| 摘要 |
An image pickup apparatus has an AF function which determines a focus state of an object using an image signal obtained from a signal output of an image pickup device and detects the lens position in an in-focus state. The apparatus includes an image-region setting circuit for selectively extracting an image region for detecting the lens position in an in-focus state, an optimum-exposure-amount calculation circuit for calculating an optimum amount of exposure for the image region using an image signal within the image region set by the image-region setting circuit, and a focus detection circuit for calculating the lens position in an in-focus state using an image signal within the image region exposed with the optimum amount of exposure calculated by the optimum-exposure-amount calculation circuit.
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