Communications: electrical – Digital comparator systems
Patent
1979-04-11
1981-04-14
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
3401463AG, G06K 944
Patent
active
042622808
ABSTRACT:
For compensating tolerances within a photodiode matrix of a scanning unit, in a single scanning process, various momentary, column, displaced positions of a scanning pattern are compared with one another as current image signals. To this end, the plurality of black elements in an image signal to be first intermediately stored in a first image memory is counted in an image element counting device. When the current image signal reproduces a "fat" character, the white elements of the current image signal and of a correlated image pattern intermediately stored in a second image memory are disjunctively linked with one another in a switching device. Given "weak" characters, the black elements are employed. Insofar as the direction of the relative velocity between the scanning unit and a recording medium is not prescribed, a plurality of positions of the correlated image signal are to be employed for a comparison in a comparator circuit. This comparison yields the position with the best coincidence. Therefore, a center/left or, respectively, a center/right displacement of the current image signal with respect to the correlated image signal can be compensated by means of a corresponding control of the switching device. The independence of the scanning direction offers an advantage in a preferred use of the circuit arrangement in hand-held reading devices.
REFERENCES:
patent: 3104372 (1963-09-01), Rabinow et al.
patent: 3582887 (1971-06-01), Guthrie
patent: 3644890 (1972-02-01), Matthews
patent: 3676847 (1972-07-01), Partin
patent: 3688266 (1972-08-01), Watanabe et al.
patent: 3973239 (1976-08-01), Kakumoto et al.
Boudreau Leo H.
Computer Gesellschaft Konstanz mbH
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