Video noise

vitalforces wrote on 5/18/2004, 11:44 AM

I tried searching this on the forum but I can't seem to hit the right terms. I am capturing footage shot in 24p with a DVX100, and some of the scenes are darkly lit, and a little video noise can be seen in the shadows. Assuming I can't afford to reshoot the scenes, wasn't there some discussion about techniques to remove or minimize noise in under-lit shots?

Comments

Spot|DSE wrote on 5/18/2004, 12:01 PM

Median filter....Light noise redux is a good place to start. Then the Convolution filter, coupled with dual overlay tracks, but start with median, render out a short section to see what it looks like

johnmeyer wrote on 5/18/2004, 1:05 PM

Do a search in this (Vegas) forum for "VirtualDub" and "Noise". Vegas does not have any temporal filters, and you will get better results (in my opinion) with a temporal filter, since the noise spots do not show up in the same position from one frame to the next. There are also several really good AVISynth filters (like Peachsmoother) that work with that product. Both VirtualDub and AVISynth are free programs, as are the plugins.

I also wrote quite a bit about how to reduce noise on VHS tapes. Some of the same techniques will work with any video footage, although the multiple capture technique definitely does not apply to digital captures because every capture produces absolutely identical pixels, whereas analog video capture does not. So, if you ignore all the disucssion about multiple captures in the following set of posts, you may find some information that is useful for your current situation:

My "ultimate" VHS tape restoration recipe

Within that long thread, this is the link that provides the tools and settings that I use for general "snow" noise reduction on most video:

VirtualDub Video Cleaning Settings

vitalforces wrote on 5/18/2004, 1:30 PM

Thanx Spot & johnmeyer. Can't wait to leave the office and get back to my la-bor-a-tor-y to try these things out.

farss wrote on 5/18/2004, 3:37 PM

Also have a look at dvxuser.com. Lots of discussion on this very topic and camera over there, even a Vegas forum. I know it's a bit late now but you can do a bit to reduce the noise in the camera to start with.