Patent ID: 7848594

Claim:
A measurement method in which size information related to at least two directions of a mark formed on an object is measured, the method comprising: a first image import process in which a first image of the mark is imported by a measurement unit in a first state where the object is set to a reference direction; a second image import process in which a second image of the mark is imported by the measurement unit in a second state where at least a part of the mark is rotated by a predetermined angle α(0°<α<180°) from the first state; a first measurement process in which an image processing accompanied with an edge detection process is applied to the first image and a first size related to a first direction orthogonal to the reference direction of the mark is measured; and a second measurement process in which an image processing accompanied with an edge detection process is applied to the second image and a second size related to a second direction rotated by the angle α with respect to the first direction of the mark is measured.