How to remove grainy background ?

[gchan]

Setup
VS11

Recording mode DV

Canon xh a1

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Currently Im editing a dance performance.

The backdrop is black. Because of poor lighting I recorded the video with f 2.8 - f 3.6.

While playing it back the backdrop looks all grainy. Lighting on dancer face is ok enough to see her expressions.

I tried autolevel but it does not help much.

Is there any other setting which will help in reducing the grainy backdrop.

thanks

[gchan]

Any idea how to solve this problem ?

[lancecarr]

Probably no answers because no-one has any bright ideas so far.
Have you tried the "de-noise" filter in VS? You may have to play around with it to see if you can get a result.
The problem with most filters at this level is that they will apply across the whole frame when what you want is just the background handled.
Anyway, give it a try.

[MrA]

Probably no answers because no-one has any bright ideas so far.
Have you tried the "de-noise" filter in VS? You may have to play around with it to see if you can get a result.
The problem with most filters at this level is that they will apply across the whole frame when what you want is just the background handled.
Anyway, give it a try.

I have ideas, but, none will work with VS, but work sort of "ok" in MSP 8, therefore this is a worthless post. (except I know how to do it in MSP

BTW, De-noise will degenerate the quality, by itself considerably.

You have the some how enhance the brightness, then de-noise, then smoothe the result.

[sjj1805]

Perhaps if you posted a screen shot so that we can see the extent of the problem.

Technically you can clean it up but practically it would be impracticable.
My youngest lad is a James Bond fan and so at Christmas time one of his presents just had to be the latest boxed set of digitally enhanced James Bond Videos.

I watched with him one of the 'extra videos' which was a documentary about how they cleaned up the original films. Dr No was digitally re-mastered and looked as good quality as any modern day movie created with the technology now available.

Briefly they extracted each frame as a still image and then used an image editor to tidy the picture up and then recreate a movie from all of those individual cleaned up frames. The procedure to do this is outlined in this tutorial:
MediaStudio/VideoStudio: Use A Video Sequence File

For Home Users and small commercial enterprises this is not practical for anything longer than a few minutes duration due to the time it will take.
Obviously for the big Hollywood Studios they can afford to employ staff to work on such a project lasting a few months due to the revenue that will then be earned by worldwide distribution.

[gchan]

in VS11

I used DeBlock, it helped to greater extent to remove grainy background.

[Clevo]

I don;t think there is much you can do about it to be frank. I work in a TV broadcast Library and I see this happening all the time on dark background/night time, shot with a digital video camera.

[gchan]

Oh ok.

From your experience is there any way to avoid it in first place ?

[Black Lab]

Yes. Plenty of light on the subject. Other than that there's really not much you can do.

[Clevo]

Oh ok.

From your experience is there any way to avoid it in first place ?

Never saw it on an analogue tape (betacam SP)

Only on Digital Betacams or SX Betacams.

[heinz-oz]

It's called digital noise and different chips are effected slightly different. The only way to avoid it is using a good quality camera and plenty of light.