METHOD OF DETERMINING AUTO-FOCUSING FAILURE

摘要

There is provided a method of determining an auto-focusing failure in which the auto-focusing failure may be rapidly determined even in the case that a lens moving for auto-focusing does not detect auto-focusing evaluation values while moving along the entire moving distance. The method includes: sequentially moving a position of a lens for auto-focusing in a plurality of continuous steps; calculating and storing an auto-focusing evaluation value for each of positions to which the lens moves; comparing an auto-focusing evaluation value calculated at a position to which the lens moves with an auto-focusing evaluation value calculated at a previous step to thereby determine whether the auto-focusing evaluation value has increased or decreased; and determining that auto-focusing has failed when the auto-focusing evaluation value changes from an increased state to a decreased state or from a decreased state to an increased state.