An image noise reduction method and apparatus to be used to digitize and
process an image signal. Level values of peripheral pixels and the level
value of a watched pixel are input into eight comparators and the value
"1" is output when absolute values of differences between the level
values are smaller than the value of a reference level. Signals output
from the comparators are supplied to four AND circuits. The signals
output from the AND circuits are supplied to eight AND gates in
accordance with each combination and level values of corresponding
peripheral pixels. Signals output from the AND circuits are supplied to
an adder and the value "1" is added to the multiplication value and
output to an output port-4. Thereby, the averaging operation is performed
by using only pixels which solves the problem that an averaged signal
phase is deviated from an original position.