EP0405455A2
Expired / Lapsed
EP
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Pattern recognition apparatus
Assignee: Fujifilm Holdings Corp
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Filing: 1990-06-26
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Granted: —
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Expires: 2010-06-26
Abstract
Abstract An apparatus for determining the probability that the shadow of a tumor designated on a radiation image of an object is the shadow of a malignant tumor on the basis of an image signal representing the radiation image includes a spectrum calculating means, a characteristic value calculating means, and a judging means. The spectrum calculating means obtains the spectrum distribution of the image signal D(r,ϑ) whose coordinates are expressed in polar form with the origin taken as the approximate center of the shadow. From the spectrum distribution the characteristic value calculating means obtains a characteristic value, which the judging means uses to determine the probability that the shadow of a tumor is the shadow of a malignant tumor.
Inventors
- 👤 Wataru Fuji Photo Film Co. Ltd. Ito
- 👤 Shoji Fuji Photo Film Co. Ltd. Hara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 07:12
CPC Classifications
G; G06; G06T; G06T7/00; G06T7/0002; G06T7/0012; G06V; G06V10/00; G06V10/40; G06V10/42; G06T2207/00; G06T2207/30; G06T2207/30004; G06T2207/30096
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
165 words
An apparatus for determining the probability that a shadow of a tumor designated on a radiation image of an object is the shadow of a malignant tumor on the basis of an image signal representing the radiation image, comprising: i) a spectrum calculating means for obtaining the spectrum distribution of the image signal D(r,ϑ) whose coordinates are expressed in polar form with the origin being assigned to the approximate center of said shadow and r and ϑ respectively representing the length of the radius vector and the angle the radius vector makes with a fixed half-line, respectively, said spectrum distribution being obtained with respect to r and ϑ, ii) a characteristic value calculating means for obtaining a characteristic value representing said spectrum distribution on the basis of the spectrum distribution obtained by said spectrum calculating means, and iii) a judging means for determining the probability that said shadow of a tumor is the shadow of a malignant tumor on the basis of said characteristic value.
Claim 2
Independent Claim
165 words
An apparatus for determining the probability that a shadow of a tumor designated on a radiation image of an object is the shadow of a malignant tumor on the basis of an image signal representing the radiation image, comprising: i) a spectrum calculating means for obtaining the spectrum distribution of the image signal D(r,ϑ) whose coordinates are expressed in polar form with the origin being assigned to the approximate center of said shadow and r and ϑ respectively representing the length of the radius vector and the angle the radius vector makes with a fixed half-line, respectively, said spectrum distribution being obtained with respect to r and ϑ, ii) a characteristic value calculating means for obtaining a characteristic value representing said spectrum distribution on the basis of the spectrum distribution obtained by said spectrum calculating means, and iii) a judging means for determining the probability that said shadow of a tumor is the shadow of a malignant tumor on the basis of said characteristic value.
Claim 3
Dependent Claim
25 words
An apparatus as defined in Claim 1 wherein said spectrum distribution is obtained from a one-dimensional Fourier transformation calculated with regard to r and ϑ.
Claim 4
Dependent Claim
25 words
An apparatus as defined in Claim 1 wherein said spectrum distribution is obtained with the maximum entropy method calculated with respect to r and ϑ.
Claim 5
Dependent Claim
25 words
An apparatus as defined in Claim 1 wherein said spectrum distribution is obtained from a two-dimensional Fourier transformation with respect to both r and ϑ.
Claim 6
Independent Claim
29 words
An apparatus as defined in any one of Claims 1 to 4, wherein said characteristic value is based on coordinates of the center of gravity of said spectrum distribution.
Claim 7
Independent Claim
37 words
An apparatus as defined in any one of Claims 1 to 4, wherein said characteristic value is based on the values of the coordinates of an ordered pair of second moments with respect to said spectrum distribution.
References Cited (Backward Citations)
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