MergeFullDiff

std.MergeFullDiff(vnode clipa, vnode clipb)

Merges back the difference in clipb to clipa. Note that the bitdepth of clipb has to be one higher than that of clip. This function is usually used together with MakeFullDiff, which is normally used to calculate the difference.

Unsharp mask:

blur_clip = core.std.Convolution(clip, matrix=[1, 2, 1, 2, 4, 2, 1, 2, 1])
diff_clip = core.std.MakeFullDiff(clip, blur_clip)
sharpened_clip = core.std.MergeFullDiff(clip, diff_clip)