Automatic focusing.

摘要

An auto-focusing method comprises setting a plurality of active windows composed of a central window and a plurality of peripheral windows surrounding the central window and allocating weights to the plurality of active windows so as to calculate (S20) an auto-focus value for each step; calculating a rate of change in auto-focus value between a previous step and a current step from the auto-focus value calculated for each step; comparing the calculated rate of change in auto-focus value with preset auto-focus reference values and then changing (S70) a step size in accordance with the comparison result and transferring (S80) a lens to a new position by an amount corresponding to the changed step size.