Appeal No. 2002-2064
Application No. 08/902,330
image. A threshold value comparator 2 compares the absolute
value of the detected differential with a predetermined threshold
value, to determine whether the block deformation removing
process be performed at the corresponding block boundary. A
pattern selector 3 randomly selects a value pattern among several
patterns of value to be added to signal values or levels of the
two or more pixels in the vicinity of a block boundary on a
scanning line crossing the block boundary at right angle. A
random number generator 4 generates a pseudo random number which
is applied to the pattern selector 3. The pattern selector 3
uses the random number to randomly select a value pattern among
several patterns. An adder 5 adds additional values selected by
the pattern selector 3 to respective signal values of pixels in
the vicinity of the block boundary when the threshold value
comparator 2 decides that the block deformation removing process
should be performed. See page 6 of Appellant's specification.
Independent claim 1 present in the application is reproduced
as follows:
1. A block deformation removing filter comprising:
a detector responsive to pixel signals included in a
plurality of pixel blocks forming an image to detect a difference
between absolute values of at least two pixel signal intensity
levels in the vicinity of a block boundary of the pixel blocks;
33
Page: Previous 1 2 3 4 5 6 7 8 9 Next
Last modified: November 3, 2007