Deoldify Vapoursynth filter

[Dan64]

Hello Selur,

  good news! I found an effective way to stabilize the clip's colors by using the filter AverageFrames.
  Unfortunately I cannot add it in my filter because in not working if called inside a vpy filter.
  So this filter must be managed directly in Hybrid's GUI.

   This filter act as a temporal filter since the average is performed both on past and future frames.
    The type of average can be controlled using the weights, the max number of weights is 31, and must be used a (integer) odd number of weights because it is used a central average.

    It is better add this filter as a post process filter in the "Coloring" page.
    The options to be added are:

    1) Number of frames (integer, max 31)
    2) The type of average: Central Average, Left Average (only past frames), Right Average (only future frames)
    3) Scene Change detection (boolean): if true in the case of change scene detection the future frames are not used

Weight computation:

Given N the number of frames detected [if N%2==0: N+=1, N=min(N,31)]

The lateral weights can be calculated as: Wi=trunc(100/N)
Then the central weight can be calculated as: Wc=100-(N-1)*Wi  

Supposing N=11, we have:

Wi=trunc(100/11)=9
Wc=100-9*10=10.

Example of "Central Average" with 11 frames

clip = core.resize.Bicubic(clip=clip, format=vs.YUV420P10, matrix_s="709", range_s="limited", dither_type="error_diffusion")
clip = core.misc.AverageFrames(clip, [9, 9, 9, 9, 9, 10, 9, 9, 9, 9, 9], scale=100, scenechange = True, planes=[1,2])

Example of "Left Average" with 11 frames

clip = core.resize.Bicubic(clip=clip, format=vs.YUV420P10, matrix_s="709", range_s="limited", dither_type="error_diffusion")
clip = core.misc.AverageFrames(clip, [17, 17, 17, 17, 17, 15, 0, 0, 0, 0, 0], scale=100, scenechange = True, planes=[1,2])

Example of "Right Average" with 11 frames

clip = core.resize.Bicubic(clip=clip, format=vs.YUV420P10, matrix_s="709", range_s="limited", dither_type="error_diffusion")
clip = core.misc.AverageFrames(clip, [0, 0, 0, 0, 0, 15, 7, 17, 17, 17, 17], scale=100, scenechange = True, planes=[1,2])

The Average must be performed on YUV color-space, using only the plans "U","V", because we are interested in stabilize the chroma components.

The attached file VideoTest_small1_DV+DD_AF31C.zip is an example of result obtained using a "Central Average" with 31 frames and scenechange =False, using the code

clip = core.resize.Bicubic(clip=clip, format=vs.YUV420P10, matrix_s="709", range_s="limited", dither_type="error_diffusion")
clip = core.misc.AverageFrames(clip, [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 10, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3], scale=100, scenechange = False, planes=[1,2])

As reference I attached also the file VideoTest_small1_DV+DD.zip that was obtained using the default settings

from vsdeoldify import ddeoldify
clip = ddeoldify(clip=clip)

I hope that you will include this filter Hybrid.

Thanks,
Dan