Reproduction apparatus with selective screening and continuous-tone discrimination
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United States of America Patent
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Jun 9, 1992
Grant Date -
N/A
app pub date -
Jun 1, 1990
filing date -
Jun 1, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Automatic identification of continuous-tone segments of an original document so that such segments can be screened is accomplished by converting the original image into a series of electrical signals characteristic of the optical density gray level of image pixels, calculating the gray level histogram for pixels within defined regions of the original image, and providing signals related to the position of the continuous-tone segment on the basis of the gray level histograms for each region of the original image.
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