any software 3d comb filters or intelligent noise filters?

Discussion in 'Amateur Video Production' started by AnthonyR, Oct 14, 2004.

  1. AnthonyR

    AnthonyR Guest

    Hi,

    I was wondering if anyone knows of a software 3d noise filter available for
    dv video?
    Something to clean up old video tapes before editing in Premiere and making
    dvd's.

    Thanks in advance,
    AnthonyR
     
    AnthonyR, Oct 14, 2004
    #1
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  2. AnthonyR

    AnthonyR Guest

    I guess the regular Gaussian blur would help with video noise, but I was
    hoping for something more intelligent
    that could differentiate video footage images from random noise pixels and
    just remove the noise without degrading the sharpness of objects. Is that
    asking for too much in 2004?
    I guess it will be in the 2006 feature list? LOL

    AnthonyR.
     
    AnthonyR, Oct 15, 2004
    #2
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  3. AnthonyR

    Mike Kujbida Guest


    I realize that you're using Premiere but what I'm going to give you is a
    post from the Sony Vegas forum (credit to John Meyer) that he titled My
    "ultimate" VHS tape restoration recipe. The underlying principles should be
    applicable to almost any NLE. If you want to read the entire thread, go to
    http://tinyurl.com/5qpoz HTH.

    Mike


    1. Use the best VCR you can find.

    2. Make sure you turn on the Edit switch (sometimes called "tape dub"). This
    defeats the "edge sharpening" circuit which makes some people think the
    picture looks sharper, but actually loses detail. Also, use the S-Video
    output.

    3. Some people recommend using a Time Base Corrector between the VCR and
    your capture device. My understanding of what a TBC does is that it
    regenerates the sync signal which is extremely important if you are going to
    record the signal on another analog tape. I am less certain, however, of its
    importance if you immediately digitize the signal.

    4. Capture your video. I use the pass-throuh on my camcorder. I find this
    works far better than my ATI Radeon 8500 DV capture card.

    Now comes the fun.

    5. For truly amazing results, repeat step 4. That's right, capture the video
    a second time. You then take this video and line it up on the Vegas timeline
    directly above (or below) your original capture. Line the two up so they are
    frame accurate. To do this alignment, set the opacity of the top video track
    to exactly 50%, and then move the event on one track left or right one frame
    at a time until you have perfect alignment. Use only the audio from one of
    the two tracks. Check along the entire timeline to make sure that the video
    hasn't gotten out of sync. If it has, split the video that isn't synced to
    the audio and re-sync the two video tracks (you should have to do this more
    than once or twice, even for a long capture).

    You may find that your second capture is off by half a frame. This is due to
    the fact that the capture card just sees fields coming in and then combines
    them into frames. You therefore have a 50/50 chance of this happening. If it
    does, use this AVISynth script to fix either of the two captures:

    AviSource("e:\my video\VHS.avi")
    SeparateFields
    Trim(1,0)
    Weave

    Once you have fixed the capture, put it on the Vegas timeline and proceed as
    described above.

    [The following was added to the original post: Before rendering, set opacity
    back to 100%, set each track level to 50%, and set composite mode for both
    tracks to "Add." This will create an average of both tracks. If you need to
    average three tracks, set each track level to 33%.]

    Render the results of the merging of these two captures back to another
    file.

    6. You now have either a single capture, or if you are a qaulity freak and
    have nothing better to do with your life, and followed the procedure in step
    number 5, you now have an already vastly improved version of your tape.
    However, regardless of whether you did step 5 or not, you can improve things
    even further. Use the following three filters in VirtualDub, in this order,
    to "scrub" the video:

    Video DeNoise 1.2 (6.4.8)
    Chroma Noise Reduction (1.1)
    NRS (TS 6-10-100)

    Use the defaults for the first two. For NRS, enable only the Temporal
    Smoother, and set the Luminance Thresholds to 6 and 10. Leave everything
    else unchecked and in their default positions.

    This filtering is very subtle, but will get rid of most flicker, most chroma
    fringing (including halos from bad edits on old non-flying erase head
    machines), and introduce almost no visible artifacting. If you want to be
    more aggressive, you can up the thresholds to 8 and 12, or even a little
    higher. However, while you may at first like the results (because these
    settings reduce the noise more), you will start to notice artifacts. Once
    you notice them, you will hate them, and wish you hadn't set the thresholds
    so high.

    After VirtualDub has finished creating the cleaned video, bring this new
    video into Vegas and edit, edit, edit.

    BTW, none of these VirtualDub plugins can be loaded from within Vegas using
    PluginPac because they are temporal in nature, and PluginPac doesn't handle
    temporal plugins (ones that operate on more than one frame at a time).

    Hope this helps someone! I've been working on this off and on for months,
    and I just spent a complete day today testing all the various plugins and
    searching every video forum I could find. The only things that might improve
    on these results would be:

    1. Do more than two captures. Some people have done as many as five (the
    noise reduction improves in a logarithmic fashion, so you get progressively
    less improvement with each subsequent capture). I have not explored this
    because it seemed too time consuming.

    2. Use AVISynth noise reduction filters. There are apparently many more
    noise reduction filters available for AVISynth, but it is difficult to
    interactively test these, so I stayed away from them. (Actually, I did test
    them, and Peachsmoother and Dust are the two you might want to try).

    3. Try the temporal cleaner in SpotRemover. Turn off the spot removing
    function (designed to remove transitory dust specks from film) and just us
    the cleaner. It is miraculous on some scenes, but introduces bad artifacts
    on others. I wanted somthing that worked really well on pretty much any VHS
    video.
     
    Mike Kujbida, Oct 15, 2004
    #3
  4. AnthonyR

    AnthonyR Guest

    Thanks Mike,
    I appreciate that and will go read it now. :)

    AnthonyR.
     
    AnthonyR, Oct 15, 2004
    #4
  5. AnthonyR

    AnthonyR Guest

    Mike,
    Thanks, it was an interesting and long, LOL thread.
    Since then I tried Virtual Dub and a few filters and maybe it can help me
    even on dv-avi's that I
    captured with premiere already.
    See I was under the impression from previous posts you would need to capture
    basically uncompressed
    with Virtual Dub directly using huffyyuv codec and filters and then convert
    to dv-avi.
    Thinking the filters would work better on the uncompressed analog and then
    compress better to DV (5to1 ratio).
    So I had a hard time trying to figure out how to capture directly from
    Virtual Dub without changing my video card etc.

    But last night I did a test on already compressed dv-avi using a few filters
    and think it will help anyway.
    Plus the Canopus ADVC-300 was highly recommended on that thread for saving
    time also. :)

    Thanks,
    AnthonyR.
     
    AnthonyR, Oct 15, 2004
    #5
  6. AnthonyR

    Mike Kujbida Guest


    Glad to have been of help Anthony. I've tried experimenting with Virtual
    Dub and all it's various tools myself but can never find the time (between
    work & family) to get into it very much.

    Mike
     
    Mike Kujbida, Oct 16, 2004
    #6
  7. AnthonyR

    xman Charlie Guest

    I read your forum. Its an interesting software fix.

    I use my panasonic wj-mx12 av mixer to do a similar thing. Put the same
    video through seperate video inputs, output single video feed through my
    firewire. I can correct it real time through the box.

    my 2 cents
     
    xman Charlie, Oct 16, 2004
    #7
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