A method of rate control in video coding

Abstract

The invention discloses a code rate control method in video coding, which includes: dividing an input video signal into serial video frame images; updating the number of remaining coding bits in the current coding frame; calculating the current basic unit according to the time domain linear prediction model MAD value; if MAD cb If the value is greater than TH, airspace correction is performed; if MAD cb If it is less than TH, no spatial correction will be performed; calculate the number of coding bits to be used for the current macroblock; calculate the quantization parameter QP value of the current macroblock and correct it; perform rate-distortion optimization to obtain the actual MAD value of the current macroblock; loop execution, Until the macroblock in the current basic unit is processed; calculate the next basic unit, and execute it in a loop until the basic unit in the video frame is processed; it can well predict the motion of the current processing unit in time and space, and thus accurately Prediction of technical effects of processing quantization parameters for video encoding.

Description

technical field [0001] The invention relates to the field of railway catenary detection, in particular to a method for bit rate control in video coding. Background technique [0002] In multimedia communications, compressed video streams need to be transmitted over networks with inconsistent and varying bandwidth requirements. Generally speaking, the encoding bit rate is determined by factors such as the characteristics of the input video, the quality of the reconstructed video image, and the frame rate. When the quality and frame rate of the reconstructed video image are the same, for noisy, detailed, and complex motion video sequences, the encoding bit rate is higher. For "clean", smooth, and simple motion video sequences, The encoding bit rate is lower: for the same input video, the higher the quality and frame rate of the reconstructed video image, the higher the encoding bit rate. Therefore, the goal of video coding is to obtain the best possible image quality with th...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a bit rate control method in video coding, which solves the technical problem of inaccurate bit rate control in the existing bit rate control method, and realizes that the current processing unit can be well predicted in terms of time and Spatial motion, so as to accurately predict the technical effect of video coding quantization parameters

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