Automatic image segmentation using local area maximum and minimum image signals
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United States of America Patent
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-
Mar 8, 1994
Issued Date -
N/A
app pub date -
Jan 12, 1993
filing date -
Jun 27, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus for processing image pixels to determine the presence of high frequency halftone images. Prior to auto correlation, each pixel in the image is examined to determine whether it is a local area maximum or minimum. A binary image function composed of the image local area maximum or minimums is made available for auto correlation. The presence of peaks at shifts indicative of predetermined halftone image frequencies is detected, and an output signal indicative of the presence or absence of peaks at the predetermined halftone image frequencies is provided. The arrangement is combined with a run length encoder to reduce false microdetection results.
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