Optical: systems and elements – Diffraction – Using fourier transform spatial filtering
Patent
1990-03-19
1992-09-29
Arnold, Bruce Y.
Optical: systems and elements
Diffraction
Using fourier transform spatial filtering
250550, 359561, 364822, 382 31, 382 42, 382 43, G02B 2746, G06K 976, G06K 936, G06E 300
Patent
active
051518228
ABSTRACT:
A transform digital optical processing system generates a transform signal of an image. Fourier or other well-known transforms may be employed. The transform signal may be generated in one of two ways: optically or electronically. In optical generation a two dimensional object is generated by modulating a beam of coherent light with an image of the object. A transform image of the modulated coherent light beam is formed, using an optical transform element. The optical transform is then stored in a two dimensional buffer. The transform signal may also be generated electronically by storing a digital video image of an object and generating a Fourier or other transform of the digital video image using vector processing chips or other commercially available digital transform generating computers. This digitally generated information may be analyzed and classified through a neural network type processor. The two-dimensional transform data is then processed to obtain the inspection or other characteristics for comparison against predetermined characteristics. The two dimensional transform is divided into two types of zones, namely wedges and rings. The transform data is then mapped into a corresponding wedge and ring, and the data for each wedge and ring is accumulated or summed to obtain data values. It has been found that the summed wedge and ring data values can accurately characterize an image for inspection or other comparison purposes.
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Hekker Roeland M. T.
Livny Izhak M.
Mercurio Gregory S.
Arnold Bruce Y.
E. I. Du Pont de Nemours and Company
Lerner Martin
Magee Thomas H.
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