[Mp4-tech] How to calculate BDPSNR and BDBR ?

[Lee Daniel]

Dear Experts : 
I've read the Document VCEG-M33, but I still don't understand how to 
calculate it.
It said 0.05db=1% and what does it means. 
Besides, there are many papers using these two parameter to measure bits 
and  PSNR.
Can I transform it to PSNR ?  Please help me. I really want to know this.  
Best regards.     
Daniel.
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