Appeal No. 2000-2066
Application No. 08/829,471
The claimed invention relates to a method of interpolating an
image signal from original image signal components representing a
plurality of sampling points arrayed at predetermined intervals in
a lattice-like form. A determination is made whether an
interpolation point belongs to an image edge portion in which a
sharp contrast edge is present or belongs to a flat portion in
which a sharp edge is not present. Based on this determination, a
particular interpolation operation process is selected. In the
case where the interpolation point is determined to belong to the
flat portion, an interpolation process is selected with which the
sharpness of the flat portion is rendered variable.
Claim 8 is illustrative of the invention and reads as follows:
8. An interpolating operation method for an image signal,
wherein an interpolated image signal component corresponding to an
interpolation point is calculated from original image signal
components of an original image signal representing an original
image, which represent a plurality of sampling points arrayed at
predetermined intervals and in a lattice-like form, the method
comprising the steps of:
i) making a judgment as to whether the interpolation point
belongs to an image edge portion, at which a change in
the original image signal is sharp, or belongs to a flat
portion, at which the change in the original image signal
is unsharp, and
ii) changing interpolating operation processes, one of which
is to be employed for the interpolation point, over to
each other in accordance with the results of the
judgement; and
2
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