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17th June 2006, 17:52 | #1 | Link |
Registered User
Join Date: May 2005
Posts: 11
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Dealing with compression-killing interlaced luma variations
So I have the R2 Family Guy Season 3 DVDs. Unlike the first two Seasons, the quality of this is astounding. Not a single blend anywhere, PAL speedup with pitch correction, etc.
However, while the episodes are progressive, they're encoded interlaced. I'm aware that usually this means nothing and it should just be treated as progressive. However when I view it with Histogram(mode="luma"), you can see that there are differences between fields (there's no problem with the chroma for the record). Putting a Bob() afterwards proves this; Bob.SelectEven and Bob.SelectOdd look fine (well, better), but Bob doesn't. M2V sample, 20MB And a sample histogrammed image: I've tried an x264 encode, and this issue seems to kill compression. In addition, I'd like to resize it to 720x540 (to make it square pixel), and a vertical resize is never good for interlacing. So, are there any filters that can solve this? Thanks in advance. Last edited by DrScotsman; 17th June 2006 at 18:06. |
17th June 2006, 19:15 | #2 | Link |
Angel of Night
Join Date: Nov 2004
Location: Tangled in the silks
Posts: 9,559
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Try using a denoiser. frfun7+degrainmedian warms my heart for mild or moderate noise, and a slight sharpening (limitedsharpen or seesaw) to remove the softness it'll cause. If the combing is normally too faint to notice, that'll completely get rid of it, and if not, at least mitigate it.
Or you actually could try resizing, because the variations should be small enough that resizing will mix them back together in an eye-pleasing instead of disruptive way. (Since they're supposed to be together anyway, unlike combing.) But you probably can't resize down far enough to make a noticeable difference, and it'd be best to keep the original DVD resolution. |
17th June 2006, 19:28 | #3 | Link |
Registered User
Join Date: Apr 2002
Location: Germany
Posts: 5,391
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Try the following - it's not the definite solution, but it improves very much on the problem, while impact on actual detail is very little.
BTW, basically this is just good old "Blur(1.0).Sharpen(1.0)" ... but done correctly. Edit 26 Oct '06: Function updated (hopefully all inconsistencies eliminated). Code:
# Vinverse: a small, but effective Function against (residual) combing, by Didée # sstr: strength of contra sharpening # amnt: change no pixel by more than this (default=255: unrestricted) # uv : chroma mode, as in MaskTools: 1=trash chroma, 2=pass chroma through, 3=process chroma function Vinverse(clip clp, float "sstr", int "amnt", int "uv") { uv = default(uv,3) sstr = default(sstr,2.7) amnt = default(amnt,255) uv2 = (uv==2) ? 1 : uv STR = string(sstr) AMN = string(amnt) vblur = clp.mt_Convolution("1","50 99 50",U=uv,V=uv) vblurD = mt_MakeDiff(clp,vblur,U=uv2,V=uv2) Vshrp = mt_LutXY(vblur,vblur.mt_Convolution("1","1 4 6 4 1",U=uv2,V=uv2),expr="x x y - "+STR+" * +",U=uv2,V=uv2) VshrpD = mt_MakeDiff(Vshrp,vblur,U=uv2,V=uv2) VlimD = mt_LutXY(VshrpD,VblurD,expr="x 128 - y 128 - * 0 < x 128 - abs y 128 - abs < x y ? 128 - 0.25 * 128 + x 128 - abs y 128 - abs < x y ? ?",U=uv2,V=uv2) mt_AddDiff(Vblur,VlimD,U=uv,V=uv) (amnt>254) ? last : (amnt==0) ? clp : mt_LutXY(clp,last,expr="x "+AMN+" + y < x "+AMN+" + x "+AMN+" - y > x "+AMN+" - y ? ?",U=uv,V=uv) return(last) }
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- We´re at the beginning of the end of mankind´s childhood - My little flickr gallery. (Yes indeed, I do have hobbies other than digital video!) Last edited by Didée; 26th October 2006 at 13:08. |
17th June 2006, 21:10 | #4 | Link |
AviSynth plugger
Join Date: Nov 2003
Location: Russia
Posts: 2,183
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I remember my first plugin Equlines
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My Avisynth plugins are now at http://avisynth.org.ru and mirror at http://avisynth.nl/users/fizick I usually do not provide a technical support in private messages. |
5th July 2022, 02:45 | #5 | Link | |
Registered User
Join Date: Jan 2015
Posts: 1,056
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Quote:
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I ask unusual questions but always give proper thanks to those who give correct and useful answers. |
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5th July 2022, 11:44 | #7 | Link |
Broadcast Encoder
Join Date: Nov 2013
Location: Royal Borough of Kensington & Chelsea, UK
Posts: 2,912
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Katie, this is Didée we're talking about. He made the history of Doom9 and rest assured his filters still work to this very day.
Me too. We've had some of the very best developers here on Doom9. It's a shame that some of them retired, but I guess it's just the way it works. One of my colleagues also retired and he was like: "please, I'll never stop posting on Doom9 or use Avisynth"... until he did, 1 and a half years later to spend his days catching carps in the river. |
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