Method for processing gray scale images and an apparatus thereof
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United States of America Patent
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-
Apr 18, 1989
Grant Date -
N/A
app pub date -
Jul 30, 1987
filing date -
Aug 1, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An original picture taken by an ITV camera is subject to a local maximum filter processing and, if necessary, further to a local minimum filter processing, so that a background image is formed from the original picture itself. A target image included in the original picture is extracted separated from the background image by the subtraction between the thus obtained background image and the original picture. According to the present invention, since the background image is formed on the basis of the original picture, the unevenness or change of brightness, which equally influences on both of the target image and the background image, has no influence on the accurate extraction of the target image.
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