Appeal No. 95-5109
Application No. 08/063,665
first embodiment (Figure 7), a horizontal line peak hold
circuit 4a and a vertical peak hold circuit 4c in the
detecting unit 4' are separated by an averaging circuit 4b
which provides sequential rolling averages of the maximum
value outputs from the horizontal line peak hold circuit 4a
(specification, pages 12 and 13). The vertical peak hold
circuit 4c generates a maximum value SC on the basis of the
rolling average values from the averaging circuit 4b, and the
maximum value output SC from vertical peak hold circuit 4c is
used as the auto-focus measurement value EST (specification,
pages 13 and 14). In a second embodiment (Figure 9), the
output from a horizontal line peak hold circuit 4a inputs a
combined low-pass filter and vertical peak hold circuit 4d
(Figures 9 and 10). The low-pass filter portion 43 of circuit
4d performs low-pass filtering on the output from horizontal
line peak hold circuit 4a, and then passes the filtered
maximum values to the vertical peak hold portion 44 of circuit
4d (specifi-
cation, pages 15 through 17).
Claim 1 reads on the first embodiment, claim 2 reads on
the second embodiment, and claim 3 derives first and second
3
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