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    • 4. 发明公开
    • COMPACT CUMULATIVE BIT CURVES
    • KOMPAKTE BIT-SUMMENKURVEN
    • EP2676442A1
    • 2013-12-25
    • EP12704889.0
    • 2012-02-16
    • British Telecommunications public limited company
    • NILSSON, Michael, ErlingTURNBULL, Rory, StewartAPPLEBY, Stephen, CliffordCRABTREE, Ian, Barry
    • H04N7/24
    • H04N19/00169H04N7/12H04N19/146H04N21/23424H04N21/234327H04N21/23439H04N21/2381H04N21/44016H04N21/44209H04N21/6373H04N21/8456
    • Embodiments of the present invention provide a compact representation of a cumulative bit curve formed from piecewise straight line approximations between upper and lower bounds about an actual cumulative bit curve (CBC). In one embodiment the lower bounds are found by applying a constraint such that if a delivery rate was to be calculated using the count at the lower bound it would result in a delivery rate which was greater than the delivery rate that would be calculated using the actual CBC data by a particular amount, for example 10 %. The actual CBC data is then used as an upper bound. As a result, the approximated CBC will lie for each GoP between the actual CBC value and the lower bound, with the result that one can be certain that any data rate that is calculated using the approximation will be at least as high as a data rate that is calculated using the actual CBC data. In terms of line-fitting algorithms that are used, several different algorithms may be used of differing complexities, with the intention of trying to minimise the number of end-points required of within the piecewise approximation.
    • 本发明的实施例提供了一种由关于实际累积位曲线(CBC)的上限和下限之间的分段直线近似形成的累积位曲线的紧凑表示。 在一个实施例中,通过应用约束来找到下限,使得如果使用下限的计数来计算递送率,则其将导致传送速率大于将使用实际的 CBC数据按特定数量,例如10%。 然后将实际的CBC数据用作上限。 因此,近似的CBC将适用于实际CBC值和下限之间的每个GoP,结果可以确定使用近似计算的任何数据速率将至少与数据速率一样高 这是使用实际的CBC数据计算的。 在所使用的线拟合算法方面,可以使用不同复杂度的几种不同的算法,其目的是尽量减少分段近似中所需的端点的​​数量。