Tuesday, June 1, 2010

At last, a name for that "curved stretch" HD view

I've always wanted to know the name of that weird "curved stretch" HD view that I've seen on the Food Network and Travel Channel - namely so that I can find an AviSynth script that can replicate it or undo it.

This article used the words "nonlinear stretch mode" which led me to these threads (1, 2) and this Wikipedia article:



SD to Stretch-o-Vision HD: SimpleResize

Stretch-o-Vision HD to SD:

LoadPlugin("C:\Program Files\AviSynth 2.5\plugins\SimpleResize.dll")
directshowsource("video.avi")
WarpedResize(640,480,1.15,0.95)

Thanks, fellow nerds!

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Update: There's another version here made by a different guy, but he states "However, at least my function works in YV12 colorspace!"
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1 comment:

  1. AnonymousSeptember 8, 2011 at 8:02 PM

    For Cartoon Network HD:

    # Deinterlace first!!!
    Levels(5, 1, 248, 0, 255, coring=false) # they screwed up the black levels
    ConvertToYUY2(interlaced=false)
    WarpedResize(last.width,last.height,1.0635,1) # the "5" is just wishful thinking. it will get rounded to 3 decimal places so it's not as precise as I'd like # "last." used for clarity. you could of course omit it
    ConvertToYV12(interlaced=false)
    Spline36Resize(720,460) # only 460 (or perhaps 462, but 460 is nicer) actual horizontal lines of resolution.

    Proper *display* aspect ratio is 640:460 (32:23) (or approx. 720x518).

    Some logic behind the DAR selection, assuming that the common 1.85:1 ratio is involved:
    (4/3)/(1.85)*1920 = 1383.78
    (4/3)/(1.85)*720 = 518.92
    (4/3)/(1.85)*640 = 461.26
    (However, they might've just been lazy and cropped 10px off the top and bottom of the 480i source. Hard to tell.)

    Examples: http://imgur.com/a/D2eQF

    ReplyDelete

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