Image analysis – Image transformation or preprocessing – Convolution
Patent
1996-08-13
1999-09-07
Kelley, Christopher S.
Image analysis
Image transformation or preprocessing
Convolution
382205, 382276, 382305, 382307, G06K 15316
Patent
active
059499206
ABSTRACT:
A convolver includes a plurality of multipliers for multiplying pixel values of a convolution window by corresponding coefficients of a convolution mask to provide products, a summer for summing the products to provide a result and a memory for storing intermediate results. The convolver may be used to perform an N.times.N convolution in two or more passes. A first subset of pixel values of an N.times.N convolution window and a first subset of corresponding coefficients of an N.times.N convolution mask are supplied to the multipliers during a first pass of the N.times.N convolution. The summer provides an intermediate result for the first pass and stores the intermediate result in the memory. A second subset of pixel values of the N.times.N convolution window and a second subset of corresponding coefficients of the N.times.N convolution mask are supplied to the multipliers during a second pass of the N.times.N convolution. The summer combines the intermediate result and a result of the second pass to provide a final result or a second intermediate result for the N.times.N convolution.
REFERENCES:
patent: 4330833 (1982-05-01), Pratt et al.
patent: 4750144 (1988-06-01), Wilcox
patent: 4791598 (1988-12-01), Liou et al.
patent: 5187755 (1993-02-01), Aragaki
Jordan Stephen D.
Pfister Catherine J.
Chawan Sheela
Hewlett-Packard Co.
Kelley Christopher S.
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