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Old 21st November 2018, 19:26   #1  |  Link
HappyLee
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Why isn't there a GeneralConvolution filter on YV12 or Y8?

Hi. I'm applying a 5×5 matrix convolution on the Y plane of an YV12 video, but I have trouble finding the perfect filter that does this very simple task.

GeneralConvolution can do what I want, but it only works on an RGB32 clip, so I have to use:
ConverttoY8(matrix="PC.601").ConverttoRGB32(matrix="PC.601").GeneralConvolution(matrix="...").ConverttoY8(matrix="PC.601")
I find it a waste of CPU time and memory, since it calculates R, G & B planes while I only need it to calculate the Y plane.

mt_convolution from MaskTools2 seems like a better solution for YV12 convolution, but it doesn't seem to support a fully customized matrix. It only supports Horizontal × Vertical and I can't apply my full 5×5 matrix like I can with GeneralConvolution.

So I can't help but asking, since convolution is so important, why isn't there a convolution filter that works on YV12 or Y8 like mt_convolution but supports a full matrix like GeneralConvolution? Thanks.
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Old 21st November 2018, 23:36   #2  |  Link
Emulgator
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Because these calculations only work in 4:4:4, i.e. same full resolution for every component, no subsampled input data ?
Of cours it would be possible to integrate an input resampler.
But then the convolution would inherit and analyse the resizer kernel's frequency patterns and this is what you want to avoid.
That damage has to be done externally with the user knowing its/his reasons.
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Last edited by Emulgator; 21st November 2018 at 23:42.
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Old 22nd November 2018, 00:58   #3  |  Link
poisondeathray
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you can specify the affected plane(s) with vapoursynth's convolution , maybe someone could port it to avisynth
http://www.vapoursynth.com/doc/funct...nvolution.html
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Old 22nd November 2018, 19:23   #4  |  Link
pinterf
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Thanks for the idea, GeneralConvolution in Avisynth+ was not touched at all, now I realized that and updated it (they will appear in the next release)

- Allow 7x7 and 9x9 matrices (was: 3x3 and 5x5)
- All 8-32 bit formats (was: RGB32 only): YUY2 is converted to/from YV16, RGB24/32/48/64 are treated as planar RGB internally
Since 32 bit float input is now possible, matrix elements and bias parameter now are of float type.
When the clip is 8-16 bits, paarameters are converted to integer before use.
- Allow chroma subsampled formats to have their luma _or_ chroma processed. E.g. set chroma=false for a YV12 input.
- New parameters: boolean luma (true), boolean chroma(true), boolean alpha(true)
Default: process all planes. For RGB: luma and chroma parameters are ignored.
Unprocessed planes are copied. Using alpha=false makes RGB32 processing faster, usually A channel is not needed.
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Old 22nd November 2018, 20:32   #5  |  Link
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Beautiful ! Many Thanks and "douze points" go to Hungary.
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