AWarpsharp2/aWarp4

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(Created page with "== aWarp4 == {{Template:FuncDef|aWarp4(edge_mask_clip, int "depth", int "chroma")}}")
 
(small documentation update)
 
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== aWarp4 ==
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{{FilterCat4|External_filters|Plugin_functions|Adjustment_filters|Sharpeners}}
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<tt>aWarp4</tt> is designed for an even more custom warp-sharpening than <tt>[[AWarpsharp2/aWarp|aWarp]]</tt> allows. Unlike aWarp, this uses a 4x larger source clip than the edge mask. This is useful for improving the quality of the subpixel interpolation quality in the final step. [[Supersampling]] allows to produce a sharper result with lower {{Template:FuncDef3|depth}}, which equals to less deformations.
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<br>
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<br>
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== [[Script variables|Syntax and Parameters]] ==
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:{{Template:FuncDef|aWarp4 (''clip'', ''clip'', ''int'' "depth", ''int'' "chroma")}}
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<br>
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::{{Par2| |clip| |}}
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:::Input clip; must be exactly 4 times the width and height of the edge mask clip. The 4x upsampled clip should always be top-left aligned, take a look at the examples below.
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<br>
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::{{Par2| |clip| |}}
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:::Edge mask clip; usually the input clip  processed by <tt>[[AWarpsharp2/aSobel|aSobel]]</tt> and followed by <tt>[[AWarpsharp2/aBlur|aBlur]]</tt>.
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:::If you want more stable results it's a good idea to do anti-aliasing and temporal filtering (if necessary) on the edge mask before passing it to the warping stage.
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<br>
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::{{Par2|depth|int|3}}
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:::Strength of the final warping. Negative values result in warping in opposite direction, i.e. will blur the image instead of sharpening.
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:::Range: -128 to 127
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:::<span style="color:red">'''Note:'''</span> Chroma channels are internally processed with <code>{{Template:FuncDef|depth}}/2</code>.
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<br>
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::{{Par2|chroma|int|4}}
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:::Processing mode for the chroma channels (U and V):
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:::* 0 : fill with 0x80(128), output is grayscale.
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:::* 1 : don't care - chroma will be trashed.
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:::* 2 : copy chroma channels from the input clip.
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:::* 3 : process chroma; create an edge mask from each chroma channel and use those to warp each chroma channel individually.
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:::* 4 : process chroma; use the edge mask from the luma to warp the chroma channels.
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:::* 5 : same as 3, but don't process luma.
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:::* 6 : same as 4, but don't process luma.
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:::Luma plane (Y) is always processed, except for mode 5 and 6 which simply copy the luma channel from the input clip.
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<br>
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== Examples ==
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Correct usage examples[http://forum.doom9.org/showpost.php?p=1567371&postcount=67]:<br>
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<br>
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*Using [[Resize|Spline36Resize]] to upscale:
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input    = [[AviSource]]("Blah.avi")
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input4x  = input.Spline36Resize(width*4, height*4, src_left=0.375, src_top=0.375)
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edge_mask = input.aSobel(thresh=128, chroma=1).aBlur(blur=3, type=1, chroma=1)<br>
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aWarp4(input4x, edge_mask, depth=3, chroma=4)
  
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{{Template:FuncDef|aWarp4(edge_mask_clip, int "depth", int "chroma")}}
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<br>
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The following example is written differently but is identical to the one above.
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[[AviSource]]("Blah.avi")
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aWarp4(Spline36Resize(width*4, height*4, 0.375, 0.375), aSobel().aBlur())
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<br>
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*Using [[nnedi3/nnedi3_rpow2|nnedi3_rpow2]] and [[Resize|Spline36Resize]] to upscale:
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input    = [[AviSource]]("Blah.avi")
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input4x  = input.nnedi3_rpow2(rfactor=2).Spline36Resize(width*4, height*4, 0.25, 0.25)
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edge_mask = input.aSobel().aBlur()<br>
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aWarp4(input4x, edge_mask)
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<br>
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*Using [[nnedi3/nnedi3_rpow2|nnedi3_rpow2]] to upscale:
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input    = [[AviSource]]("Blah.avi")
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input4x  = input.nnedi3_rpow2(rfactor=2).nnedi3_rpow2(rfactor=2)
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edge_mask = input.aSobel().aBlur()<br>
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aWarp4(input4x, edge_mask, depth=2)
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<br>
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*The 4x upsampled clip should always be top-left aligned, so <code>Spline36Resize(width*4, height*4)</code> or <code>nnedi3_rpow2(rfactor=4)</code> '''will not''' produce correct results.
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<br>
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--------------------------------------------------------
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'''Back to [[aWarpSharp2#Filters|aWarpSharp2]] &larr;'''

Latest revision as of 00:55, 10 November 2015

aWarp4 is designed for an even more custom warp-sharpening than aWarp allows. Unlike aWarp, this uses a 4x larger source clip than the edge mask. This is useful for improving the quality of the subpixel interpolation quality in the final step. Supersampling allows to produce a sharper result with lower depth, which equals to less deformations.

[edit] Syntax and Parameters

aWarp4 (clip, clip, int "depth", int "chroma")


clip   =
Input clip; must be exactly 4 times the width and height of the edge mask clip. The 4x upsampled clip should always be top-left aligned, take a look at the examples below.


clip   =
Edge mask clip; usually the input clip processed by aSobel and followed by aBlur.
If you want more stable results it's a good idea to do anti-aliasing and temporal filtering (if necessary) on the edge mask before passing it to the warping stage.


int  depth = 3
Strength of the final warping. Negative values result in warping in opposite direction, i.e. will blur the image instead of sharpening.
Range: -128 to 127
Note: Chroma channels are internally processed with depth/2.


int  chroma = 4
Processing mode for the chroma channels (U and V):
  • 0 : fill with 0x80(128), output is grayscale.
  • 1 : don't care - chroma will be trashed.
  • 2 : copy chroma channels from the input clip.
  • 3 : process chroma; create an edge mask from each chroma channel and use those to warp each chroma channel individually.
  • 4 : process chroma; use the edge mask from the luma to warp the chroma channels.
  • 5 : same as 3, but don't process luma.
  • 6 : same as 4, but don't process luma.
Luma plane (Y) is always processed, except for mode 5 and 6 which simply copy the luma channel from the input clip.


[edit] Examples

Correct usage examples[1]:

input     = AviSource("Blah.avi")
input4x   = input.Spline36Resize(width*4, height*4, src_left=0.375, src_top=0.375)
edge_mask = input.aSobel(thresh=128, chroma=1).aBlur(blur=3, type=1, chroma=1)

aWarp4(input4x, edge_mask, depth=3, chroma=4)


The following example is written differently but is identical to the one above. 

AviSource("Blah.avi")
aWarp4(Spline36Resize(width*4, height*4, 0.375, 0.375), aSobel().aBlur())



input     = AviSource("Blah.avi")
input4x   = input.nnedi3_rpow2(rfactor=2).Spline36Resize(width*4, height*4, 0.25, 0.25)
edge_mask = input.aSobel().aBlur()

aWarp4(input4x, edge_mask)



input     = AviSource("Blah.avi")
input4x   = input.nnedi3_rpow2(rfactor=2).nnedi3_rpow2(rfactor=2)
edge_mask = input.aSobel().aBlur()

aWarp4(input4x, edge_mask, depth=2)


  • The 4x upsampled clip should always be top-left aligned, so Spline36Resize(width*4, height*4) or nnedi3_rpow2(rfactor=4) will not produce correct results.


Back to aWarpSharp2 ←

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