Adding psnrb

[soma2000-lang]

What does this PR do?

Part of #799

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[soma2000-lang]

@Borda @SkafteNicki Any help regarding the failing tests would be really helpful

[SkafteNicki]

Some comments, already looking good.
Please also add entry in changelog :)

[soma2000-lang]

@SkafteNicki I have almost made all the changes as you suggested ,but I require some help as to what might have caused this error while running pytest

[soma2000-lang]

@Borda @SkafteNicki I cannot understand why its still giving the import error,even after the init file has been fixed.

[Borda]

@Borda @SkafteNicki I cannot understand why its still giving the import error,even after the init file has been fixed.

seems you used the previous PSNR but did not update the class name, also curious if we could rather reuse some functionality instead of writing all from the ground... 🐰

[codecov]

Codecov Report

Merging #1421 (8181e61) into master (527afbe) will decrease coverage by 45%.
The diff coverage is 30%.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1421     +/-   ##
========================================
- Coverage      88%     42%    -45%     
========================================
  Files         238     240      +2     
  Lines       13360   13510    +150     
========================================
- Hits        11741    5738   -6003     
- Misses       1619    7772   +6153