EP0182423A2
Expired / Lapsed
EP
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Radiation image processing apparatus and method
Assignee: Fujifilm Holdings Corp
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Filing: 1985-11-08
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Granted: —
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Expires: 2005-11-08
Abstract
Abstract A method and apparatus for conducting an image processing on a radiation image including a conventional radiographic image on an X-ray film and a radiation image stored in a stimulable phosphor sheet 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, and the image signal is subjected to a frequency processing by use of an unsharp masking process. As the unsharp mask signal (Sus) used for conducting an operation of 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, a median for a group of digital signals in an unsharp mask of a predetermined size is employed instead of an average level signal of the group of digital signals as conventionally employed.
Inventors
- 👤 Hishinuma Kazuhiro
- 👤 Funahashi Takeshi
- 👤 Ishida Masamitsu
- 👤 James T. Karam
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 16:59
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/409
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
113 words
An X-ray immage processing method for scanning an original X-ray image to photoelectrically read X-ray image information carried thereby, and reproducing a visible image of said X-ray image by use of an electric image signal obtained by said scanning read-out, said image processing method comprising the steps of: converting said electric image signal into a number of digital signals (Dorg) for respective picture elements of said image corresponding to scanning points, obtaining a median (Dus) for a group of said digital signals in a mask of a predetermined size, and conducting an operation of Dorg + /3(Dorg - Dus) using a frequency emphasizing coefficient thereby emphasizing particular frequency components of said image signal.
Claim 2
Dependent Claim
113 words
An X-ray immage processing method for scanning an original X-ray image to photoelectrically read X-ray image information carried thereby, and reproducing a visible image of said X-ray image by use of an electric image signal obtained by said scanning read-out, said image processing method comprising the steps of: converting said electric image signal into a number of digital signals (Dorg) for respective picture elements of said image corresponding to scanning points, obtaining a median (Dus) for a group of said digital signals in a mask of a predetermined size, and conducting an operation of Dorg + /3(Dorg - Dus) using a frequency emphasizing coefficient thereby emphasizing particular frequency components of said image signal.
Claim 3
Dependent Claim
33 words
An X-ray image processing method as defined in Claim 1 wherein the size of said mask is made more than twice as large as the object desired to be emphasized in said image.
Claim 4
Dependent Claim
26 words
An X-ray image processing method as defined in Claim 1 or 2 wherein said median is determined for some of the digital signals in said mask.
Claim 5
Dependent Claim
42 words
An X-ray image processing method as defined in Claim 3 wherein said some of the digital signals is for the picture elements in said mas arranged in a pattern of a cross or "X", or a combination of a cross and "X".
Claim 6
Dependent Claim
150 words
In an X-ray image processing apparatus for an X-ray image information recording and reproducing system which comprises a light source for emitting a scanning light beam which scans an X-ray image carrying X-ray image information and causes reflected light or transmitting light carrying said X-ray image information to be generated s photodetector for detecting said reflected light or transmitting light and converting same into an electric image signal, and an operating means for processing said electric image signal; said operating means comprising: an converter for converting said electric image signal into a number of digital signals (Dorg) for respective picture elements of said image, a first operating means for obtaining a median (Dus) for a group of said digital signals in a mask of a predetermined size, and a second operating means for conducting an operation of Dorg + β (Dorg - Dus) where & is a frequency emphasizing coefficient.
Claim 7
Dependent Claim
150 words
In an X-ray image processing apparatus for an X-ray image information recording and reproducing system which comprises a light source for emitting a scanning light beam which scans an X-ray image carrying X-ray image information and causes reflected light or transmitting light carrying said X-ray image information to be generated s photodetector for detecting said reflected light or transmitting light and converting same into an electric image signal, and an operating means for processing said electric image signal; said operating means comprising: an converter for converting said electric image signal into a number of digital signals (Dorg) for respective picture elements of said image, a first operating means for obtaining a median (Dus) for a group of said digital signals in a mask of a predetermined size, and a second operating means for conducting an operation of Dorg + β (Dorg - Dus) where & is a frequency emphasizing coefficient.
Claim 8
Dependent Claim
25 words
An X-ray image processing apparatus as defined in Claim 5 wherein said first operating means and said second operating means consist of a single processor.
Claim 9
Dependent Claim
138 words
A radiation image processing method for a method of scanning a stimulable phosphor sheet carrying radiation image information stored therein with stimulating rays, photoelectrically reading light emitted by said stimulable phosphor sheet upon exposure thereof to the simulating rays, and reproducing a visible image of said radiation image by use of an electric image signal obtained by said read-out, said image processing method comprising the steps of: converting said electric image signal into a number of digital signals (Sorg) for respective picture elements of said image corresponding to scanning points of said stimulating rays, obtaining a median (Sus) for a group of said digital signals in a mask of a predetermined size, and conducting an operation of Sorg + A (Sorg - Sus) using a frequency emphasizing coefficient β, thereby emphasizing particular frequency components of said image signal.
Claim 10
Dependent Claim
138 words
A radiation image processing method for a method of scanning a stimulable phosphor sheet carrying radiation image information stored therein with stimulating rays, photoelectrically reading light emitted by said stimulable phosphor sheet upon exposure thereof to the simulating rays, and reproducing a visible image of said radiation image by use of an electric image signal obtained by said read-out, said image processing method comprising the steps of: converting said electric image signal into a number of digital signals (Sorg) for respective picture elements of said image corresponding to scanning points of said stimulating rays, obtaining a median (Sus) for a group of said digital signals in a mask of a predetermined size, and conducting an operation of Sorg + A (Sorg - Sus) using a frequency emphasizing coefficient β, thereby emphasizing particular frequency components of said image signal.
Claim 11
Dependent Claim
34 words
A radiation image processing method as defined in Claim 7 wherein the size of said mask is made more than twice as large as the object desired to be emphasized in said radiation image.
Claim 12
Dependent Claim
26 words
A radiation image processing method as defined in Claim 7 or 8 wherein said median is determined for some of the digital signals in said mask.
Claim 13
Dependent Claim
42 words
A radiation image processing method as defined in Claim 9 wherein said some of the digital signals is for the picture elements in said mas arranged in a pattern of a cross, or "X" or a combination of a cross and "X".
Claim 14
Dependent Claim
147 words
A radiation image processing apparatus for a radiation image information recording and reproducing system which comprises a stimulating ray source for emitting canning stimulating rays whichscan a stimulable phosphor sheet carrying radiation image information and causes light carrying said radiation image information to be emitted by the stimulable phosphor sheet, a photodetector for detecting said emitted light and converting same into an electric image signal, and an operating means for processing said electric image signal, said operating means comprising. an converter for converting said electric image signal into a number of digital signals (Sorg) for respective picture elements of said image, a first operating means for obtaining a median (Sus) for a group of said digital signals in a mask of a predetermined size, and a second operating means for conducting an operation of Sorg + β (Sorg - Sus) where β is a frequency emphasizing coefficient.
Claim 15
Dependent Claim
147 words
A radiation image processing apparatus for a radiation image information recording and reproducing system which comprises a stimulating ray source for emitting canning stimulating rays whichscan a stimulable phosphor sheet carrying radiation image information and causes light carrying said radiation image information to be emitted by the stimulable phosphor sheet, a photodetector for detecting said emitted light and converting same into an electric image signal, and an operating means for processing said electric image signal, said operating means comprising. an converter for converting said electric image signal into a number of digital signals (Sorg) for respective picture elements of said image, a first operating means for obtaining a median (Sus) for a group of said digital signals in a mask of a predetermined size, and a second operating means for conducting an operation of Sorg + β (Sorg - Sus) where β is a frequency emphasizing coefficient.
Claim 16
Dependent Claim
25 words
A radiation image processing apparatus as defined in Claim 11 wherein said first operating means and said second operating means consist of a single processor.
References Cited (Backward Citations)
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