H.264/AVC code rate control method based on active macroblock concealment

Abstract

An H.264 / AVC code rate control method based on active macroblock concealment comprises the following steps: distributing different target coding bits to a preconfigured ROI macroblock and an NROI macroblock according to the numbers of encoded video frame target bits; then during encoding of the NROI macroblock, under the premise of an H. 264 / AVC standard rate distortion model, adding an active macroblock concealment mode, and performing mode selection and encoding according to a constructed rate distortion function; during encoding of the ROI macroblock, adopting an encoding method specified by H. 264 / AVC standards to encode; after the encoding of the macroblocks is completed, starting code rate control of next macroblock. According to the method, when the active macroblock concealment mode is selected to encode, the current macroblock of an NROI does not need encoding, so that required bits are reduced; the saved bits are distributed to an uncoded ROI macroblock, so that the ROI macroblock acquires more bites, the encoding quality of the ROI is improved, and meanwhile, the visual quality is improved.

Description

technical field [0001] The invention relates to a H.264 / AVC code rate control method, in particular to an H.264 / AVC code rate control method based on active macroblock concealment. Background technique [0002] With the rapid development of network technology, the transmission technology of video data in the Internet and mobile network has become a hot spot of current informatization. The video signal has a large amount of data, and the video content is bursty, which requires efficient data compression and bit rate control for the video before transmission to meet the requirements of network transmission bandwidth. H.264 / AVC is a popular high-efficiency video compression standard; however, there is no code rate control algorithm defined in H.264 / AVC. [0003] Aiming at the above problems, many current researches focus on designing reasonable rate control algorithms to improve end-to-end video quality. According to the sensory characteristics of the human eye, some schemes ...

AI Technical Summary

Problems solved by technology

According to the sensory characteristics of the human eye, some schemes propose rate control based on sub-regions, and assign different numbers of bits to different regions according to the different sensory effects of the regions on the human eye, so as to control the bit rate; Adjust the quantization parameters to perform rate control, but the existing rate control methods still cannot improve the encoding quality of the area of ​​interest to the human eye

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