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11th September 2002, 08:49 | #22 | Link |
Vlad, the Buffy slayer
Join Date: Oct 2001
Location: France
Posts: 445
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Have somebody compared the quality of the filter compiled by Nic and the modified avisynth I posted ????
Because my implementation is maybe too simple and has maybe quality problem I'll have no time to do this, I'll be away from keyboard for the next two days (working at a customer office).
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Vlad59 Convolution3D for avisynth 2.0X : http://www.hellninjacommando.com/con3d Convolution3D for avisynth 2.5 : http://www.hellninjacommando.com/con3d/beta |
11th September 2002, 09:58 | #24 | Link | |
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Quote:
I actually use bicubic (b=0,c=0.5), good compromise between quality and compressibility (noise sensitivity). Avised results of LanczosResize are very hopeful for me (much better compressibility)! LanczosResize are my futurefavourite resampling function? I must testing... |
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11th September 2002, 11:03 | #25 | Link | ||
Xe-Rotaredom
Join Date: Oct 2001
Location: Croatia
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Re: another resize algorithms
Quote:
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Cheers, Mijo.
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"Only those who attempt the absurd achieve the impossible." |
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11th September 2002, 11:23 | #26 | Link |
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hi,
here it's a picture with the most common resize algorythm, it was a snap of a picturesoft and un happuly there is not the bicubic picture and the Hanning Sinc. PS: Nearest Neighbourhood formula was call too Box and the Triangle Filter was call Bilinear. (normaly i was not wrong ) Here was the snap :
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AutoDub v1.8 : Divx3/4/5 & Xvid Video codec and .OGG/.MP3/.AC3/.WMA audio codec. AutoRV10 v1.0 : Use RealVideo 10 Codec and support 2 Audio Streams and Subtitles. |
11th September 2002, 12:59 | #27 | Link |
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Do not be much sure about Lanczos3 compressibility (to be honest I was sceptical from the first view: this algo is damn detailed ), I have made a little discouraging test with 1 minute LOTR clip (720x424) resized to 640x272:
neutral bicubic (c=0.75) resize 19000 Kb lanczos3 resize 20200 Kb Just to describe the content, the clip contains progressive moving parts, moving parts and statical. Content is clear and much detailed itself, entirely taken from daylight scene (LOTR frames from 11481 to 13056). (avisynth 2.05, mpeg2dec2.dll, Virtualdub fast-repack YUV, XviD) |
11th September 2002, 13:15 | #28 | Link | |
retired
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Quote:
I had very similar results here too, with some short tests. First 3746 frames of Matrix, mostly dark content, with both motion and still scenes, resized to 640*272. I used vlad59's dll. alanczos3 = 49750 kb sharp (c=0.75) = 49216 kb neutral (c=0.5) = 47546 kb soft (c=0.33) = 46460 kb SimpleResize = 45956 kb bilinear = 41918 kb (avisynth 2.05 with alanczos3 resize dll by vlad59, mpeg2dec.dll, VirtualDub fast recompress, XviD Nic's latest build with constant quant 2) regards, iago EDIT: and using MPEG quantization... Last edited by iago; 11th September 2002 at 13:35. |
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11th September 2002, 13:24 | #29 | Link |
Vlad, the Buffy slayer
Join Date: Oct 2001
Location: France
Posts: 445
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@iago
Can you try with the dll compiled by Nic. To be sure the results are roughly the same. Thanks in advance
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Vlad59 Convolution3D for avisynth 2.0X : http://www.hellninjacommando.com/con3d Convolution3D for avisynth 2.5 : http://www.hellninjacommando.com/con3d/beta |
11th September 2002, 13:31 | #30 | Link | |
retired
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Quote:
Sure, I'll do that right away and post back the results. regards, iago |
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11th September 2002, 13:42 | #31 | Link | |
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Quote:
To mention that Nic's version is only a bit slower than bicubic, almost how happens in my system... (~24fps / ~27fps) [Edit] I have used fixed quantizer 3 for that test. Last edited by unplugged; 11th September 2002 at 13:47. |
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11th September 2002, 13:49 | #32 | Link |
Vlad, the Buffy slayer
Join Date: Oct 2001
Location: France
Posts: 445
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In fact I'm not sure of how works Nic DLL because I found some sources of an Lanczos3 aviutl plugin where you can use to process integer (with MMX) or use float (with SSE or SSE2).
So his version could be more precise (in term of quality) as I use the main resizing engine of avisynth wich deal mainly with integer (except for the resampling pattern of course).
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Vlad59 Convolution3D for avisynth 2.0X : http://www.hellninjacommando.com/con3d Convolution3D for avisynth 2.5 : http://www.hellninjacommando.com/con3d/beta |
11th September 2002, 14:28 | #36 | Link | |
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Wonders not exist... |
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11th September 2002, 15:01 | #38 | Link |
Vlad, the Buffy slayer
Join Date: Oct 2001
Location: France
Posts: 445
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Yes I remember the problem and I don't think Tom solved it (As far as I remember).
[off topic]Time to go, or I'll miss my train[/off topic]
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Vlad59 Convolution3D for avisynth 2.0X : http://www.hellninjacommando.com/con3d Convolution3D for avisynth 2.5 : http://www.hellninjacommando.com/con3d/beta |
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