Boots – shoes – and leggings
Patent
1986-09-22
1988-08-23
Lall, Parshotam S.
Boots, shoes, and leggings
250307, 356388, 356448, G06F 704
Patent
active
047665513
ABSTRACT:
In a method of identifying or comparing compositions of material, the reflectivity of a material to be identified or compared is measured at index points distributed through the near infrared spectrum. A similar measurement is made for at least one standard or known material. From the reflectivity measurements, sets of values representing the first or higher order derivative curves are determined. These values mathematically define vectors by representing the coordinates of the end points of the vectors and multiple dimensional space. An index of a similarity between the composition of a test sample and a standard material is calculated by determining the cosine of the angle between the corresponding vectors.
REFERENCES:
patent: 4590574 (1986-05-01), Edmonds et al.
patent: 4660151 (1987-04-01), Chipman et al.
Reid et al., Applied Spectroscopy, vol. 20, No. 5, 1966, pp. 320-325, "Data-Reduction and Search System for Digital Absorbance Spectra".
Tanabe et al., Analytical Chemistry, vol. 47, No. 1, Jan. 1975, pp. 118-122, "Computer Retrieval of Infrared Spectra by a Correlation Coefficient Method".
de Haseth, Analytical Chemistry, vol. 53, No. 14, pp. 2292-2298, "Interferogram-Based Infrared Search System".
Lall Parshotam S.
Mattson Brian M.
Pacific Scientific Company
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