Removing Blemishes from a 3d (stereoscopic) video

While Capturing old video footage (as outlined in a previous post) I hit an issue resulting from the old beam splitter having a rather large bit of fluff on the left hand mirror when the footage was taken. While it is still possible to enjoy the footage this proved to be very distracting and I wondered if there was a way to “soften this distraction” by replacing the blemish in the left eye view with the (offset) clean footage from the right eye view. This would surely still be a distraction (as this small section of the stereoscopic window would be in only pseudo 3d) but nevertheless I felt sure that it would still be an improvement.

I put the technicalities of this question to an online stereoscopic forum that I have been a member of for some years and got a few replies suggesting that ideally I would need to build a depth map of the original footage (to negate the 2d effect in the replaced section of the image) – but I have to admit that this approach went beyond the amount of work I wanted to do! Happily one of the members, Barry Aldous, came up with a simpler solution and also provided detailed instructions to allow me to carry out the work required. Barry used “Cyberlink Power Director” in conjunction with the excellent “Stereo Movie Maker” in his instructions but for my purposes I have transposed these instructions for use in Vegas.

Briefly the steps taken are as follows:

  1. Produce separate left and right versions of the video files
  2. Overlay the Left file on top of the right and “punch a hole” that matches the blemished area to produce a “new” left video file
  3. Create a stereoscopic video using the original right and new left video files.
  1. Separating Left and Right Videos in Vegas:
From Project properties Render first a left (see above) and then a right video

2. 1 Open and drag the right image to the top and left image to the bottom:

2.1 Add a Bezier Mask from the VideoFX tab to the topmost video and adjust to fit (I used the invert option to make this easier and also used the feathering option to soften the edges). I also found that the result was most effective when the image showing through the masked area is shifted (using the Pan/Crop Video effect) so that it matches the left image as far as possible (best when the area being filmed with the blemish showing remains a static distance from the camera) a bit of trial and error was needed here but I found it possible to get a satisfying result without too much trouble.

2.2 Render the video as a 2d video name “New Left” or similar

3. Bring the original right and “New Left videos back into a new project:

Select both clips and then use the right click submenu to “pair as a stereoscopic clip”

3.1 Render out the result as a new stereo clip

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