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13th January 2006, 20:30 | #1 | Link |
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Dot-Crawl and Rainbowing in a telecined source
Is there any filter that can deal with these artifacts baked into a DVD and telecined? Not just that, but they are on constantly moving parts of the image.
I've tried running various of the popular filters (like guavacomb, etc) after IVTC but they make no difference. The closest I have come to a filter that worked was the VirtualDub DotCrawl Comb filter by Scott Eliott (in Spacial mode), but it lost a lot of detail. Is there anything better? The source in question are the Beast Wars DVDs, if anyone is wondering. |
14th January 2006, 21:11 | #5 | Link |
Huh?
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For dotcrawl remocal, I recommend to use DeDot() before deinterlacing/IVTCing.
For rainbow removal, try BiFrost, but you have to find out what kind of rainbows you're dealing with (the included readme tellls you how to know) in order to know wether to put it before or after IVTCing/Deinterlacing, as putting it in the wrong place renders it useless. Another great rainbow remover is foxyshadis's SmartSSIQ mod. It needs SSIQ. To sum it up, your script would look like this: Code:
BiFrost() <-- if rainbows are Type 1 ConvertToYV12(interlaced=true) DeDot() IVTCing/Deinterlacing Bifrost(interlaced=false) <-- if rainbows are Type 2 SmartSSIQ() <-- Another rainbow remover rest_of_the_filters
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Read Decomb's readmes and tutorials, the IVTC tutorial and the capture guide in order to learn about combing and how to deal with it. |
15th January 2006, 01:12 | #6 | Link |
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DeDot seems to work about as well as tcomb (although without the artifacts that tcomb makes when the image is shaking), but the problem is that they are both temporal filters, and most of the dotcrawl in my source is present in moving details.
The rainbowing I am not as worried about, but it would be great to get rid of the dotcrawl entirely. Unfortunately, no-one seems to know a filter that will do it. |
15th January 2006, 02:43 | #7 | Link |
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A long shot, but you might try to DeRing. One or both together might work.
<a href="http://forum.doom9.org/showthread.php?t=96592&highlight=hqdering">HQDering Script</a>. Requires Deen v1.0 beta 1 and MaskTools v 1.4.16 BlindPP internal filters of DGDecode. This function is explained in the documentation. Both filters are spatial. Good luck to you. [well, my "html code" is off and can't be changed, apparently; sorry for sloppy link.] Last edited by hartford; 15th January 2006 at 02:48. |
15th January 2006, 07:20 | #8 | Link |
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It was a long shot, and I'm sorry to say it didn't work.
I guess this kind of problem doesn't come up all that often, or else someone would have written a good spacial filter for it by now. Scott Eliott's vdub filter just blurs it too much. |
15th January 2006, 10:01 | #9 | Link |
interlace this!
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@ bkman:
sadly, rather than being a problem that doesn't come up often and is thus ignored, rainbowing belongs to that other class of problem that comes up all the time but is intrinsically difficult to deal with. when a picture is static, it can be dealt with pretty well, but when stuff moves the rainbows become unbeatable.
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15th January 2006, 10:21 | #10 | Link | |
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Quote:
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a.k.a. Clouded. Come and help by making sure your favourite AVISynth filters and scripts are listed. |
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15th January 2006, 13:12 | #11 | Link | |
interlace this!
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hmm. i've never tried motion compensation, but i suspect the results will be only slightly better - the crosstalk can only be cancelled because it inverts every field. if the fields were moved about it'd go in and out of phase, so something like DeDot would be of limited effectiveness. the motion engine would have to take the crawls into account and do the compensation such that they cancel out. and of course that would give spoiled motion, which would mean it doesn't filter enough, which leaves you only slightly better than with no compensation at all.
well, that's my gut feeling anyhoo [edit] Quote:
Beast Wars is a bit of a problem child... it was originally made in PAL (some french studio) and several strange edits were made (some scenes look to have been rendered interlaced, then deinterlaced in editing using field-discarding). if you're in NTSC land, you'll have standards-converted versions of this footage, and it's a different edit again. also, the masters are analog. Betacam SP. though it's a component format (i think... hard to tell, but on the monitors i saw no crawls so that'll do me), it's quite possibly been output as composite, then standards-converted to NTSC, then encoded for DVD. if this is the case, you're SOL because the standards-converter probably muddled the rainbowing up enough that no filter can remove it without nuking the chroma. the more agressive De-Rainbowers should help though. and don't worry too much about leaving them in, because for all it's faults, beast wars seems to be pretty compressible. or... you could wait for the R4 release because it'll be slightly better - still a bit noisy, but no standards-conversion and no rainbows. also a fair bit sharper (due to the apparent lack of antialiasing in the original renders). @ clouded: motion compensation works pretty well on beast wars - it's all CG with no motion-blur, but mvflowblur works a treat on it
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sucking the life out of your videos since 2004 Last edited by Mug Funky; 15th January 2006 at 13:22. |
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15th January 2006, 13:46 | #12 | Link | |
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15th January 2006, 15:15 | #13 | Link | |
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I don't know too much about image processing, but couldn't a filter be made to kill crawl based on looking at the high-contrast detail where it is likely to occur, identifying the ladder pattern, and blurring it away? |
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17th January 2006, 03:34 | #14 | Link |
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<i>looking at the high-contrast detail where it is likely to occur, identifying the ladder pattern, and blurring it away?</i>
Well, if you have a few years for processing, I'm sure that could be done (note: why is my html off? and, how do I turn it on? Can't find the switch.) |
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