Patent US7944588B2 successfully refreshed from Google Patents.
US7944588B2
Active / In Force
US
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Image correction processing apparatus, image correction processing method, program, and storage medium
Assignee: Canon Inc
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Filing: 2007-07-02
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Granted: 2011-05-17
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Expires: 2027-07-02
Abstract
Abstract An image correction process that suppresses image deterioration in a printed image is provided. An image correction processing apparatus includes an area setting unit which sets an area comprising a plurality of pixels including an interest pixel, a first correction strength setting unit which adaptively sets a first correction strength for at least the interest pixel in the area based on the number of changes and the changing amount, a first correction unit which executes image correction for a pixel, for which the first correction strength is set, by the first correction strength, a second correction strength setting unit which adaptively sets a second correction strength for at least the interest pixel in the area based on the number of changes and the changing amount, and a second correction unit which executes image correction for a pixel, for which the first correction strength is set, by the second correction strength.
Inventors
- 👤 Akitoshi Yamada
- 👤 Yusuke Hashii
- 👤 Fumihiro Goto
- 👤 Masao Kato
- 👤 Tetsuya Suwa
- 👤 Mitsuhiro Ono
- 👤 Fumitaka Goto
- 👤 Arata Miyagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:48
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
315 words
An image correction processing apparatus comprising: a computer including a central processing unit having connected thereto: an area setting unit adapted to set on a target image to be processed an area comprising a plurality of pixels including an interest pixel; a changing times calculating unit adapted to calculate a number of changes value that expresses a frequency of occurrence of changes in luminance values of pixels in said area; a changing amount calculating unit adapted to detect, from the pixels in said area, an edge direction of the interest pixel, and to calculate a changing amount value that expresses a magnitude of changes in luminance values of the pixels in said area in the edge direction; a changing acceleration calculating unit adapted to calculate a changing acceleration value that expresses an acceleration of changes in luminance values of the pixels in said area in the edge direction; a first setting unit adapted to set, in accordance with the calculated number of changes value and the calculated changing amount value, a first correction strength for enhancing the edge for at least the interest pixel in said area; a selecting unit adapted to select, on the line extending from the pixel of interest in the edge direction, a replacement pixel for enhancing the edge of the interest pixel whereas the selection is based on the acceleration of changes in luminance values in the edge direction; a second setting unit adapted to set, in accordance with the calculated number of changes value, the calculated changing amount value, and the calculated changing acceleration value, a second correction strength for correcting the selected replacement pixel; a first correction unit adapted to correct a luminance value of the interest pixel in accordance with the first correction strength; and a second correction unit adapted to correct a luminance value of the selected replacement pixel in accordance with the second correction strength.
Claim 2
Dependent Claim
315 words
An image correction processing apparatus comprising: a computer including a central processing unit having connected thereto: an area setting unit adapted to set on a target image to be processed an area comprising a plurality of pixels including an interest pixel; a changing times calculating unit adapted to calculate a number of changes value that expresses a frequency of occurrence of changes in luminance values of pixels in said area; a changing amount calculating unit adapted to detect, from the pixels in said area, an edge direction of the interest pixel, and to calculate a changing amount value that expresses a magnitude of changes in luminance values of the pixels in said area in the edge direction; a changing acceleration calculating unit adapted to calculate a changing acceleration value that expresses an acceleration of changes in luminance values of the pixels in said area in the edge direction; a first setting unit adapted to set, in accordance with the calculated number of changes value and the calculated changing amount value, a first correction strength for enhancing the edge for at least the interest pixel in said area; a selecting unit adapted to select, on the line extending from the pixel of interest in the edge direction, a replacement pixel for enhancing the edge of the interest pixel whereas the selection is based on the acceleration of changes in luminance values in the edge direction; a second setting unit adapted to set, in accordance with the calculated number of changes value, the calculated changing amount value, and the calculated changing acceleration value, a second correction strength for correcting the selected replacement pixel; a first correction unit adapted to correct a luminance value of the interest pixel in accordance with the first correction strength; and a second correction unit adapted to correct a luminance value of the selected replacement pixel in accordance with the second correction strength.
Claim 3
Dependent Claim
42 words
The apparatus according to claim 1 , wherein said second setting unit sets a different correction strength for each number of changes value within at least a partial value range of a value range that the number of changes value can assume.
Claim 4
Dependent Claim
40 words
The apparatus according to claim 1 , wherein said second setting unit sets a different correction strength for each changing amount value within at least a partial value range of a value range that the changing amount value can assume.
Claim 5
Dependent Claim
170 words
The apparatus according to claim 1 , further comprising: a comparison unit adapted to compare the number of changes value with a first threshold and a second threshold larger than the first threshold; a maximum strength setting unit adapted to set, when the number of changes value is smaller than the first threshold, a maximum strength as the correction strength; a minimum strength setting unit adapted to set, when the number of changes value is larger than the second threshold, a minimum strength as the correction strength; and a third correction strength setting unit adapted to set, when the number of changes value is not less than the first threshold and not more than the second threshold, a different correction strength for each number of changes value so that the correction strength is set to be a maximum strength when the number of changes value equals the first threshold, and the correction strength is set to be a minimum strength when the number of changes value equals the second threshold.
Claim 6
Dependent Claim
163 words
The apparatus according to claim 1 , further comprising: a comparison unit adapted to compare the changing amount value with a third threshold and a fourth threshold larger than the third threshold; a minimum strength setting unit adapted to set, when the changing amount value is smaller than the third threshold, a minimum strength as the correction strength; a maximum strength setting unit adapted to set, when the changing amount value is larger than the fourth threshold, a maximum strength as the correction strength; and a third correction strength setting unit adapted to set, when the changing amount value is not less than the third threshold and not more than the fourth threshold, a different correction strength for each changing amount value so that the correction strength is set to be a minimum strength when the changing amount value equals the third threshold, and the correction strength is set to be a maximum strength when the changing amount value equals the fourth threshold.
Claim 7
Independent Claim
300 words
A method of controlling an image correction processing apparatus, comprising: an area setting step of setting, on a target image to be processed, an area comprising a plurality of pixels including an interest pixel; a changing times calculating step of calculating a number of changes value that expresses a frequency of occurrence of changes in luminance values of pixels in said area; a changing amount calculating step of detecting, from the pixels in said area, an edge direction of the interest pixel, and calculating a changing amount value that expresses a magnitude of changes in luminance values of the pixels in said area in the edge direction; a changing acceleration calculating step of calculating a changing acceleration value that expresses an acceleration of changes in luminance values of the pixels in said area in the edge direction; a first setting step of setting, in accordance with the calculated number of changes value and the calculated changing amount value, a first correction strength for enhancing the edge for at least the interest pixel in said area; a selecting step adapted to select, on the line extending from the pixel of interest in the edge direction, a replacement pixel for enhancing the edge of the interest pixel whereas the selection is based on the acceleration of changes in luminance values in the edge direction; a second setting step of setting, in accordance with the calculated number of changes value, the calculated changing amount value, and the calculated changing acceleration value, a second correction strength for correcting the selected replacement pixel; a first correction step of correcting a luminance value of the interest pixel in accordance with the first correction strength; and a second correction step of correcting a luminance value of the selected replacement pixel in accordance with the second correction strength.
Claim 8
Independent Claim
300 words
A method of controlling an image correction processing apparatus, comprising: an area setting step of setting, on a target image to be processed, an area comprising a plurality of pixels including an interest pixel; a changing times calculating step of calculating a number of changes value that expresses a frequency of occurrence of changes in luminance values of pixels in said area; a changing amount calculating step of detecting, from the pixels in said area, an edge direction of the interest pixel, and calculating a changing amount value that expresses a magnitude of changes in luminance values of the pixels in said area in the edge direction; a changing acceleration calculating step of calculating a changing acceleration value that expresses an acceleration of changes in luminance values of the pixels in said area in the edge direction; a first setting step of setting, in accordance with the calculated number of changes value and the calculated changing amount value, a first correction strength for enhancing the edge for at least the interest pixel in said area; a selecting step adapted to select, on the line extending from the pixel of interest in the edge direction, a replacement pixel for enhancing the edge of the interest pixel whereas the selection is based on the acceleration of changes in luminance values in the edge direction; a second setting step of setting, in accordance with the calculated number of changes value, the calculated changing amount value, and the calculated changing acceleration value, a second correction strength for correcting the selected replacement pixel; a first correction step of correcting a luminance value of the interest pixel in accordance with the first correction strength; and a second correction step of correcting a luminance value of the selected replacement pixel in accordance with the second correction strength.
Claim 9
Dependent Claim
29 words
A non-transitory computer-readable storage medium storing a computer-executable program which causes a computer to execute a method of controlling an image correction processing apparatus according to claim 6 .
References Cited (Backward Citations)
JPH0399354A
Cited
JPH04126461A
Cited
US5291309A
Cited
US6292621B1
Cited
US6191874B1
Cited
JPH1169151A
Cited
US6266156B1
Cited
US6608926B1
Cited
US6694051B1
Cited
JP2002077623A
Cited
US20040001632A1
Cited
US20050134892A1
Cited
US20040196408A1
Cited
JP4126461B2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2014-05-16 | 2014-11-15 | 2015-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2018-05-16 | 2018-11-15 | 2019-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2022-05-16 | 2022-11-15 | 2023-05-17 | $7700.00 | Window Closed / Lapsed |