Deoldify Vapoursynth filter

[Dan64]

Hello Selur,

  I do agree with you that moving inside vsdeoldify the grain/noise removal it will be possible to use a more "bold" approach.
  I opted for writing the following degrain function:

def vs_degrain(clip: vs.VideoNode = None, strength: int = 0) -> vs.VideoNode:
   
    if strength == 0:
        return clip
    else:
        import havsfunc
   
    match strength:
        case 1:      
          dstr = 1.0
        case 2:
          dstr = 1.5
        case 3:
          dstr = 2.5
        case 4:
          dstr = 3.5
        case _:
            raise vs.Error("ddeoldify: not supported strength value: " + mode)     
   
    clip = clip.resize.Bicubic(format=vs.YUV444PS, matrix_s="709", range_s="full")  
    clip = havsfunc.KNLMeansCL(clip=clip, d=1, a=2, s=4, h=dstr, device_type="gpu", device_id=0)
    clip = clip.resize.Bicubic(format=vs.RGB24, matrix_in_s="709", range_s="full", dither_type="error_diffusion")
   
    return clip

 
 I decided to use KNLMeansCL because it is fast and can remove both grain and noise. I simplified the input and to the functions ddeoldify_main() and ddeoldify() I added only 1 parameter, that control the strenght of grain/noise removal, called "degrain_strength" (if = 0, is disabled).

  I attached the new RC7.

Thanks,
Dan