If you are experiencing visual artifacts (ghosting of people, etc.) you
probably want to play around with the dnr settings.

You can use test_ioctl or record-v4l2.pl to set them.

The rest of this document, details the test_ioctl options and is based
off of the e-mail that Arpi sent to the list 06/08/2003 
Subject: "[ivtv-devel] dnr_* codec parameters".


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test-ioctl's help isn't too informative about the
noise filter params:

       dnr_mode     =<#> to be advised (advanced
settings)
       dnr_spatial  =<#> to be advised (advanced
settings)
       dnr_temporal =<#> to be advised (advanced
settings)
       dnr_type     =<#> to be advised (advanced
settings)


He did some experimenting and found the following:

dnr_mode:
	0:  spatial and temporal noise removal filters
        1:  temporal only
        2:  spatial only
        3:  no noise filter

dnr_spatial:
	0..16:  0=no filtering  16=strongest filter
              (horizontal only, smoothing/lowpass)
dnr_temporal:
	0..16:  0=no filtering  16=strongest filter 
              (inter-frame (time dimension), averaging)

if you know mplayer's denoise3d or hqdn3d filter, then
dnr_spatial is the same as its first parameter, and dnr_temporal is the
same as its 3rd param.

if you set dnr_temporal too high (say 16) you'll get
motion blur effect.  if you set dnr_spatial too high, you get image
horizontaly blured.

dnr_type:  dunno, i couldn't find the effect of this
parameter. it doesn't change anything visible for me. any ideas?

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