Can't remove video noise/artifacting (grain in dark areas?))

DeeSeven · #1 03-19-2014, 08:53 AM

hello all

I'm digitally transferring some tapes and I'm running into an issue...the tapes are mostly ok quality, but I can't seem to get rid of this "fuzz" or "noise" over the image..and the more I try to fix it the more i think Im losing my mind with this lol pic is attached using virtualdub

premiumcapture · #2 03-19-2014, 10:24 AM

The fuzz you are referring to is called grain. It is more prevelent in older tapes from what I've seen.

In virtualdub, set up NeatVideo that was included in the pack on this site. if you need help with the setup let me know, but its very easy to use, the only trick is not to overuse it.

DeeSeven · #3 03-19-2014, 10:28 AM

Ty ill give it a try. So its nothing with my setup just the tape has grain

premiumcapture · #4 03-19-2014, 10:31 AM

It might also be oversharpened, but if you can post a short 10-second clip i can play with it and get back to you. If you are capturing uncompressed just use Handbrake to compressthe clip and then post the mkv.

DeeSeven · #5 03-19-2014, 12:52 PM

thanks premium, neatvideo seems to do the trick perfectly thanks again

lordsmurf · #6 07-23-2014, 04:57 AM

This is grain caused by underexposure.
Although NeatVideo will work, it tends to over-filter. I prefer to usage more mild filters in Avisynth or VirtualDub.

DeeSeven · #7 07-23-2014, 08:08 AM

is there anyway to fix the underexposure before capturing like different camera? or its just something that happened when it was filmed? what kind of mild filters do you use on virtualdub for grain?

lordsmurf · #8 07-23-2014, 08:12 AM

A BVP4+ proc amp can sometimes help.
But over/under exposure is a serious photo/video issues. It's hard to unring that bell.

premiumcapture · #9 07-23-2014, 08:19 AM

Exposure = amount of light let into the camera
Too much -> blown out highlights and colors, seen most prominently in bright areas, information lost and too much appears as white
Too little -> everything looks dark, detail lost most prominently in dark areas, blacks crushed.

Most cell phone/tablet cameras are too small to do well indoors and in the dark, and you will see under-exposure a lot. If you have a modern camcorder, you can play with the manual settings and see how this works. Mid to prosumer equipment implement something called gain, which takes in an image brighter than it actually is received, which creates noise but makes the video watchable.