Abstract: In order to obtain accurate quantization parameters for rate control, an improved basic unit layer rate control method for JVT-H017 is proposed. This paper presents a spatial-temporal correlation model, instead of the original linear one to predict the mean absolute difference of the basic unit. At the same time, according to the different complexity estimation of each macro-block in one basic unit, its quantization parameter can be amended adaptively. Experimental results show that the algorithm can avoid the process of updating the parameters and reduce the computational complexity, improve the quality of video encoding and increase the control precision of output rate.

Key words: rate control, basic unit layer, spatial-temporal correlation, adaptive bit allocation