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Old March 3rd, 2006, 07:51 AM   #1
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DV Up-Resing

On the rare occasion when a dv/hdv/digital/sd/whatever piece of footage makes it into a main stream piece of cinema, mostly documentaries really, seems to me that say DV footage in this case is somehow uprezed from 720 x 480 to the film format, I know you can just up-rez things, but I was curious to know besides just blowing it straight up if there's a way to kind of refine the pixelization and somehow infuse it with more resolution, I heard of(never seen) software that will take a photo at low-rez and using some special algorithim enlarge it without doing pixelization, does this sort of thing exist for video? Please tell us, give us your thoughts on the matter.
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Old March 4th, 2006, 07:07 AM   #2
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You are talking abou S-Spline. On some pictures that software works very well, on others it doesn't. Anyhow, remember this: the detail isn't there on tape, so you'll never get it! Some algorithms will just make a 'smoother' uprezzed image...
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Old March 4th, 2006, 02:11 PM   #3
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There are several methods for resizing. Aside from spline, bicubic resizing is one of the better approaches for enlarging natural images.
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Old March 4th, 2006, 02:15 PM   #4
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Actually, in theory at least, a series of frames can contain information that can be used to intelligently interpolate more detail into each of the frames. I don't think I've seen it done, but it certainly could be (might take a cray to do it!). That sort of thing would almost fall into the AI category.
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Old March 4th, 2006, 02:20 PM   #5
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I'm sort of hoping to coax my Dad into taking a stab at a sort of AI approach to interpolating detail into the individual frames, by analyzing series of frames. He's a computer scientist from almost as far back as the stone age and studied AI most his life. I doubt he'll ever try to take it on though. He's retired now, in his early 70s.
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Old March 4th, 2006, 02:22 PM   #6
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Another popular application for uprezzing still photos is called Genuine Fractals. As the name implies, it uses fractal based calculations for uprezzing.

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Old March 4th, 2006, 03:46 PM   #7
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Are there any resize filters for Vegas available that use either spline of fractals?
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