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10th March 2014, 12:39 | #1 | Link |
Registered User
Join Date: Mar 2014
Posts: 2
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Informations about HorizontalReduceBy2 filter
Hi everybody,
I a mtrying to make a 3D Half Side-by-side video using avisynth. I have two AVI sources (1080p) and I use the filter "HorizontalReduceBy2" in order to have two 960x1080 videos, and then I will stack them. I would like to know how this filter works exactly. Does this filter take one filter over two ? The informations I have on the wiki don't help me a lot (I don't understand how the filter kernel (1/4,1/2,1/4) is used). Moreover, is this filter a good solution for a 3D (anaglyphe) visualisation ? Thank you for your consideration ^^ |
10th March 2014, 17:20 | #2 | Link | |
Formerly davidh*****
Join Date: Jan 2004
Posts: 2,496
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Quote:
Code:
ABCDEFGH a b c d a=1/4A+1/2A+1/4B (as we are at the edge, A gets counted twice) b=1/4B+1/2C+1/4D c=1/4D+1/2E+1/4F d=1/4F+1/2G+1/2H In this way, all of the original pixels are equally represented (at half weight) in the output - either in a single pixel, or spread across two neighbouring pixels. David |
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