Focus adjustment apparatus, focus adjustment method and program, and imaging apparatus including focus adjustment apparatus

Abstract

A focus adjustment apparatus that, based on imaging signals obtained by picking up an optical image of an object formed via a photographing optical system including a focus lens, adjusts a position of the focus lens, reads out, in parallel with an operation of reading out first imaging signals at a predetermined frame rate, second imaging signals at a frame rate that is higher than the predetermined frame rate, the number of the second imaging signals being smaller than the number of the first imaging signals, generates first and second focus signals using the first and second imaging signals, and performs first focus adjustment according to determination of the focus state based on the first focus signal and second focus adjustment according to determination of the focus state based on the second focus signal to determine an in-focus position of the focus lens.