Hair in gate

Discussion in 'Amateur Video Production' started by blacklight, Dec 15, 2006.

  1. blacklight

    blacklight Guest

    The short nature clips on our site rent-a-cloud.com are first shot on
    film. Then we transfer them to avi for post-production using Sony's
    Vegas 5. We just come back from a shoot in Central Australia, and one
    roll of film shows a hair in the gate. Question: is there any software
    which can remove that hair out of the image (the hair is static)?
    Thanks for answer.
     
    blacklight, Dec 15, 2006
    #1
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  2. blacklight

    Ken Maltby Guest

    Until a better answer pops up, you might consider
    a VirtualDubMod filter named "Region Remove" you
    will need to call it a number of times to get it to cover
    the shape of your hair. Done very carefully removing
    such a small object, could be extreamly effective.

    Be sure to try turning off the detection in directions that
    would include a part of the hair. (If the hair is mainly
    horizonal, then you would turn off the right & left detection;
    if it were mostly vertical then turn off the top & bottom.)
    You will probably want to play with the number of pixels
    from the edge it uses, as well.

    http://www.videohelp.com/tools?tool=Virtualdub_Region_Remove_Filter

    Luck;
    Ken
     
    Ken Maltby, Dec 15, 2006
    #2
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  3. blacklight

    Ray S Guest

    Boris Red has a Wire Removal filter designed which may work well for
    something like that. After Effects as well can probably do it.

    Thing is, these tools are rather expensive. Anything that would let you
    do frame by frame retouching would do the trick as well. Notice the
    words - frame by frame - yes, it would be as much work as you imagine.
     
    Ray S, Dec 15, 2006
    #3
  4. blacklight

    Scubajam Guest

    If there is something you REALLY need, there is a way, but it's
    cumbersome. As mentioned before, modify EVERY FRAME. So the footage
    had better be worth the effort. 29.97 frames per second.

    I use Ulead software. Just got the first program bundled with a
    Firewire card, and used it ever since. The nice thing, they offer free
    trials of all their programs, and except for not getting support or
    updates, the software isn't crippled. Some other programs offer free
    trials, but limit features or put a watermark on output.

    For example, capture, then bring into Ulead Video Paint. Take a
    similar background from around the hair area, and paint it over the
    hair. May have to take several backgrounds. For each frame! It
    works, but it's a lot of work. You can try filters, etc, but they will
    probably degrade quality all over the frams. Maybe you can crop some
    frames? I did this with a video shoot where we were supposed to be on
    a deserted island, shipwrecked. A beach scene had aa speedboat go by
    in the background. Larger and moving, so much more complicated than
    your hair. Still, we managed to erase the boat, and the wake that went
    mostly all the way across each frame. It took us hours, and we missed
    one frame completely. Since it was a fun spoof it just added to the
    effect.

    Jim McGauhey
    Washington State
     
    Scubajam, Dec 15, 2006
    #4
  5. Lucky for the poster that they only shoot 25fps in Australia ;-)

    -m-
    --
     
    Martin Heffels, Dec 15, 2006
    #5
  6. blacklight

    marks542004 Guest

    I would transfer it to video and then look for a effects shop that has
    the tools to do the removal quickly.

    A lot is going to depend on how the hair is positioned , what sort of
    background and if the camera is moving.

    Frame by frame is gonna be a lot of work.
     
    marks542004, Dec 15, 2006
    #6
  7. blacklight

    blacklight Guest

    Thank you all for the replies. I had been afraid of something like
    that: fiddling with over 2000 frames (and yes, we do shoot 25fr/sec). I
    had hoped that there might be a tool which would repeat the same action
    2000 times once frame 1 was done.
    What misery! - Klaus
     
    blacklight, Dec 16, 2006
    #7
  8. blacklight

    Ken Maltby Guest

    Did you even take a look or give Region Remove a try?
    It could be a way to do it with an automated process.
    Well, no skin off my nose.

    Luck;
    Ken
     
    Ken Maltby, Dec 17, 2006
    #8
  9. blacklight

    FCP User Guest


    This is not that complicated.

    I don't use Vegas, but it's pretty similar to Final Cut which I use
    every day.


    If your shot is static and you have any frames of the background prior
    to the arrival of the hair - just grab a still frame from the "hairless"
    frame - crop it and and matte it over the "hair" area of the shot.

    That's simple, easy and foolproof.


    If the shot is moving, it's a bit more complicated, but not terribly
    difficult.

    There are a couple of approaches depending on the content and how much
    precision you need.


    Generally, you need to isolate the part of the timeline where the hair
    resides. Then open up a new video track and clone the original video
    clip onto it. This gives you two identical video tracks stacked on top
    of each other in perfect sync.

    Crop the new layer of video video very tightly using a garbage matte to
    isolate just the hair itself with as little background as possible.

    Then Shift the clip on the cloned layer so that instead of showing the
    hair, it shows the pixels directly adjacent to the hair - and works for
    motion video because the cloned area will move in sync.

    Typically, the hair will simply disapper.

    If the crop is tight, that may be enough.

    Depending on the nature of the shot, you might also try the simpler
    solution of doing a matte around the hair and simply applying a gaussian
    blur. That can de-emphasize the hair to the point where it's not
    distracting.

    There are other techniques as well, but they depend on the nature of the
    footage, the amount of movement, and how convincingly you want to "sell"
    the composite.

    But the tools are likely already in Vegas, you just need someone who
    understands how to use them.

    Good luck.
     
    FCP User, Dec 18, 2006
    #9
  10. It's not that easy. Because if you do this with a still, you got an area
    where the grain doesn't move. Unless you can add grain to that section, one
    would be far better to clone the area, or if not possible with the
    software, mask it, put a second layer of the same material below it, and do
    s slight 2D-shift.

    Maybe I'm too much of a perfectionist :))

    cheers

    -martin-
    --
     
    Martin Heffels, Dec 18, 2006
    #10
  11. blacklight

    Ray S Guest

    Sigh....I wish the mistakes in MY videos would stand still so I could
    just crop them out like this.......
     
    Ray S, Dec 18, 2006
    #11
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