Printed fourier filtering in optical inspection tools

Details Printed fourier filtering in optical inspection tools Printed fourier filtering in optical inspection tools

2006-04-24

2011-10-04

Mehta, Bhavesh (Department: 2624)

Image analysis

Applications

Manufacturing or product inspection

C382S141000, C382S144000, C382S149000, C382S152000, C356S237100, C356S237200, C356S237300, C356S237400, C356S237500, C356S237600, C356S239100, C356S239300, C356S239700, C356S239800

Reexamination Certificate

active

08031931

ABSTRACT:
A spatial mask printer may be used in conjunction with an optical inspection tool. The tool can be used to obtain a Fourier image of an inspected object, and a filter mask image can be designed to block certain aspects of the object's image in the Fourier plane corresponding to repetitive aspects of the imaged object. The filter mask image can then be printed and used in the tool during the inspection process. The mask image may be designed by hand or by computer and may be stored for later use. Filters may be automatically placed into the optical path of the inspection tool by a filter wheel, or may be housed in other filter banks. The printer may be configured to operate in a clean room environment, and may be integrated into the optical inspection tool.

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