Patent ID: 11953448
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 17:
18. The method of claim 16, further comprising comparing the gray scale value of each first region to the gray scale reference and comparing the gray scale value of each second region to the gray scale reference to define a first group, a second group and an Nth group, wherein each of the first group, the second group and the Nth group has at least the first region or the second regions, each of first region or the second regions in the first group has a first difference between its gray scale value and the gray scale reference, each of the first region the second regions in the second group has a second difference between its gray scale value and the gray scale reference, each of the first region and the second regions in the Nth group has an Nth difference between its gray scale value and the gray scale reference.