Patent ID: 8107806

Claim:
A focus adjustment apparatus comprising: an imaging unit configured to capture an object image input via a focus lens to output image data; a focus adjustment unit configured to perform focus adjustment by controlling a position of the focus lens based on focus evaluation value of the image data; a motion detection unit configured to detect a motion of the object image based on the image data; and a control unit configured to control the focus adjustment unit to perform a first focus adjustment operation if it is not satisfying a predetermined condition, and to control the focus adjustment unit to perform a second focus adjustment operation different from the first focus adjustment operation if it is satisfying the predetermined condition, wherein the predetermined condition includes a condition that motion of the object image is detected by the motion detection unit, and wherein the control unit controls the focus adjustment unit so as to, in the first focus adjustment operation, determine movement direction of the focus lens according to a comparison result of current focus evaluation value and previous focus evaluation value and move the focus lens to the determined movement direction, and in the second focus adjustment operation, to predict a position of the object according to a plurality of in-focus positions which are previously detected and move the focus lens within a movement area which is set based on the predicted position of the object.