US4387428A
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Method of and apparatus for processing a radiation image
Assignee: Fujifilm Holdings Corp
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Filing: 1980-12-29
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Granted: 1983-06-07
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Expires: 2000-12-29
Abstract
Abstract A method of and apparatus for processing a radiation image in a radiation image recording system in which a stimulable phosphor is stimulated with a scanning stimulating ray and the light emitted from the stimulable phosphor upon stimulation by the stimulating ray is detected by a detector which gives an output to be processed and used for recording a visible image on a recording material. In the processing of the detected output, an operation represented by a formula S'=Sorg+F(X) is conducted at every scanning point, where Sorg is the original image signal detected by the detector, Sus is an unsharp mask signal corresponding to a super-low spatial frequency, X is Sorg-Sus, and F(X) is a monotonically increasing function which satisfies the condition of F'(X 1 )≧F'(X 2 )≧0 for arbitrary values X 1 , X 2 of X (|X 1 |<|X 2 |) and in which there exists at least one certain value X 0 of X which satisfies the condition of F'(X 1 )>F'(X 2 ) when |X 1 |<|X 0 |<|X 2 |.
Inventors
- 👤 Masamitsu Ishida
- 👤 Hisatoyo Kato
- 👤 Seiji Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:12
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/409; B; B29; B29C; B29C65/00; B29C65/002; G; G03; G03C; G03C5/00; G03C5/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
186 words
A method of processing a radiation image in a radiation image recording system in which a stimulable phosphor is scanned with a stimulating ray and the radiation image information recorded in the stimulable phosphor is read out and converted into an electric signal upon stimulation thereof and then a visible image is recorded on a recording material by use of the electrical signal, said method comprising a step of conducting an operation represented by a formula S'=Sorg+F(X) is conducted at every scanning point, where Sorg is the original image signal read out from the stimulable phosphor, Sus is an unsharp mask signal corresponding to a super-low spatial frequency, X is Sorg-Sus, and F(X) is a monotomically increasing function which satisfies the condition of F'(X 1 )≧F'(X 2 )≧0 for arbitrary values X 1 , X 2 of X (|X 1 |<|X 2 |) and in which there exists at least one certain value X 0 of X which satisfies the condition of F'(X 1 )>F'(X 2 ) when |X 1 |<|X 0 |<|X 2 |, whereby the frequency component above said super-low spatial frequency is emphasized.
Claim 2
Independent Claim
186 words
A method of processing a radiation image in a radiation image recording system in which a stimulable phosphor is scanned with a stimulating ray and the radiation image information recorded in the stimulable phosphor is read out and converted into an electric signal upon stimulation thereof and then a visible image is recorded on a recording material by use of the electrical signal, said method comprising a step of conducting an operation represented by a formula S'=Sorg+F(X) is conducted at every scanning point, where Sorg is the original image signal read out from the stimulable phosphor, Sus is an unsharp mask signal corresponding to a super-low spatial frequency, X is Sorg-Sus, and F(X) is a monotomically increasing function which satisfies the condition of F'(X 1 )≧F'(X 2 )≧0 for arbitrary values X 1 , X 2 of X (|X 1 |<|X 2 |) and in which there exists at least one certain value X 0 of X which satisfies the condition of F'(X 1 )>F'(X 2 ) when |X 1 |<|X 0 |<|X 2 |, whereby the frequency component above said super-low spatial frequency is emphasized.
Claim 3
Dependent Claim
54 words
A method of processing a radiation image in a radiation image recording system as defined in claim 1 wherein said unsharp mask signal corresponds to the modulation transfer function which is not less than 0.5 at the spatial frequency of 0.01 cycle/mm and not more than 0.5 at the spatial frequency of 0.5 cycle/mm.
Claim 4
Dependent Claim
54 words
A method of processing a radiation image in a radiation image recording system as defined in claim 1 wherein said unsharp mask signal corresponds to the modulation transfer function which is not less than 0.5 at the spatial frequency of 0.02 cycle/mm and not more than 0.5 at the spatial frequency of 0.15 cycle/mm.
Claim 5
Independent Claim
39 words
A method of processing a radiation image in a radiation image recording system as defined in any one of claims 1 to 3 wherein said monotomically increasing function F(X) is a nonlinear function which satisfies the conditions of ##EQU12##
Claim 6
Independent Claim
51 words
A method of processing a radiation image in a radiation image recording system as defined in any one of claims 1 to 3 wherein said monotomically increasing function F(X) is mainly composed of a nonlinear function which satisfies the conditions of ##EQU13## and partly includes a linear function represented by F"(X)=0.
Claim 7
Independent Claim
48 words
A method of processing a radiation image in a radiation image recording system as defined in any one of claims 1 to 3 wherein said monotomically increasing function F(X) is a combination of a plurality of linear functions which approximate a nonlinear function satisfying the conditions of ##EQU14##
Claim 8
Dependent Claim
49 words
A method of processing a radiation image in a radiation image recording system as defined in claim 4 wherein said monotomically increasing function F(X) is a nonlinear function represented by F(X)=α·sgn(X)·|X|.sup.n +b wherein α and b are constants and α>0, 0<n<1, and sgn(X)=1 (X>0), sgn(X)=-1 (X<0), and sgn(X)=0 (X=0).
Claim 9
Dependent Claim
37 words
A method of processing a radiation image in a radiation image recording system as defined in claim 4 wherein said monotomically increasing function F(X) is a nonlinear function represented by F(X)=α· sin (pX) where |pX|<π/2 and α>0.
Claim 10
Dependent Claim
35 words
A method of processing a radiation image in a radiation image recording system as defined in claim 4 wherein said monotomically increasing function F(X) is a nonlinear function represented by F(X)=1-e.sup.-x (X>0), and F(X)=1+e.sup.x (X<0).
Claim 11
Independent Claim
180 words
An apparatus for processing a radiation image in a radiation image recording system comprising a stimulating ray source for emitting a stimulating ray which scans a stimulable phosphor and stimulates the phosphor to have the phosphor emit light according to a radiation image recorded therein, a photodetector for detecting the emitted light and converting the light to an electric signal, and an processing unit means for processing the electric signal, said processing unit means conducting an operation represented by a formula S'=Sorg+F(X) is conducted at every scanning point, where Sorg is the original image signal read out from the stimulable phosphor, Sus is an unsharp mask signal corresponding to a super-low spatial frequency, X is Sorg-Sus, and F(X) is a monotomically increasing function which satisfies the condition of F'(X 1 )≧F'(X 2 )≧0 for arbitrary values X 1 , X 2 of X (|X 1 |<|X 2 |) and in which there exists at least one certain value X 0 of X which satisfies the condition of F'(X 1 )>F'(X 2 ) when |X 1 |<|X 0 |<|X 2 |.
Claim 12
Independent Claim
180 words
An apparatus for processing a radiation image in a radiation image recording system comprising a stimulating ray source for emitting a stimulating ray which scans a stimulable phosphor and stimulates the phosphor to have the phosphor emit light according to a radiation image recorded therein, a photodetector for detecting the emitted light and converting the light to an electric signal, and an processing unit means for processing the electric signal, said processing unit means conducting an operation represented by a formula S'=Sorg+F(X) is conducted at every scanning point, where Sorg is the original image signal read out from the stimulable phosphor, Sus is an unsharp mask signal corresponding to a super-low spatial frequency, X is Sorg-Sus, and F(X) is a monotomically increasing function which satisfies the condition of F'(X 1 )≧F'(X 2 )≧0 for arbitrary values X 1 , X 2 of X (|X 1 |<|X 2 |) and in which there exists at least one certain value X 0 of X which satisfies the condition of F'(X 1 )>F'(X 2 ) when |X 1 |<|X 0 |<|X 2 |.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |