Camera which automatically and properly focuses in situations with relatively low luminance foreground objects and high luminance background objects

摘要

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.