How to calculate PSNR gain?

2 次查看（过去 30 天）
tina jain
tina jain 2015-11-29
评论： Walter Roberson 2015-11-30
I want to calculate averge percentage gain for the PSNR values given in the table
*s.no PSNR at column 1 PSNR a column 2*
1 18.61 21.88
2 18.61 22.68
3 18.61 23.72
please help

请先登录，再回答此问题。

回答（2 个）

Walter Roberson
Walter Roberson 2015-11-29
mean(column2 - column1)
?
  2 个评论
tina jain
tina jain 2015-11-30
It should be mean (column 2- column 1)/mean(column 1)??
Walter Roberson
Walter Roberson 2015-11-30
PSNR is usually stated in dB, and gain is usually stated in dB, so I would expect you to just be using a subtraction like I show. If you use the ratio like you show then the units would be lost. Also since PSNR is based upon log10 you would need to ask whether you should really be dividing the log values as that would correspond mathematically to taking an n-th root of the original values.

请先登录，再进行评论。

Image Analyst
Image Analyst 2015-11-30
meanPsnrCol1 = mean(t{:,2});
meanPsnrCol2 = mean(t{:,3});
where t is your table. Not sure how you're defining gain after that. Maybe
psnrGain = meanPsnrCol2 / meanPsnrCol1;
???
  1 个评论
Image Analyst
Image Analyst 2015-11-30
Or
psnrGain = (meanPsnrCol2 - meanPsnrCol1) / meanPsnrCol1;
Did my code give you the mean of your table columns?

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Image Quality 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by