Apparatus for sensing the condition of a document
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United States of America Patent
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Dec 1, 1987
Grant Date -
N/A
app pub date -
May 9, 1986
filing date -
Sep 11, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This application discloses a method and apparatus for ascertaining the fitness of a document having some printed regions and some unprinted regions, by determining its degree of soiling. A sensor (16) provides reflectance signals representing the intensity of light reflected from a number of sensed elements on the face of the document. A signal processing circuit responsive to the reflectance signals includes means (26) for determining for each of a number of areas of the document, the number of elements in the area which result in a signal level exceeding a first threshold which represents the upper limit of brightness for printed areas on the document; and means (24,34,36) for determining whether the number of elements exceeding the first threshold reaches a given proportion of the total number of sensed elements for that area. Each area is then given a brightness value dependent on the relationship between a second threshold, representing the upper limit of brightness for unprinted areas having an excessive degree of soiling, and those signal levels of the elements of the area which exceed the first threshold. The fitness or unfitness of the document is judged from the brightness values of all such areas.
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