Patent EP0505200A2 successfully refreshed from Google Patents.
EP0505200A2
Expired / Lapsed
EP
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Radiographic image processing method wherein small variation of density is selectively made clear
Assignee: Fujitsu Ltd
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Filing: 1992-03-20
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Granted: —
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Expires: 2012-03-20
Abstract
Abstract ] A method for processing a radiographic image, containing : a step for calculating an average S m of original image data of an averaging area around each pixel of the radiographic image ; and a step for transforming the original image data S of each pixel of the radiographic image to obtain a processed image data Q of each pixel in accordance with an equation, Q = S + (S - S m ), where (S - S m ) has a characteristic in at least one of first and second ranges of the difference S - S m , the difference S - S m is positive in the first range and negative in the second range, and according to the above characteristic, the absolute value Q - S| varies in accordance with an increasing monotonic function of the absolute value |S - S m | when the absolute value |S - S m | is less than a predetermined value, and the absolute value Q - S| varies in accordance with a decreasing monotonic function of the absolute value |S - S m | when the absolute value |S - S m | of the difference S - S m is more than the predetermined value. The above function (S - S m ) may be a non-odd function of the difference S - S m .
Inventors
- 👤 Takahiro c/o Fujitsu Limited Haraki
- 👤 Shiro c/o Fujitsu Limited Takeda
- 👤 Fumihiro c/o Fujitsu Limited Namiki
- 👤 Hideyuki c/o Fujitsu Limited Hirano
- 👤 Kenji c/o Fujitsu Limited Ishiwata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 13:10
CPC Classifications
G; G06; G06T; G06T5/00; G06T5/20
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
319 words
A method for processing a radiographic image, comprising: a step for calculating an average S m of original image data of an averaging area around each pixel of said radiographic image; and a step for transforming the original image data of each pixel of said radiographic image to obtain a processed image data of each pixel in accordance with an equation, where Q is the processed image data, S is the original image data, and f(S - S m ) is a function of the difference between the original image data S and the average S m , and has a characteristic in at least one of first and second ranges of the difference between the original image data S and the average S m , the difference between the original image data S and the average S m is positive in said first range and negative in said second range, and according to said characteristic, the absolute value |Q - S| of the difference between the processed image data Q and the original image data S varies in accordance with an increasing monotonic function of the absolute value |S - S m | of the difference between the original image data S and the average S m when the absolute value |S - S m | of the difference between the original image data S and the average S m is less than a predetermined value, and the absolute value Q - S| of the difference between the processed image data Q and the original image data S varies in accordance with a decreasing monotonic function of the absolute value S - S m | of the difference between the original image data S and the average S m when the absolute value S - S m | of the difference between the original image data S and the average S m is more than the predetermined value.
Claim 2
Independent Claim
319 words
A method for processing a radiographic image, comprising: a step for calculating an average S m of original image data of an averaging area around each pixel of said radiographic image; and a step for transforming the original image data of each pixel of said radiographic image to obtain a processed image data of each pixel in accordance with an equation, where Q is the processed image data, S is the original image data, and f(S - S m ) is a function of the difference between the original image data S and the average S m , and has a characteristic in at least one of first and second ranges of the difference between the original image data S and the average S m , the difference between the original image data S and the average S m is positive in said first range and negative in said second range, and according to said characteristic, the absolute value |Q - S| of the difference between the processed image data Q and the original image data S varies in accordance with an increasing monotonic function of the absolute value |S - S m | of the difference between the original image data S and the average S m when the absolute value |S - S m | of the difference between the original image data S and the average S m is less than a predetermined value, and the absolute value Q - S| of the difference between the processed image data Q and the original image data S varies in accordance with a decreasing monotonic function of the absolute value S - S m | of the difference between the original image data S and the average S m when the absolute value S - S m | of the difference between the original image data S and the average S m is more than the predetermined value.
Claim 3
Dependent Claim
37 words
A method according to claim 1, wherein said function f(S - S m ) is a non-odd function of the difference S - S m between the original image data S and the average S m .
Claim 4
Dependent Claim
26 words
A method according to claim 2, wherein said absolute value |f(S - S m )| of said function f(S - S m ) satisfies a relationship,
Claim 5
Dependent Claim
26 words
A method according to claim 2, wherein said absolute value |f(S - S m )| of said function f(S - S m ) satisfies a relationship,
Claim 6
Dependent Claim
53 words
A method according to claim 1, wherein said processed image data Q is obtained by using an equation, where P=S/S m , F 2 (P) is a function of second degree of higher, and F 1 (P) is a function of a degree lower than the degree of the function F 2 (P).
Claim 7
Dependent Claim
44 words
A method according to claim 5, wherein said functions F 1 (P) and F 2 (P) are respectively determined in accordance with equations, where A, B, and C are each a constant, determined for a range wherein P>1 and a range wherein P<1, respectively.
Claim 8
Independent Claim
103 words
A method for processing a radiographic image, comprising: a step for calculating an average S m of original image data of an averaging area around each pixel of said radiographic image; and a step for transforming the original image data of each pixel of said radiographic image to obtain a processed imaae data of each pixel in accordance with an eauation. where Q is the processed image data, S is the original image data, and f(S - S m ) is a non-odd function of the difference S - S m between the original image data S and the average S m .
Claim 9
Independent Claim
103 words
A method for processing a radiographic image, comprising: a step for calculating an average S m of original image data of an averaging area around each pixel of said radiographic image; and a step for transforming the original image data of each pixel of said radiographic image to obtain a processed imaae data of each pixel in accordance with an eauation. where Q is the processed image data, S is the original image data, and f(S - S m ) is a non-odd function of the difference S - S m between the original image data S and the average S m .
Claim 10
Dependent Claim
26 words
A method according to claim 7, wherein said absolute value |f(S - S m )| of said function f(S - S m ) satisfies a relationship,
Claim 11
Dependent Claim
26 words
A method according to claim 7, wherein said absolute value |f(S - S m )| of said function f(S - S m ) satisfies a relationship,
Claim 12
Dependent Claim
27 words
A method according to claim 1, wherein said function f(S - S m ) is respectively determined for a plurality of anatomical regions of said radiographic image.
Claim 13
Independent Claim
351 words
An apparatus for processing a radiographic image, comprising: first storing means (112) for storing original image data; averaging means (1) for calculating an average S m of the original image data of an averaging area around each pixel of said radiographic image; transforming means (2, 3, 4) for transforming the original image data of each pixel of said radiographic image to obtain a processed image data of each pixel in accordance with an equation where Q is the processed image data, S is the original image data, and f(S - S m ) is a function of the difference between the original image data S and the average S m , and has a characteristic in at least one of first and second ranges of the difference between the original image data S and the average S m , the difference between the original image data S and the average S m is positive in said first range and negative in said second range, and according to said characteristic, the absolute value Q - S| of the difference between the processed image data Q and the original image data S varies in accordance with an increasing monotonic function of the absolute value S - S m | of the difference between the original image data S and the average S m when the absolute value S - S m | of the difference between the original image data S and the average S m is less than a predetermined value, and the absolute value Q - S| of the difference between the processed image data Q and the original image data S varies in accordance with a decreasing monotonic function of the absolute value S - S m | of the difference between the original image data S and the average S m when the absolute value S - S m | of the difference between the original image data S and the average S m is more than the predetermined value; second storing means for storing said processed image data; and displaying means (27) for displaying said processed image data.
Claim 14
Independent Claim
351 words
An apparatus for processing a radiographic image, comprising: first storing means (112) for storing original image data; averaging means (1) for calculating an average S m of the original image data of an averaging area around each pixel of said radiographic image; transforming means (2, 3, 4) for transforming the original image data of each pixel of said radiographic image to obtain a processed image data of each pixel in accordance with an equation where Q is the processed image data, S is the original image data, and f(S - S m ) is a function of the difference between the original image data S and the average S m , and has a characteristic in at least one of first and second ranges of the difference between the original image data S and the average S m , the difference between the original image data S and the average S m is positive in said first range and negative in said second range, and according to said characteristic, the absolute value Q - S| of the difference between the processed image data Q and the original image data S varies in accordance with an increasing monotonic function of the absolute value S - S m | of the difference between the original image data S and the average S m when the absolute value S - S m | of the difference between the original image data S and the average S m is less than a predetermined value, and the absolute value Q - S| of the difference between the processed image data Q and the original image data S varies in accordance with a decreasing monotonic function of the absolute value S - S m | of the difference between the original image data S and the average S m when the absolute value S - S m | of the difference between the original image data S and the average S m is more than the predetermined value; second storing means for storing said processed image data; and displaying means (27) for displaying said processed image data.
Claim 15
Dependent Claim
37 words
An apparatus according to claim 11, wherein said function f(S - S m ) is a non-odd function of the difference S - S m between the original image data S and the average S m .
Claim 16
Dependent Claim
26 words
An apparatus according to claim 12, wherein said absolute value |f(S - S m )| of said function f(S - S m ) satisfies a relationship,
Claim 17
Dependent Claim
26 words
An apparatus according to claim 12, wherein said absolute value |f(S - S m )| of said function f(S - S m ) satisfies a relationship,
Claim 18
Dependent Claim
55 words
An apparatus according to claim 11, wherein said processed image data Q is obtained by using an equation, where P=S / S m , F 2 (P) is a function of second degree or higher, and F 1 (P) is a function of a degree lower than the degree of the function F 2 (P).
Claim 19
Dependent Claim
44 words
An apparatus according to claim 15, wherein said functions F 1 (P) and F 2 (P) are respectively determined in accordance with equations, where A, B, and C are each a constant, determined for a range wherein P>1 and a range wherein P<1, respectively.
Claim 20
Dependent Claim
95 words
An apparatus according to claim 16, further comprising third storing means for storing values of said functions F 1 (P) and F 2 (P) which are determined in advance for respective values of the original image data S and the average S m , for a range wherein P>1 and a range wherein P<1, respectively; and said transforming means reads the values stored in the third storing means corresponding to the original image data S, the average S m , and said range, for obtaining the processed image data Q in accordance with the equation,
Claim 23
Independent Claim
134 words
An apparatus for processing a radiographic image, comprising: first storing means (112) for storing original image data; averaging means (1) for calculating an average S m of the original image data of an averaging area around each pixel of said radiographic image; transforming means (2, 3, 4) for transforming the original image data of each pixel of said radiographic image to obtain a processed image data of each pixel in accordance with an equation, where Q is the processed image data, S is the original image data, and f(S - S m ) is a non-odd function of the difference S - S m between the original image data S and the average S m ; second storing means for storing said processed image data; and displaying means for displaying said processed image data.
Claim 24
Independent Claim
134 words
An apparatus for processing a radiographic image, comprising: first storing means (112) for storing original image data; averaging means (1) for calculating an average S m of the original image data of an averaging area around each pixel of said radiographic image; transforming means (2, 3, 4) for transforming the original image data of each pixel of said radiographic image to obtain a processed image data of each pixel in accordance with an equation, where Q is the processed image data, S is the original image data, and f(S - S m ) is a non-odd function of the difference S - S m between the original image data S and the average S m ; second storing means for storing said processed image data; and displaying means for displaying said processed image data.
Claim 25
Dependent Claim
26 words
An apparatus according to claim 18, wherein said absolute value |f(S - S m )| of said function f(S - S m ) satisfies a relationship,
Claim 26
Dependent Claim
26 words
An apparatus according to claim 18, wherein said absolute value |f(S - S m )| of said function f(S - S m ) satisfies a relationship,
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