Appeal No. 95-5109
Application No. 08/063,665
averaging means (claims 1 and 3 through 13) or a low-pass
filter means (claim 2) to determine an auto-focus measurement
value on the basis of contrast components of a field of a
video signal.
Konda discloses a digital color video camera (Figure 4)
that has an auto-focus detector 21, an auto-exposure detector
22 and an auto-white detector 23. The input video signal 31
is separated into luminance and chrominance signals by
separators 32 and 33, respectively. The luminance portion of
the video signal travels through a series of filters 35
through 38, a series of selectors 39A through 39D, and a
series of coring circuits 40A through 40D before being gated
by gates 41A through 41D and switches 42A through 42D into a
series of peak detector 43A through 43D. Kondo discloses
(column 12, lines 43 through 64) that each of the peak
detectors may be a peak detector circuit for detecting the
maximum level of a high frequency component of a luminance
signal during a video line interval or, in the alternative, a
peak detector circuit for detecting the maximum level of a
high frequency component of a luminance signal during a
vertical field interval. The two different peak detector
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