Patent ID: 7596308

Claim:
A lens position adjustment apparatus comprising: a lens; an imaging section for detecting light inputted thereto through the lens and outputting image data; a determination section for determining whether or not both a high luminosity area and a low luminosity area are present in the image data, based on the image data outputted by the imaging section; a control section for controlling a cut-off frequency to be set for a high-pass filter (HPF) which extracts a high frequency component from the image data, when the determination section determines that both a high luminosity area and a low luminosity area are present; a calculation section for calculating an evaluation focus parameter for each position of the lens, based on the high frequency component extracted by the control section via the HPF for which a cut-off frequency has been set; and a lens position adjustment section for positioning the lens at a position where the evaluation focus parameter calculated by the calculation section becomes a maximum value, wherein the determination section determines that both a high luminosity area and a low luminosity area are present, when a proportion of an area of pixels having a high luminosity to the image data exceeds a first certain proportion and a proportion of an area of pixels having a low luminosity to the image data exceeds a second certain proportion.