Image analysis – Histogram processing – For setting a threshold
Patent
1990-06-13
1992-04-07
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
340734, 235440, 235470, 358450, G06K 960
Patent
active
051034905
ABSTRACT:
A method storing multiple scanned images of a response-marked form document comprises scanning a copy of the form document on which no response information has been marked, using a scanning method that detects substantially all visual information present on the form document and produces a pixel image thereof and storing that pixel image data in a computer storage device. Additonal steps comprise scanning at least one copy of the same form document that has been marked with at least one response mark that absorbs light falling outside the visible spectrum, using a scanning method that detects only the presence of light outside the visible spectrum and that produces a pixel image of said at least one response mark, then compressing that pixel image to reduce the amount of pixel data used to repressent areas of the form document bearing no response marks and storing the compressed pixel image data in a computer storage device. The visual scan pixel image and the image resulting from a scan for response marks can be merged together to produce a signal image that is comparable in quality and appearance to an image from a single, conventional visual-mode scan.
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Boudreau Leo H.
Fox David
National Computer Systems, Inc.
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