Appeal No. 96-1628
Application No. 08/167,617
negative offset to those signals)." In the specification
(page 11), appellant states
The effect of the programmable attenuator 48 is,
therefore, to apply a negative pedestal to a range
of intensity values for the image signals within the
areas specified by the threshold detector 46 to step
down or shift that range of intensity values by a
selected amount determined by control signals.
(underlining added for emphasis.)
Accordingly, claim 1 requires reducing by a constant amount
the voltage level of the video image signals that correspond
to intensities above a threshold.
Appellant contends (Brief, page 8) that
Asao does not reduce the voltage level of those
areas which receive light intensities that exceed a
predetermined intensity, with such reduction being
equivalent to applying a negative offset to those
areas . . . Asao reduces the lower intensity regions
by a smaller amount than the higher intensity
regions utilizing "reverse-light conditions."
and (Brief, page 9) that "[t]he combination of identifying
those
areas that exceed a predetermined intensity and reducing the
intensities of those areas by a constant amount (i.e., a
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