Boots – shoes – and leggings
Patent
1989-05-03
1991-05-28
Dixon, Joseph L.
Boots, shoes, and leggings
364559, 36472912, 250561, 356400, 358101, 382 8, G01N 2186, G01B 1100, G06F 1531
Patent
active
050200062
ABSTRACT:
A method for locating the signal from a fiducial mark which is separated by a known distance from a second fiducial mark is disclosed. The signals from the fiducial marks are presumed to be corrupted by noise. The method utilizes the known spacing of the fiducial marks to construct a filter function which, when convolved with the corrupted signal, produces an enhanced signal having a peak at the location of the fiducial mark.
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Murakami, et al.--Laser Step Alignment for Wafer Stepper--SPIE, vol. 538, Optical Microlitholgraphy IV (1985) pp. 9-16.
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Slonaker, et al.-Enhanced Global Alignment for Production Optical Lithography-Internal Nikon Publication.
Tsen-gong Jum Hsu-Digital Adaptive Matched Filter for Fiducial Mark Registration-(1981, May) Hewlett Packard Journal.
Dixon Joseph L.
Hewlett--Packard Company
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