A filter device includes a vertical NR process portion, a vertical
resolution conversion portion and a vertical NR process decision portion.
The vertical NR process portion receives a horizontal NR processed signal
and produces an NR processed signal. The vertical resolution conversion
portion includes a plurality of resolution conversion filters and uses
the NR processed signal to perform a vertical resolution conversion. The
vertical NR process decision portion decides whether or not the vertical
NR process portion should perform the vertical NR process on the
horizontal NR processed signal in accordance with a resolution conversion
filter selection signal for selecting one of plurality of resolution
conversion filters for the vertical resolution conversion portion.