Patent ID: 7262804

Claim:
A camera comprising: an image-capturing device that captures a subject image through a photographic lens; a filter device that removes a frequency component equal to or lower than a predetermined frequency from image-capturing signals output from the image-capturing device; a lens drive signal generation device that generates a lens drive signal used to move a focus lens; an evaluation value calculation device that calculates integrating values of pre-removal image-capturing signals still retaining the frequency component before the frequency component is removed by the filter device and integrating values of post-removal image-capturing signals from which the frequency component has been removed, each in correspondence to one of predefined positions of the focus lens; a lens position calculation device that calculates a focused lens position at which focus is achieved based upon the integrating values of the post-removal image-capturing signals calculated by the evaluation value calculation device; and a saturation determination device that judges the image-capturing device to be in a saturated state by using the pre-removal image-capturing signals, wherein: when the saturation determination device judges the image-capturing device to be in the saturated state, (a) the evaluation value calculation device calculates differences between the integrating values of the pre-removal image-capturing signals and the integrating values of the post-removal image-capturing signals each in correspondence to one of predefined positions of the focus lens and (b) the lens position calculation device calculates the focused lens position based upon the calculated differences.