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Building noise profiles from calibration targets

 
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Rareboy



Joined: 28 Dec 2015
Posts: 12

PostPosted: Wed Feb 03, 2016 12:58 pm    Post subject: Building noise profiles from calibration targets Reply with quote

Hello guys, I recently used your calibration target to make noise profiles for my camera at various chip sensitivities and different resolutions.
My main profile was for 1080i 0dB/3dB/6dB.
This was my workflow:
1. Shot calibration target at 1080i at various sensitivities
2. Build 3 Noise Profiles (for different sensitivity) from shot of a calibration target.
3. Tested this noise profile with real footage that was shot on exact same resolution and exact same chip sensitivity

Now I have a question if I can copy/paste noise profiles from pure calibration target shots to real footage to have good noise profile and less noise,
or before every shot i have to shoot calibration target and then shoot the real footage?

I am posting pictures and test footage so you can judge if the whole process went wrong or not:

photo 0 dB unfiltered/filtred
https://www.dropbox.com/s/krg5fd1m1q2ko5w/raw%201080i%20%2B0dB.jpg?dl=0
https://www.dropbox.com/s/fm1qz9fv20cdwhl/reduced%201080i%20%2B0dB.jpg?dl=0

photo 3 dB unfiltred/filtred
https://www.dropbox.com/s/yg9c4uev9tum3zb/raw%201080i%20%2B3dB.jpg?dl=0
https://www.dropbox.com/s/1p8b7odqt6u183n/reduced%201080i%20%2B3dB.jpg?dl=0


photo 6 dB unfiltred/filtered
https://www.dropbox.com/s/bhl4lksfanojmdn/raw%201080i%20%2B6dB.jpg?dl=0
https://www.dropbox.com/s/bodjh6qqif4fiqb/reduced%201080i%20%2B6dB.jpg?dl=0


test footage unfiltered/filtred with noise profiles (+0,+3,+6 dB sensitivities)
https://www.dropbox.com/s/n3fb9gf08sjofn6/TEST.mp4?dl=0

thank you so much
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NVTeam



Joined: 01 Sep 2005
Posts: 2238

PostPosted: Wed Feb 03, 2016 4:45 pm    Post subject: Re: Building noise profiles from calibration targets Reply with quote

Rareboy wrote:
Now I have a question if I can copy/paste noise profiles from pure calibration target shots to real footage to have good noise profile and less noise,
or before every shot i have to shoot calibration target and then shoot the real footage?

Both ways would work. Of course it would work better if you included the target in the beginning of each shot and then built a noise profile using that initial part of the clip.

Vlad
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noise reduction for video and photos
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