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22nd May 2019, 11:19  #1  Link 
HeartlessS Usurer
Join Date: Dec 2009
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Estimate_Nnedi3_Rpow2()
Function to estimate required rFactor for Nnedi3_RPow2() upscale function.
(Purpose is to enable automated decision for rFactor without human intervention.) Code:
# Estimate_Nnedi3_Rpow2.avsi Function Estimate_Nnedi3_Rpow2(clip c,Int OutW,Int OutH, Float "Th",Float "Th2",Bool "Debug") { /* Estimate_Nnedi3_Rpow2() v1.02 (c) StainlessS @ Doom9 : https://forum.doom9.org/showthread.php?t=176437 Requires: RT_Stats if DEBUG==True, else no requirements. Estimate required rfactor for nnedi3_rpow2() based on greatest output dimension. Purpose is to enable automated decision for rFactor without human intervention. We use the term OutDim below where OutDim=Max(OutW,OutH) We use the term InDim below where InDim=(OutW>=OutH) ? c.Width : c.Height We use the term Scale below where Scale = Float(OutDim)/InDim, ie upscaling factor. For any given Scale, we have 2^x <= Scale < 2^(x+1), [ Where x = Int(Log2(Scale)) ]. It is our task to choose and return either 2^x or 2^(x+1) using a threshold as a boundary condition to make that choice. If Scale < 1.0, then we're downscaling and function result will be always be 1, ie DONT use Nnedi_RPow2, just a simple resize. The lower choice power of 2 rfLo = 2^x or Pow(2.0, Int(Log2(Scale))) and the higher choice power of 2, is double that ie 2^(x+1) or rfLo*2.0 or Pow(2.0, Int(Log2(Scale))+1) Where 1.0 <= Scale < 2.0 : rfLo=1 and rfHi=2, and we use Th threshold for the boundary condition, if Scale >= Th, then will choose rfHi [ie 2] and rfLo[ie 1] if not. NOTE, even when Scale=1.0 (no resizing at all), can force rFactor of 2.0 by setting Th to 1.0 (who knows why you might want that). Where 2.0 <= Scale < 4.0 : rfLo=2 and rfHi=4, and we use Th2 threshold to make choice, NOTE Th2 not Th. Can eg use Th to set lowest boundary condition for using Nnedi3_RPow2 processing, and use Th2 for other higher upscale decision ranges. Higher upscale decision ranges work the same as this 2.0 > 4.0 upscale decision range, eg 4.0>8.0, and 8.0>16 etc, and all use Th2 for boundary condition. Estimate_Nnedi3_Rpow2(clip c, Int OutW, Int OutH, Float "Th"=Sqrt(2.0), Float "Th2"=Th, Bool "Debug"=False) Returns Int, 1(dont use nnedi3_rpow2), or rFactor of 2^(1>10). Args: c, Input clip, used to obtain input frame size. OutW, Target resize clip Width. OutH, Target resize clip Height. Th, Default SqRt(2.0) [~1.4142] (range 1.0 <= Th <= 2.0), SWITCH_ON Nnedi3_Rpow2 processing threshold, used when Scale < 2.0. A Th of 1.0, would always select the higher rfHi 2^(x+1). A Th of 2.0, would Never select the higher rFactor (always the lower rfactor for 2^x, who knows why you might want that). A Th of eg 1.5, will set the boundary midway between 2^x and 2^(x+1). Default Th=SqRt(2.0), Assuming both dimensions equally scaled and upscaling between 1.0 and 2.0 times, then SqRt(2.0) threshold is broken when Input clip is to be doubled in Area. Th2, Default Th, (range 1.0 <= Th2 <= 2.0), additional threshold to choose rFactor, used if at least doubling target size (where Th not used). Works exactly the same as Th threshold, only used where Scale >= 2.0. If you for whatever reason want to set Th2 lower than Th, eg Th2 midway between 1.0 and Th, can use Th2 = Int(Th)+Frac(Th)/2.0 [Int(Th) always 1, so same as 1+Frac(Th)/2.0] or (Th+1.0)/2.0. Th2 can be either higher than Th or lower, your choice, but lower might sometimes be the more obvious choice. If Th2 == Th, THEN Eg, InDim=100, Th=Th2=1.5(150%), rF = (OutDim>=150) ? 2 : 1 Breaks thresh at 150% of (InDim*1) rF = (OutDim>=300) ? 4 : 2 Breaks thresh at 150% of (InDim*2) rF = (OutDim>=600) ? 8 : 4 Breaks thresh at 150% of (InDim*4) rF = (OutDim>=1200) ? 16 : 8 Breaks thresh at 150% of (InDim*8) Eg, InDim=100, Th=Th2=1.1(110%), rf = (Outdim>=110) ? 2 : 1 Breaks thresh at 110% of (InDim*1) rf = (Outdim>=220) ? 4 : 2 Breaks thresh at 110% of (InDim*2) rf = (Outdim>=440) ? 8 : 4 Breaks thresh at 110% of (InDim*4) rf = (Outdim>=880) ? 16 : 8 Breaks thresh at 110% of (InDim*8) Else if Th2 != Th THEN: Eg, InDim=100, Th=1.5(150%), Th2=1.25(125%) rf = (Outdim>=150) ? 2 : 1 Breaks thresh at 150% of (InDim*1) Not doubling size, Using Th(150%) rf = (Outdim>=250) ? 4 : 2 Breaks thresh at 125% of (InDim*2) Using Th2(125%) rf = (Outdim>=500) ? 8 : 4 Breaks thresh at 125% of (InDim*4) Using Th2(125%) rf = (Outdim>=1000) ? 16 : 8 Breaks thresh at 125% of (InDim*8) Using Th2(125%) Eg, InDim=100, Th=1.1(110%), Th2=1.05(105%) rf = (Outdim>=110) ? 2 : 1 Breaks thresh at 110% of (InDim*1) Not doubling size, Using Th(110%) rf = (Outdim>=210) ? 4 : 2 Breaks thresh at 105% of (InDim*2) Using Th2(105%) rf = (Outdim>=420) ? 8 : 4 Breaks thresh at 105% of (InDim*4) Using Th2(105%) rf = (Outdim>=840) ? 16 : 8 Breaks thresh at 105% of (InDim*8) Using Th2(105%) End if Debug, Default False. When true return Messageclip with some debug info, else return Int rFactor result. Example: BlankClip(width=100,height=100) Th=1.5 Th2=Th Return Estimate_nnedi3_rpow2(100,600,Th,Th2=Th2,Debug=TRUE) */ Function Log2(Float n) { return Log(n)/Log(2.0) } # Log to base 2 Function InvLog2(Float n) { return Pow(2.0,n) } # Inverse myName = "Estimate_Nnedi3_Rpow2: " Th=Default(Th,Sqrt(2.0)) Th2=Default(Th2,Th) Debug=Default(Debug,False) Assert(1.0 <= Th <= 2.0,myName+String(Th, "1.0 <= Th(%f) <= 2.0")) Assert(1.0 <= Th2 <= 2.0,myName+String(Th2,"1.0 <= Th2(%f) <= 2.0")) InDim = (OutW>=OutH) ? c.Width : c.Height Scale = (OutW>=OutH) ? OutW/c.Width.Float : OutH/c.Height.Float # Based on greatest OUTPUT dimension ScaleLg2 = Log2(Scale) # Scale to Log Base 2 x_Lo = Min(ScaleLg2.Int,10) # x : Limited to Nnedi3_Rpow2 Max of 10 = upscale * 1024 x_Hi = Min((Scale<1?x_Lo:x_Lo+1),10) # x+1 : limit Rf to 1024 as above. If Scale < 1.0 lock to always return rFactor=1. rfLo = InvLog2(x_Lo).Round # 2^x : Lower Rf, Int rfHi = InvLog2(x_Hi).Round # 2^(x+1) : Hier Rf, Int UseTh2 = (x_Lo>0) # Use Th2 if at least doubling target size, Else using Th. lim = (UseTh2) ? rfLo*Th2 : rFlo*Th # Boundary, Upsize scaling factor has to be at least this to choose higher power of 2. RF = Max((Scale >= Lim ? rfHi : rfLo),1) # Choose rFactor, 2^(x+1) or 2^x : Minimum of 1. return (!Debug) \ ? RF \ : MessageClip(RT_String("%s\nTh=%f : Th2=%f : Scale=%f : UseTh2=%.1s\nx_Lo=%d : x_Hi=%d : rFlo=%d : rFhi=%d : Lim=%f : LimDim=%.2f\nRF=%d", \ myName,Th,Th2,Scale,UseTh2,x_Lo,x_Hi,rfLo,rfHi,Lim,InDim*Lim,RF)) } Code:
BlankClip(width=100,height=100) Th=1.5 Th2=Th Estimate_nnedi3_rpow2(100,600,Th,Th2=Th2,Debug=TRUE) Return Last EDIT: Looks like Nnedi3_Resize16 script does something similarish: http://avisynth.nl/index.php/Nnedi3_...io_Calculation
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I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? Last edited by StainlessS; 29th May 2019 at 16:17. Reason: Update docs 
22nd May 2019, 12:45  #2  Link 
HeartlessS Usurer
Join Date: Dec 2009
Location: Over the rainbow
Posts: 7,209

Rough usage
Code:
ColorBars(Width=400,Height=400,Pixel_type="YV12") InW=Width InH=Height SCALE = 3.3 TH = 1.5 TH2 = TH TAPS = 5 RND = 4 # Rounding to multiple of RND OutW = (InW * SCALE + RND1).Int / RND * RND # Round UP OutH = (InH * SCALE + RND1).Int / RND * RND # Round UP #OutW = (InW * SCALE + RND/2).Int / RND * RND # Round Nearest #OutH = (InH * SCALE + RND/2).Int / RND * RND # Round Nearest rFactor=Last.Estimate_Nnedi3_Rpow2(OutW,OutH,th=TH,th2=TH2) (rFactor>1) \ ? nnedi3_rpow2(rfactor=rfactor,cshift="LanczosResize",fwidth=OutW,fheight=OutH,ep0=TAPS) \ : LanczosResize(OutW, OUTH, src_left=0.5, src_top=0.5, taps=TAPS) S=String(InW,"InW=%.0f")+String(InH," : InH=%.0f")+String(OutW,"\nOutW=%.0f")+String(OutH," : OutH=%.0f")+String(rFactor,"\nrFactor=%.0f\n") + ((rFactor>1) ? "Using RPOW2" : "Not Using RPOW2") Return Subtitle(S,Size=Height/16.0,lsp=0)
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I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? Last edited by StainlessS; 24th May 2019 at 01:20. Reason: Small update 
22nd May 2019, 16:47  #3  Link 
HeartlessS Usurer
Join Date: Dec 2009
Location: Over the rainbow
Posts: 7,209

Update to v1.01, Added LimDim (dimension that will break Threshold) to Debug Output. Updated first post debug mode image.
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I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? 
24th May 2019, 01:24  #4  Link 
HeartlessS Usurer
Join Date: Dec 2009
Location: Over the rainbow
Posts: 7,209

v1.02, posts #1 and #2 updated.
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I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? 
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