Low-delay video coding rate control method

Abstract

The invention discloses a low-delay video coding rate control method. The method comprises the following steps of: judging whether a current frame needs to be subjected to quality refreshing or not, and initializing a quantization step size according to a judgment result; determining a function relationship among coding cost, the quantization step size and a bit consumption number through a gradient descent method, and further predicting the bit number of the current frame; and further adjusting the quantization step size according to the predicted bit number of the current frame, and finally mapping the quantization step size into the QP parameter of the current frame. According to the code rate control method provided by the invention, the video quality can be greatly improved without causing significant code rate improvement, and the algorithm used by the invention is high in precision and low in complexity, and the coding delay is reduced.

Description

Technical field [0001] The present invention relates to the field of image coding, and more particularly to a low delay video coding rate control method. Background technique [0002] The encoded code rate control means that by selecting a series of encoded parameters, the bit rate after the video encoding satisfies the required rate limitation, and the encoding distortion is as small as possible. Among them, the encoding parameters need to be determined before or in the encoding process, and the number of bits after video encoding requires encoding to know, and the encoding parameter determines the final bit rate, so there is a "egg paradox". [0003] In the code rate control of video encoding, if you try to encode a given target code rate limit, the general practice first estimate the code cost of the current code control unit, and then the number of bits predicts the current code control unit, then adjustment quantization The step size causes the predicted bit to tend to targe...

AI Technical Summary

Problems solved by technology

This bit rate allocation method can balance the image quality and bit rate to a certain extent. However, the traditional bit rate control method is slightly insufficient in ensuring the image quality when the video content does not change much.

When the video content changes little, due to the large quantization step size setting, the reference frame is greatly distorted

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