公开(公告)号：US20040037357A1

公开(公告)日：2004-02-26

申请号：US10459104

申请日：2003-06-10

Applicant: STMicroelectronics S.r.I.

Inventor： Daniele Bagni ,  Flavio Benussi ,  Bruno Biffi

IPC: H04N007/12

CPC classification number: G06T9/005 ,  G06T9/007 ,  H04N19/124 ,  H04N19/149 ,  H04N19/15 ,  H04N19/152 ,  H04N19/159 ,  H04N19/172 ,  H04N19/61

Abstract: A method for controlling the bit-rate of a bitstream of encoded video signals at a variable bitrate, the bitstream being generated by compressing a video sequence of moving pictures, wherein each picture comprises a plurality of macroblocks of pixels compressed by any of transform coding, temporal prediction, bi-dimensional motion compensated interpolation or combinations thereof, to produce any of I and/or P and/or B frames, the method involving quantization of said macroblocks effected as a function of a quantization parameter. The method includes defining a target bit-rate as well as maximum positive and negative error values between the target bit-rate and an average value of the current bit-rate of the bitstream, controlling the current bit-rate in order to constrain it between said maximum positive and negative error values, and defining an allowed range of variation for updating at least one reference parameter representative of the average value of the quantization parameter over each picture, wherein said allowed range is determined as a function of the target bit-rate and the maximum positive and negative error values.

Abstract translation: 一种用于以可变比特率控制编码视频信号的比特流的比特率的方法，所述比特流是通过压缩运动图像的视频序列而产生的，其中每个图像包括通过任何变换编码压缩的多个像素宏块， 时间预测，双维运动补偿内插或其组合，以产生I和/或P和/或B帧中的任一个，所述方法涉及作为量化参数的函数而影响所述宏块的量化。 该方法包括在目标比特率和比特流的当前比特率的平均值之间定义目标比特率以及最大正和负误差值，控制当前比特率以便将其限制在 所述最大正和负误差值，并且定义允许的变化范围，用于更新表示每个图像上的量化参数的平均值的至少一个参考参数，其中所述允许范围被确定为目标比特率的函数 和最大正负误差值。