism, the further improvement of the smoothness of the quality before and after is limited

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