Radiation image processing
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United States of America Patent
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-
May 24, 1988
Grant Date -
N/A
app pub date -
Oct 28, 1985
filing date -
Nov 14, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for image processing on a radiation image which may be a conventional radiographic image on X-ray film or a radiation image which is stored in a stimulable phosphor and read out therefrom. The radiation image is scanned by a light beam or stimulating rays and an image signal is obtained by use of a photodetector. The image signal is subjected to a frequency processing by use of an unsharp masking process. The unsharp mask signal (Sus) is used for conducting an operation of Sorg+.beta.(Sorg-Sus) to obtain an image-processed signal S, wherein Sorg is a digital signal for each picture element of the scanned image and .beta. is a frequency emphasizing coefficient. The median of a group of digital signals in an unsharp mask of a predetermined size is employed.
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