Patent ID: 11935227
Assignee: DISCO CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 2:
3. The notch detecting method according to claim 2, further comprising:
a dividing step of dividing the image into a first image and a second image by a straight line that extends radially of the wafer to divide the irregularly shaped area into two parts;
a first similarity calculating step of calculating a first similarity corresponding to a similarity between the first image and an inverted image produced by inverting the second image about the straight line;
a second similarity calculating step of calculating a second similarity corresponding to a similarity between the first image and the second image;
a third notch determining step of determining whether the irregularly shaped area is a notch or not on a basis of the first similarity; and
a fourth notch determining step of determining whether the irregularly shaped area is a notch or not on a basis of the second similarity.