轉自http://www.cnblogs.com/mlj318/archive/2012/10/31/2748574.html

A、VCEG 建議采用Bjontegaard metric described in [1] to provide relative gain between two methods,by measuring average difference between the two RD-curves.

? ? ?參考[3]中的文檔提供了這兩種值的計算工具：the bitrate saving between two methods, for a given objective quality; and the PSNR-Y delta for a given bitrate ?.

? ?由此可見?Bj?ntegaard delta bit rate (BDBR) 表示了在同樣的客觀質量下，兩種方法的碼率節省情況(Rate/distortion curves 畫一條水平線)

? ? ?Bj?ntegaard delta peak signal-to-noise rate (BD-PSNR)表示了在給定的同等碼率下，兩種方法的PSNR-Y的差異(Rate/distortion curves 畫一條垂直線)。

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B、在HEVC中，[4]提供另外一種使用五點來計算BD-PSNR/Rate的工具，

參考：

[1]???? G. Bj?ntegaard, “Calculation of average PSNR differences between RD-Curves,” ITU-T SG16 Q.6 Document, VCEG-M33,Austin,US, April 2001

[2]???? G. Bj?ntegaard, “Improvements of the BD-PSNR model,” ITU-T SG16 Q.6 Document, VCEG-AI11,Berlin,Germany, July 2008

[3] ? ? ?An excel add-in for computing Bjontegaard metric and its evolution,VCEG-AE07?

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[4] ? ?BD-PSNR/Rate computation tool for five data points,JCTVC-B055?

[5] ? ?S. Pateux, Tools for proposal evaluations, JCTVC-A031, April 2010.

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