function?avg_diff?=?bjontegaard（R1PSNR1R2PSNR2mode）

%BJONTEGAARD????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.
%
%???R1PSNR1?-?RD?points?for?curve?1
%???R2PSNR2?-?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）?2010?Giuseppe?Valenzise
%
%???References:
%
%???[1]?G.?Bjontegaard?Calculation?of?average?PSNR?differences?between
%???????RD-curves?（VCEG-M33）
%???[2]?S.?Pateux?J.?Jung?An?excel?add-in?for?computing?Bjontegaard?metric?and
%???????its?evolution

%?convert?rates?in?logarithmic?units
lR1?=?log（R1）;
lR2?=?log（R2）;

switch?lower（mode）
????case?‘dsnr‘
????????%?PSNR?method
????????p1?=?polyfit（lR1PSNR13）;
????????p2?=?polyfit（lR2PSNR23）;

????????%?integration?interval
????????min_int?=?min（[lR1;?lR2]）;
????????max_int?=?max（[lR1;?lR2]）;

????????%?find?integral
????????p_int1?=?polyint（p1）;
????????p_int2?=?polyint（p2）;

????????int1?=?polyval（p_int1?max_int）?-?polyval（p_int1?min_int）;
????????int2?=?polyval（p_int2?max_int）?-?polyval（p_int2?min_int）;

????????%?find?avg?diff
????????avg_diff?=?（int2-int1）/（max_int-min_int）;

????case?‘rate‘
????????%?rate?method
????????p1?=?polyfit（PSNR1lR13）;
????????p2?=?polyfit（PSNR2lR23）;

????????%?integration?interval
????????min_int?=?min（[PSNR1;?PSNR2]）;
????????max_int?=?max（[PSNR1;?PSNR2]）;

????????%?find?integral
????????p_int1?=?polyint（p1）;
????????p_int2?=?polyint（p2）;

????????int1?=?polyval（p_int1?max_int）?-?polyval（p_int1?min_int）;
????????int2?=?polyval（p_int2?max_int）?-?polyval（p_int2?min_int）;

????????%?find?avg?diff
????????avg_exp_diff?=?（int2-int1）/（max_int-min_int）;
????????avg_diff?=?（exp（avg_exp_diff）-1）*100;
end

?屬性????????????大小?????日期????時間???名稱
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?????文件???????2219??2014-02-12?13:09??bjontegaard\bjontegaard.m

?????文件???????1318??2014-02-12?13:09??bjontegaard\license.txt

?????文件????????445??2014-02-12?13:09??bjontegaard\test_bjontegaard.m

?????目錄??????????0??2019-01-16?17:58??bjontegaard

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?????????????????3982????????????????????4