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8th March 2005, 03:18 | #2 | Link |
budala
Join Date: Oct 2003
Location: U.S.
Posts: 545
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Depends on the context. For deinterlacing I believe these mean the same thing. For resizing, they would not. Lanczos would be interpolation, bilinear would be blend.
BTW: Interpolate usually means calculating a new pixel value between and by using other pixels. If certain conditions are met, the calculation can be rather accurate. The secret is that the surounding pixels are not evenly weighted (not a simple average), and many are used. "A simple average" i would take as the general meaning of blend. Unfortunately, for deinterlacing, there is not enough information to do a proper interpolation. AKA the frame rate is too low. For deinterlacing ... other math magic has to me used. Like motion compensation. At least that's my take .. |
8th March 2005, 05:45 | #4 | Link |
mad computer-scientist
Join Date: Mar 2002
Posts: 1,375
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AFAIK(!):
blending means taking 2 or more pixels (or other sources) and combine them (for example by averaging) interpolating means that you take 2 sources a and c and reconstruct b from them (trying to get d would be extrapolating) so depending on the context it should be the same |
8th March 2005, 05:46 | #5 | Link |
Registered User
Join Date: Mar 2004
Posts: 247
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Another question
To avoid making a new thread...
What is this called, and how can I get rid of it? http://whitevoid.myvnc.com/stuff/this.JPG The left picture is the source, unmodified. After trying a bunch of plugins and scripts, I always end up getting something like the right picture. At first, I thought it was blending, but now I'm not so sure, since I can't seem to get rid of it no matter what I do... You can imagine what the previous/next frames are. Anyway, I'd like to make/use a script/plugin that chooses either the previous or the next frame, instead of having to use a combination of both. Is that possible? jellysandwich |
8th March 2005, 07:12 | #7 | Link |
Registered User
Join Date: Jan 2002
Location: France
Posts: 2,856
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Blending and interpolating are totally different in the context of deinterlacing :
- blending : you merge both fields together ( hence it's a very basic kind of spatio temporal interpolation ). You will likely end up with ghosts on fast action scenes. - interpolation : you discard one field and reconstruct it with the other, spatially ( so only spatial interpolation ). No ghosts ( except of course if the source has got blended fields, but that's another matter ), but less details too. |
9th March 2005, 00:31 | #8 | Link | |
Registered User
Join Date: Mar 2004
Posts: 247
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Quote:
So, let me rephrase my previous question then... Is there a way of getting rid of those blended fields by using the next/previous unblended fields? Manao, thanks, your explanation helped a lot. jellysandwich |
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