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    • 9. 发明申请
    • METHOD AND APPARATUS FOR BIT RATE CONTROL IN SCALABLE VIDEO SIGNAL ENCODING USING A RATE-DISTORTION OPTIMISATION
    • 使用速率失真优化的可扩展视频信号编码中的比特率控制的方法和装置
    • WO2007101791A1
    • 2007-09-13
    • PCT/EP2007/051670
    • 2007-02-21
    • THOMSON LICENSINGZHU, Li HuaXU, LongCHEN, Zhi Bo
    • ZHU, Li HuaXU, LongCHEN, Zhi Bo
    • H04N7/26H04N7/50
    • H04N19/615H04N19/103H04N19/105H04N19/124H04N19/14H04N19/147H04N19/159H04N19/176H04N19/19H04N19/194H04N19/30H04N19/63
    • In many video encoding bit rate control models such as TMN8 and RHO domain, the distortion D has been described as a uniform weighted distortion. According to the invention an approximated but still easy-to-use Laplacian distribution model is calculated for the quantisation step size adapta- tion in the macroblock layer bit rate control. The inventive bit rate control uses a pre-analysis step (LPPREA, HPPREA) that calculates the standard deviation of the input signal amplitudes in each macroblock in a Group of Frames. Using the corresponding standard deviation value determined in the pre-analysis step, in a motion estimation/compensation step (CQPEMB) the best mode for the P and B pictures and the ac- tual standard deviation of the prediction residual for the macroblocks are obtained, whereby a rate distortion optimi- sation processing using the Laplace distribution is per- formed. For I frames an intra prediction is carried out by which the best prediction mode and the actual standard de- viation of the prediction residual for the macroblocks are obtained, and a rate distortion optimisation processing us- ing the Laplace distribution is performed. Thereby for I and P frames the quantisation parameter for each macroblock is obtained and used in a corresponding quantisation that fol- lows transform (TRF1) of the prediction or motion estima- tion/compensation residual. For the B frames the bit rate control is carried out once again in an actual coding step, i.e. the quantisation parameter for a current macroblock is computed with the inventive improved TMN8 bit rate control using the best mode and the actual standard deviation obtained from the ME/MC stage.
    • 在诸如TMN8和RHO域的许多视频编码比特率控制模型中,失真D被描述为均匀的加权失真。 根据本发明,对于宏块层比特率控制中的量化步长适应性,计算出近似但仍然易于使用的拉普拉斯分布模型。 本发明的比特率控制使用预分析步骤(LPPREA,HPPREA),其计算帧组中的每个宏块中的输入信号幅度的标准偏差。 使用在预分析步骤中确定的对应的标准偏差值,在运动估计/补偿步骤(CQPEMB)中获得P和B图像的最佳模式以及宏块的预测残差的实际标准偏差, 从而进行使用拉普拉斯分布的速率失真优化处理。 对于I帧,执行帧内预测,​​通过该帧内预测获得宏块的预测残差的最佳预测模式和实际标准偏差,并且执行使用拉普拉斯分布的速率失真优化处理。 因此,对于I和P帧,获得每个宏块的量化参数,并在下面的预测或运动估计/补偿残差变换(TRF1)的量化中使用。 对于B帧,在实际编码步骤中再次执行比特率控制,即,使用最佳模式和从ME获得的实际标准偏差,利用本发明改进的TMN8比特率控制来计算当前宏块的量化参数 / MC舞台。