Appeal No. 2002-2064
Application No. 08/902,330
1B after filtering. See page 1 of Appellant's specification. As
shown in figure 1B, possible differentials in the intensity level
at the block boundary are smoothed by way of the prior art's low-
pass filter, thereby taking the straight edge off the intensity
value, resulting in a minimized block deformation. However, the
process of block deformation removal by way of the prior art's
low-pass filter also removes a necessary high frequency signal
component of an original image other than the block deformation.
Thus, the prior art's low pass filter causes a blurred image.
See page 2 of Appellant's specification. Appellant's invention
is to solve this problem so as to provide a block deformation
removing filter that can not only remove the block deformation
without affecting the high frequency signal component in the
original image, but also successfully remove even block
deformation with very small differential value of the signal in
the block boundary. See pages 2 and 3 of Appellant's
specification.
Figure 2 is a block diagram showing an embodiment of the
block deformation removing filter according to the present
invention. See page 5 of Appellant's specification. A block
boundary differential detector 1 detects a differential of signal
values (e.g., intensity signal levels) at a block boundary in an
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Last modified: November 3, 2007