US6628825B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image processing method, apparatus and memory medium therefor
Assignee: Canon Inc
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Filing: 1999-06-22
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Granted: 2003-09-30
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Expires: 2019-06-22
Abstract
Abstract Correction for color fog is securely achieved with limited load of processing. The RGB image data are converted into the luminance Y and the chromaticity values C 1 , C 2 , then a highlight point and a shadow point are determined and are connected to define the axis of the color solid. The color solid is rotated so as that the axis becomes parallel to the luminance axis Y and is so translated in parallel manner that the pixel of the minimum luminance coincides with the original point of the color space.
Inventors
- 👤 Manabu Yamazoe
- 👤 Kentaro Yano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:02
CPC Classifications
G; G06; G06T; G06T5/00; G06T5/90; G06T5/92; H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6077; G06T2207/00; G06T2207/10; G06T2207/10024
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
105 words
An image processing method comprising the steps of: detecting a luminosity of a highlight point and a shadow point of an original image; obtaining a hue of the highlight point and the shadow point from plural pixels of the luminosity; and executing a correction process on the original image based on the highlight point, the shadow point and the hue, wherein the correction process executed in said executing step executes a color fog correction by matching a color solid axis of the original image with an axis indicating the luminosity, and a contrast adjustment on a color component indicating the luminosity of the original image.
Claim 2
Dependent Claim
105 words
An image processing method comprising the steps of: detecting a luminosity of a highlight point and a shadow point of an original image; obtaining a hue of the highlight point and the shadow point from plural pixels of the luminosity; and executing a correction process on the original image based on the highlight point, the shadow point and the hue, wherein the correction process executed in said executing step executes a color fog correction by matching a color solid axis of the original image with an axis indicating the luminosity, and a contrast adjustment on a color component indicating the luminosity of the original image.
Claim 3
Dependent Claim
39 words
An image processing method according to claim 1 , wherein the correction process executed in said executing step executes correction on a color component indicating the hue of the original image, and adjusts the saturation of the original image.
Claim 4
Dependent Claim
41 words
An image processing method according to claim 1 , further comprising the steps of: preparing a histogram based on a color component indicating the luminosity of the original image; and detecting the highlight point and the shadow point from the histogram.
Claim 5
Dependent Claim
23 words
An image processing method according to claim 3 , wherein data of high saturation are not included in the preparation of the histogram.
Claim 6
Dependent Claim
31 words
An image processing method according to claim 1 , wherein the correction process is executed in said executing step for a photographic image and is not executed for a text image.
Claim 7
Dependent Claim
106 words
An image processing apparatus comprising: detection means for detecting a luminosity of a highlight point and a shadow point of an original image; obtaining means for obtaining a hue of the highlight point and the shadow point from plural pixels of the luminosity; and correction means for executing a correction process on the original image based on the highlight point, the shadow point and the hue, wherein said correction means executes a color fog correction by matching a color solid axis of the original image with an axis indicating the luminosity and a contrast adjustment on a color component indicating the luminosity of the original image.
Claim 8
Dependent Claim
106 words
An image processing apparatus comprising: detection means for detecting a luminosity of a highlight point and a shadow point of an original image; obtaining means for obtaining a hue of the highlight point and the shadow point from plural pixels of the luminosity; and correction means for executing a correction process on the original image based on the highlight point, the shadow point and the hue, wherein said correction means executes a color fog correction by matching a color solid axis of the original image with an axis indicating the luminosity and a contrast adjustment on a color component indicating the luminosity of the original image.
Claim 9
Dependent Claim
113 words
A computer readable memory medium in which a program of an image processing method is stored, said program comprising code for: detecting a luminosity of a highlight point and a shadow point of an original image; obtaining a hue of the highlight point and the shadow point from plural pixels of the luminosity; and executing a correction process on the original image based on the highlight point, the shadow point and the hue, wherein the correction process executes a color fog correction by matching a color solid axis of the original image with an axis indicating the luminosity and a contrast adjustment on a color component indicating the luminosity of the original image.
Claim 10
Dependent Claim
113 words
A computer readable memory medium in which a program of an image processing method is stored, said program comprising code for: detecting a luminosity of a highlight point and a shadow point of an original image; obtaining a hue of the highlight point and the shadow point from plural pixels of the luminosity; and executing a correction process on the original image based on the highlight point, the shadow point and the hue, wherein the correction process executes a color fog correction by matching a color solid axis of the original image with an axis indicating the luminosity and a contrast adjustment on a color component indicating the luminosity of the original image.
References Cited (Backward Citations)
US4488245A
Cited
US5181105A
Cited
US4928167A
Cited
EP0372390A2
Cited
US5057931A
Cited
US5467196A
Cited
US5748773A
Cited
DE4309879A1
Cited
US5696839A
Cited
US5717783A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-09-29 | 2007-03-31 | 2007-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-09-29 | 2011-03-31 | 2011-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-09-29 | 2015-03-31 | 2015-09-30 | $7700.00 | Window Closed / Lapsed |