Patent ID: 6901569

Claim:
A corrected mask pattern verification apparatus for verifying that corrected mask pattern data generated based on design mask pattern data has been properly corrected, the corrected mask pattern verification apparatus comprising: a graphic operation section for performing a prescribed graphic operation based on the design mask pattern data and the corrected mask pattern data so as to generate differential mask pattern data indicating a result of the prescribed graphic operation; a graphic reduction-enlargement operation section for reducing the differential mask pattern data and enlarging the differential mask pattern data obtained by the reduction, and generating graphic reduction-enlargement operation data indicating a graphic reduction-enlargement operation result; a first determination section for determining whether or not the graphic reduction-enlargement operation data includes the differential mask pattern, and generating first determination result data indicating a determination result thereof; an area comparison operation section for calculating an area of a differential mask pattern represented by the differential mask pattern data and comparing the calculated area with a prescribed area, and generating area comparison operation data indicating an area comparison operation result; a second determination section for determining whether or not the area comparison operation data includes the differential mask pattern data and generating second determination result data indicating a determination result thereof; and a third determination section for determining whether or not the corrected mask pattern data has been properly corrected based on the first determination result data and the second determination result data.