US6819794B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image processing apparatus, image processing method, storage medium and program
Assignee: Canon Inc
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Filing: 2001-02-26
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Granted: 2004-11-16
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Expires: 2021-02-26
Abstract
Abstract A first unit obtains a gradation conversion characteristic for equalizing a histogram of an input image. A second unit obtains an inverse characteristic of a gradation conversion characteristic for equalizing a histogram of an image to which a predetermined gradation conversion is applied. A third unit composites the gradation conversion characteristic obtained by the first unit and the inverse characteristic obtained by the second unit. A fourth unit performs fitting on the composited characteristic obtained by the third unit with a lower degree function. Gradation of the input image is converted based on the composited characteristic after the processing by the fourth unit.
Inventors
- 👤 Hitoshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:08
CPC Classifications
G; G06; G06T; G06T5/00; G06T5/40; G06T5/90; G06T5/92; G06T2207/00; G06T2207/10; G06T2207/10116
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
165 words
An imaging apparatus for performing a gradation conversion process on an original image, said apparatus comprising: first forming means for forming an accumulation histogram of the original image, and generating a first gradation conversion table based on the formed accumulation histogram of the original image; second forming means for forming an accumulation histogram of an aimed image, and generating a second gradation conversion table based on the formed accumulation histogram of the aimed image; first generating means for generating an inverse conversion table of the second gradation conversion table generated by said second forming means; second generating means for generating a composite table obtained by compositing the first gradation conversion table generated by said first forming means and the inverse conversion table generated by said first generating means; third generating means for generating a gradation conversion function by fitting the composite table by a function; and gradation conversion means for performing the gradation conversion process on the original image based on the gradation conversion function.
Claim 2
Dependent Claim
165 words
An imaging apparatus for performing a gradation conversion process on an original image, said apparatus comprising: first forming means for forming an accumulation histogram of the original image, and generating a first gradation conversion table based on the formed accumulation histogram of the original image; second forming means for forming an accumulation histogram of an aimed image, and generating a second gradation conversion table based on the formed accumulation histogram of the aimed image; first generating means for generating an inverse conversion table of the second gradation conversion table generated by said second forming means; second generating means for generating a composite table obtained by compositing the first gradation conversion table generated by said first forming means and the inverse conversion table generated by said first generating means; third generating means for generating a gradation conversion function by fitting the composite table by a function; and gradation conversion means for performing the gradation conversion process on the original image based on the gradation conversion function.
Claim 3
Dependent Claim
28 words
An apparatus according to claim 1 , wherein said third generating means means performs the fitting with restraining conditions in which a defined density conversion point is fixed.
Claim 4
Dependent Claim
25 words
An apparatus according to claim 2 , further comprising extracting means for extracting data of the defined density conversion point out of the original image.
Claim 5
Dependent Claim
45 words
An apparatus according to claim 1 , further comprising a plurality of memory means for storing a plurality of aimed images, wherein said second generating means uses the aimed image which corresponds to an instruction of a user from among the plurality of aimed images.
Claim 6
Dependent Claim
24 words
An apparatus according to claim 4 , wherein the plurality of aimed images correspond to each photographed part of a subject in radiation photographing.
Claim 7
Dependent Claim
33 words
An apparatus according to claim 1 , further comprising operating means for changing a gradation of the aimed image, wherein the result of said operating means is set as a new aimed image.
Claim 8
Dependent Claim
43 words
An apparatus according to claim 1 , further comprising irradiation means for irradiating a subject; and sensor means for picking up an image from the irradiation by said irradiation means, wherein the original image is an image picked up by said sensor means.
Claim 9
Dependent Claim
144 words
An imaging method of performing a gradation conversion process on an original image, said method comprising the steps of: forming an accumulation histogram of the original image, and generating a first gradation conversion table based on the formed accumulation histogram of the original image; forming an accumulation histogram of an aimed image, and generating a second gradation conversion table based on the formed accumulation histogram of the aimed image; generating an inverse conversion table of the second gradation conversion table generated in said second forming step; generating a composite table obtained by compositing the first gradation conversion table generated in said first forming step and the inverse conversion table generated in said first generating step; generating a gradation conversion function by fitting the composite table by a function; and performing the gradation conversion process on the original image based on the gradation conversion function.
Claim 10
Dependent Claim
144 words
An imaging method of performing a gradation conversion process on an original image, said method comprising the steps of: forming an accumulation histogram of the original image, and generating a first gradation conversion table based on the formed accumulation histogram of the original image; forming an accumulation histogram of an aimed image, and generating a second gradation conversion table based on the formed accumulation histogram of the aimed image; generating an inverse conversion table of the second gradation conversion table generated in said second forming step; generating a composite table obtained by compositing the first gradation conversion table generated in said first forming step and the inverse conversion table generated in said first generating step; generating a gradation conversion function by fitting the composite table by a function; and performing the gradation conversion process on the original image based on the gradation conversion function.
Claim 11
Dependent Claim
152 words
A storage medium storing a computer program executing an imaging method of performing a gradation conversion process on an original image, said method comprising the steps of: forming an accumulation histogram of the original image, and generating a first gradation conversion table based on the formed accumulation histogram of the original image; forming an accumulation histogram of an aimed image, and generating a second gradation conversion table based on the formed accumulation histogram of the aimed image; generating an inverse conversion table of the second gradation conversion table generated in said second forming step; generating a composite table obtained by compositing the first gradation conversion table generated in said first forming step and the inverse conversion table generated in said first generating step; generating a gradation conversion function by fitting the composite table by a function; and performing the gradation conversion process on the original image based on the gradation conversion function.
Claim 12
Dependent Claim
152 words
A storage medium storing a computer program executing an imaging method of performing a gradation conversion process on an original image, said method comprising the steps of: forming an accumulation histogram of the original image, and generating a first gradation conversion table based on the formed accumulation histogram of the original image; forming an accumulation histogram of an aimed image, and generating a second gradation conversion table based on the formed accumulation histogram of the aimed image; generating an inverse conversion table of the second gradation conversion table generated in said second forming step; generating a composite table obtained by compositing the first gradation conversion table generated in said first forming step and the inverse conversion table generated in said first generating step; generating a gradation conversion function by fitting the composite table by a function; and performing the gradation conversion process on the original image based on the gradation conversion function.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-11-16 | 2008-05-17 | 2008-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-11-16 | 2012-05-17 | 2012-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-11-16 | 2016-05-17 | 2016-11-16 | $7700.00 | Window Closed / Lapsed |