Communications: electrical – Digital comparator systems
Patent
1977-04-08
1978-06-27
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
3401463MA, G06K 912
Patent
active
040978460
ABSTRACT:
Preferably, a linear array of light sensing elements is positioned opposite light projected images of alpha-numeric or pictorial data recorded on the frame of a microfiche card or the like. Each alpha-numeric character or pictorial pattern segment is dividable into individual rows and columns of image-forming spots which together form a particular alphabet or numeral character or pictorial pattern segment. The sensing elements and the image spots projected thereon are related in size such that an integral number of light sensing elements are required in both X and Y axis directions to intercept a single image spot. One of the microfiche card or light sensing elements are movable relative to the other so that the various image spots projected therefrom are scanned during a given scanning cycle. The outputs of the sensing elements are sampled at a frequency such that the sampled light sensing element outputs over a given scanning cycle represents the outputs of a hypothetical multiplicity of groups of light sensing elements of said size, together encompassing the entire image field involved, with each group intercepting one image spot. The sampled outputs of the light sensing elements are fed to threshold detector means, which detect only signals representing signals above or below a given threshold level. The threshold detected signals are intitially stored as markers in a storage unit having respective groups of storage points respectively corresponding in number and position to the various groups of light sensing elements for said hypothetical multiplicity of groups of sensing elements. The markers in said groups of storage points are respectively "OR" gated, and the gated signals are stored as markers in corresponding storage points in a second storage unit.
REFERENCES:
patent: 3140466 (1964-07-01), Greanias et al.
patent: 3289164 (1966-11-01), Rabinow
patent: 3351906 (1967-11-01), Van Duuren
Boudreau Leo H.
Energy Conversion Devices Inc.
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