BDPSNR的MATLAB实现

BDPSNR的运算多是通过Joel Jung所设计的excel的 宏函数来计算的, 不过Joel Jung并没有提供源代码， 而且有时候excel在使用上并不方便， Serge 用matlab实现了BDPSNR的计算，会比使用excel方便，　 下面是源码:

function avg_diff = bjontegaard2(R1,PSNR1,R2,PSNR2,mode)

%bjontegaard2    Bjontegaard metric calculation
%   Bjontegaard's metric allows to compute the average gain in PSNR or the
%   average per cent saving in bitrate between two rate-distortion
%   curves [1]. 
%   Differently from the avsnr software package or VCEG Excel [2] plugin this
%   tool enables Bjontegaard's metric computation also with more than 4 RD
%   points.
%   Fixed integration interval in version 2.
%
%   R1,PSNR1 - RD points for curve 1
%   R2,PSNR2 - RD points for curve 2
%   mode - 
%       'dsnr' - average PSNR difference
%       'rate' - percentage of bitrate saving between data set 1 and
%                data set 2
%
%   avg_diff - the calculated Bjontegaard metric ('dsnr' or 'rate')
%   
%   (c) 2