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 Title: |
US4747052:
Radiation image processing
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Hishinuma, Kazuhiro; Kanagawa, Japan
Funahashi, Takeshi; Kanagawa, Japan
Ishida, Masamitsu; Kanagawa, Japan
Karam, Jr., James T.; Monroe, CT
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| Assignee: |
Philips Medical Systems, Inc., Shelton, CT
other patents from PHILIPS MEDICAL SYSTEMS, INC. (438760) (approx. 6)
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| Published / Filed: |
1988-05-24
/ 1985-10-28
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| Application Number: |
US1985000791678
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| IPC Code: |
Advanced:
H04N 1/409;
Core:
more...
IPC-7:
H04N 1/40;
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| U.S. Class: |
Current:
250/587;
358/447;
382/262;
Original:
364/414;
364/514;
358/284;
358/111;
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| Field of Search: |
364/414,515
350/284
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| Priority Number: |
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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+β(Sorg-Sus)
to obtain an image-processed signal S, wherein Sorg is a digital signal for each picture element of the scanned image and β 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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| Attorney, Agent or Firm: |
Haken, Jack E. ;
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| Primary / Asst. Examiners: |
Ruggiero, Joseph; Meyer, Charles B.
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| Maintenance Status: |
E3 Expired Check current status
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| INPADOC Legal Status: |
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| Designated Country: |
DE FR GB
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| Family: |
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First Claim:
Show all 13 claims |
We claim:
1. An X-ray image processing method comprising the steps of:
- scanning an original X-ray image to photoelectrically read, and produce an electrical image signal from, X-ray image information;
- converting said electric image signal into a plurality of digital signals (Dorg) which represent respective picture elements of said X-ray image;
- calculating a median value (Dus) for a group of said digital signals in a mask of a predetermined size;
- filtering said electrical image signal using the filter
D'=Dorg+β(Dorg-Dus)
- where D' is a filtered image signal and β is a frequency emphasizing coefficient; and
- reproducing a visible image of said X-ray image from the filtered image signal;
- thereby emphasizing particular frequency components and objects in said visible image signal.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 31 U.S. patent(s) that reference this one
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