Camera which automatically and properly focuses in situations with relatively low luminance foreground objects and high luminance background objects
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United States of America Patent
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Apr 22, 2003
Grant Date -
N/A
app pub date -
Feb 20, 1998
filing date -
Feb 25, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An image pickup signal extracted by a gate circuit is applied to a brightness signal generating circuit and a brightness signal is generated. By a high pass filter, high frequency component of the brightness signal is extracted. A digital integrator integrates high frequency signals of one image plane, and outputs the result as an evaluating value to a CPU. CPU detects a situation where there are two peaks of focus evaluating values and the position having maximum focus evaluating value does not correspond to the optical in-focus position, and drives a focus motor such that a focus lens is set at an position where the focus evaluating value is smallest between the two peaks.
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