avfilter/interlace: add complex vertical low-pass filter
This complex (-1 2 6 2 -1) filter slightly less reduces interlace 'twitter' but better retain detail and subjective sharpness impression compared to the linear (1 2 1) filter. Signed-off-by:Thomas Mundt <tmundt75@gmail.com> Signed-off-by:
James Almer <jamrial@gmail.com>
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