Gradient-based Adaptive High Performance Video Coding Rate Control Method
A bit rate control and video coding technology, applied in the field of image communication, to achieve good application prospects, reduce the amount of data remaining in the buffer, and achieve the effect of accurate target bits
Active Publication Date: 2019-05-28
SICHUAN UNIV
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Although compared with H.264 / AVC, the HEVC coding standard saves about 50% of the coding bit rate, but with the emergence of high-definition video, the problem of saving the amount of transmitted data has gradually come into people's view
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[0034] The present invention will be further described in detail below in conjunction with the examples. It must be pointed out that the following examples are only used to further illustrate the present invention and cannot be interpreted as limiting the protection scope of the present invention. Content, making some non-essential improvements and adjustments to the present invention for specific implementation shall still belong to the protection scope of the present invention.
[0035] The adaptive code rate control algorithm of the present invention compares with the interframe coding method of the HEVC standard test model HM10.0 as follows:
[0036] 1. Open the standard HM10.0 test model, the configuration file is lowdelay_P_main, and the output code rate is obtained when the quantization parameters are 22, 27, and 32 respectively without using the code rate control method. The code rate is the target of the code rate control code rate.
[0037] 2. The method of the pres...
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The invention provides a gradient-based adaptive high-performance video coding rate control method for the HEVC video coding standard. The method mainly comprises frame layer rate control based on the buffer state and LCU layer adaptive gradient selection. In frame layer rate control, the target bit of the current frame is adjusted according to the accumulated buffer data volume of coded frames; and in LCU layer rate control, the complexity expressing mode of LCU is improved, the complexity of LCU of an I frame is expressed with the intra-frame gradient, and the complexity of LCU of a non-I frame is expressed with an smaller value adaptively selected from the intra-frame and inter-frame gradients. By adopting the method, the actual rate is more in line with the given target rate, the buffer data volume is decreased significantly, and the output bit levels off. Experimental results show that compared with the HEVC standard rate control proposal K0103, the buffer data volume is reduced by about 41.26% on average, the peak signal-to-noise ratio is increased by about 0.54dB on average, and the rate deviation between the actual rate and the target rate is reduced by about 0.41% on average.
Description
technical field [0001] The invention relates to the problem of video coding code rate control in the field of image communication, in particular to an inter-frame coding self-adaptive code rate control method of the high-performance video coding standard HEVC. Background technique [0002] With the continuous advancement of technology, video resolution is gradually increasing, and video coding standards are also constantly being updated. After the development and improvement of video coding standards such as MPEG, JPEG and H.264 / AVC, a new generation of video coding standard HEVC was born. Although compared with H.264 / AVC, the HEVC coding standard saves about 50% of the coding bit rate, but with the emergence of high-definition video, the problem of saving the amount of transmitted data has gradually come into people's view. Therefore, how to transmit the coded stream in real time with limited bandwidth, reduce the delay as much as possible, and avoid buffer data overflow h...
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IPC IPC(8): H04N19/146H04N19/154
Inventor 何小海付文杰林宏伟熊淑华滕奇志卿粼波
Owner SICHUAN UNIV