PSNR comparison of HM and x264

[legenden]

Hellou,

Hello,

After encoding with HM11, I got this information about PSNR:

http://pokit.org/get/?793e9c22d1ac95c072bbc40c33707735.jpg

And after x264 encoding, I got this about PSNR:

http://pokit.org/get/?da28bbf2d23c9465b985b06c9d7d1fd1.jpg

So, HM gave me PSNR for Y U and V components for all, I,P,B slices and x264 gave me PSNR for Y U V, average PSNR and global.

Now, how can I make comparison in terms of PSNR?

[pandy]

Now, how can I make comparison in terms of PSNR?

Calculate average PSNR and compare with average PSNR.

[x265_Project]

The standard formula for a global PSNR value is ...

(6 * YPSNR + UPSNR + VPSNR) / 8

Y is weighted more heavily because your eye has higher sensitivity to details in black and white (luma) than in color (chroma).

[Daemon404]

The standard formula for a global PSNR value is ...

(6 * YPSNR + UPSNR + VPSNR) / 8

Y is weighted more heavily because your eye has higher sensitivity to details in black and white (luma) than in color (chroma).

I don't know where you get this "standard" from. Google literally shows this post as the first result. Also where the heck does 6 or 8 come form? Y has 4x the number of pixels as U or V. Seems pretty arbitrary.

[x265_Project]

I don't know where you get this "standard" from. Google literally shows this post as the first result. Also where the heck does 6 or 8 come form? Y has 4x the number of pixels as U or V. Seems pretty arbitrary.

I'm not sure where the formula originated. For sources, you can look at the first slide on this presentation... ftp://ftp.hhi.de/ieee-tcsvt/2012/StandardsComparison/results/Overview.pdf

YUV-PSNR =

6 Y-PSNR + U-PSNR + V-PSNR
8

It's also mentioned on slide 19 of http://www-ee.uta.edu/Dip/Courses/EE5359/Projects/Spring2013/Valay_Shah/Valay_Shah_Final.pptx


The formula is simply saying that your eye is 3 times more sensitive to video noise (error) in luma than it is in chroma.


Tom
MulticoreWare