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| David.Bucci |
| Posted: Jan 15 2003, 05:54 AM |
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Unregistered
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I'm trying to get smart on deinterlacing, and in all the posts and web sites i'm reading, i haven't come across this answer, at least not explicitly enough for me to be sure ...
What does deinterlacing actually do to the nature of the video ... does it simply change the fields so then when they are played back the interlacing effects are removed/reduced, or does it fundamentally change the video from field-based to frame-based?
If it does the latter, are there any "interlace" filters, that would restore the vid to field-based in a high quality fashion? Or (and this is what I'm inferring from what i've read), are many formats incompatible with field-based ... e.g., mpeg1/2, Divx as an MPEG4 implementation, do these formats only do frame-based?
The context for this question has to do with trying to get good quality out of an old LCD projector that won't accept direct VGA input (only takes scan-converted) ... I've been advised to leave video as interlaced. But I was also told that in converting to Divx (to take advantage of the great compression) you should deinterlace before projecting. And I also want to be able to play portions of video clips I get from the web etc., and these typically are already e.g. Divx 5.02.
I know i'm probably misunderstanding something fundamental, but ... if you don't ask  |
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| ChristianHJW |
| Posted: Jan 15 2003, 06:08 AM |
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Advanced Member
Group: Moderators
Posts: 1768
Member No.: 2
Joined: 7-July 02
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Doom9's IVTC Guide is excellent ... http://doom9.org/ivtc-tut.htm , http://doom9.org/index.html?/mpg/tmpg-ivtc.htm
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| minion |
| Posted: Jan 18 2003, 11:41 PM |
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Advanced Member
Group: Members
Posts: 508
Member No.: 1027
Joined: 26-November 02
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All the De-Interlace Filter does is Basicly Blend the Fields together so you Don"t notice the Interlace artifacts But it does NOT Change the Interlaced Frame to a Progressive Frame..It just disguises the The fields so you don"t notice the seperate fields...I use it all the Time Cuz Regular Interlaced video allways looks Bad on My NTSC TV...Wierd But true.... |
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| Morsa |
| Posted: Jan 19 2003, 02:56 AM |
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Moderator of the Vdub support board
Group: Moderators
Posts: 640
Member No.: 246
Joined: 9-September 02
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It is not always true.
One method is to blend fields, other is to discard one field and make an interpolation.There are many others too. |
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