AUTO-FOCUS CONTROL USING IMAGE STATISTICS DATA BASED ON COARSE AND FINE AUTO-FOCUS SCORES Russian patent published in 2015 - IPC H04N5/232 

FIELD: physics, photography.

SUBSTANCE: invention relates to digital imaging devices. The result is achieved due to that statistics logic may determine a coarse position which indicates an optimal focus area which, in one embodiment, may be determined by searching for the first coarse position in which a coarse auto-focus score decreases with respect to a coarse auto-focus score at a previous position. Using this position as a starting point for fine score searching, the optimal focal position may be determined by searching for a peak in fine auto-focus scores. In another embodiment, auto-focus statistics may also be determined based on each colour of the Bayer RGB, such that, even in the presence of chromatic aberrations, relative auto-focus scores for each colour may be used to determine the direction of focus.

EFFECT: determining an optimal focal position using auto-focus statistics.

19 cl, 4 tbl, 97 dwg