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Size of the noise profile rectangle

 
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jpsdr



Joined: 11 Aug 2008
Posts: 193

PostPosted: Mon Aug 03, 2009 8:16 am    Post subject: Size of the noise profile rectangle Reply with quote

Hello.
I've until now only worked on DVD format picture (720x480), and
when building noise profile, i've noticed roughly the size needed to
have very low frenquency.
I've just begin to try this WE to do the same thing on HD vide
(1920x1080). I was telling me : I will be very easy to get very
low frequency, as picture is bigger, so i'll be able to easely get
an uniform part of the picture.
What was my surprise when i noticed that the size is not fixed,
but seem proportionnal to the picture.
So my question is : Are the size for each step (high frequency,
low... very low) fixed (16x16, 32x32, .... 128x128) ? Or are they
proportionnal to the picture (5%x5%, ... 20%x20%) ? I must say
that i was expecting the first, but, actualy, at least in the VD filter,
i'm experienced the second. Is it normal ?
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NVTeam



Joined: 01 Sep 2005
Posts: 2237

PostPosted: Mon Aug 03, 2009 1:11 pm    Post subject: Reply with quote

Each step is fixed, not proportional.

Please double-check the frame size, selection size and viewer zoom levels used to build profiles. I am sure you will find that the selection sizes are what they are supposed to be.

Thank you,
Vlad
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noise reduction for video and photos
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jpsdr



Joined: 11 Aug 2008
Posts: 193

PostPosted: Mon Aug 03, 2009 1:29 pm    Post subject: Reply with quote

So, you're telling me that with a 1440x1080 video, a viewever zoom wich
allow me to see the whole picture, the rectangle for very low frequency
should be a lot smaller in the picture than the same rectangle for
a 720x480 video, when the whole picture as around the same
size in the viewer windows ? (100% for 720x480 and around 50%
for 1440x1080). If your answer is yes, i'm having a problem, beacause
actualy it's not the case...
(My PC screen is at 1024x768, so i'm around 50% in the viewer
for HD, and 100% for SD).
I will double check this evening, but actualy i'm around 99% sure
of this (still stay 1%.... you put me doubt... ^_^).
On your side, can you quick verify by opening a 1440x1080 file in
VDub, and verify the size of the selection rectangle ?
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NVTeam



Joined: 01 Sep 2005
Posts: 2237

PostPosted: Mon Aug 03, 2009 1:49 pm    Post subject: Reply with quote

It is all very easy to check: in the bottom of the NV window (the leftmost part), when you are drawing a selection you can see the selection size in pixels. Draw a new selection and check its size when drawing, you will see how the selection frame changes its thickness when coming over the size thresholds.

Vlad
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noise reduction for video and photos
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jpsdr



Joined: 11 Aug 2008
Posts: 193

PostPosted: Mon Aug 03, 2009 5:30 pm    Post subject: Reply with quote

Sorry, my mistake, it was the 1%...

I must previously have made a false manipulation.
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