EP0967791A2
Expired / Lapsed
EP
⏱️ 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: —
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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 C1, C2, 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
EP
Data Source
google_patents
Last Synchronized
2026-10-31 11:21
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: 14
Claim 1
Independent Claim
92 words
An image processing method of detecting a
luminosity of a highlight point and a shadow point of
an original image, obtaining a hue of said highlight
point and said shadow point from plural pixels of said
luminosity, and executing a correction process on said
original image based on said highlight point, said
shadow point and said hue: wherein said correction process executes matching of the
color solid axis of said original image with an axis
indicating the luminosity, and contrast adjustment on a
color component indicating the luminosity of said
original image.
Claim 2
Dependent Claim
33 words
An image processing method according to claim
1, wherein said correction process executes correction
on a color component indicating the hue of the original
image, and adjusting the saturation of the original
image.
Claim 3
Dependent Claim
40 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 said
highlight point and said shadow point from said
histogram.
Claim 4
Dependent Claim
25 words
Am image processing method according to claim
3, wherein, in the preparation of said histogram, data
of high saturation are not included in the histogram.
Claim 5
Dependent Claim
25 words
An image processing method according to claim
1, wherein said correction process is executed for a
photographic image and not executed for a text image.
Claim 6
Dependent Claim
61 words
An image processing method comprising the
steps of: detecting a color solid axis of an original image; judging an exposure state of the original image
from a positional relationship between said color solid
axis and an axis indicating the luminosity in a color
space representing the color solid; and setting an image correcting condition according to
a result of said judgment.
Claim 7
Dependent Claim
30 words
An image processing method according to claim
6, wherein said image correcting condition is a
condition for adjusting the contrast of a component
indicating the luminosity of said original image.
Claim 8
Dependent Claim
60 words
An image processing method for effecting an
image correction process on an original image according
to the color distribution of the original image
comprising steps of: detecting a color solid axis of the original image
in a predetermined color space; and controlling said image correction process based on
a positional relationship of said color solid axis in
said color space.
Claim 9
Dependent Claim
99 words
An image processing apparatus provided with
means for detecting the luminosity of a highlight point
and a shadow point of an original image, means for
obtaining a hue of said highlight point and said shadow
point from plural pixels of said luminosity, and means
for executing a correction process on said original
image based on said highlight point, said shadow point
and said hue; wherein said correction process executes matching of the
color solid axis of said original image with an axis
indicating the luminosity and contrast adjustment on a
color component indicating the luminosity of said
original image.
Claim 10
Dependent Claim
67 words
An image processing apparatus comprising: detection means for detecting a color solid axis
of an original image; judgment means for judging an exposure state of
said original image from a positional relationship
between said color solid axis and an axis indicating
the luminosity in a color space representing said color
solid; and setting means for setting an image correcting
condition corresponding to a result of said judgment.
Claim 11
Dependent Claim
61 words
An image processing apparatus for executing
an image correction process on an original image,
corresponding to the color distribution thereof,
comprising: detection means for detecting the color solid axis
of the original image in a predetermined color space;
and control means for controlling said image
correction process based on a positional relationship
of said color solid axis in said color space.
Claim 12
Dependent Claim
109 words
A computer readable memory medium in which a
program of an image processing method is stored, said
program comprising the steps of detecting a luminosity
of a highlight point and a shadow point of an original
image; obtaining a hue of said highlight point and said
shadow point from plural pixels of said luminosity; and
executing a correction process on said original image
based on said highlight point, said shadow point and
said hue, wherein said correction process executes
matching of the color solid axis of said original image
with an axis indicating the luminosity and contrast
adjustment on a color component indicating the
luminosity of said original image.
Claim 13
Dependent Claim
73 words
A computer readable memory medium storing a
computer program for realizing: detection means for detecting a color solid axis
of an original image; judgment means for judging an exposure state of
said original image from the positional relationship
between said color solid axis and an axis indicating
the luminosity in a color space representing said color
solid; and setting means for setting an image correcting
condition according to a result of said judgment.
Claim 14
Dependent Claim
78 words
A computer readable memory medium in which a
computer program is stored, for realizing: detection means for detecting the color solid axis
of an original image in a predetermined color space;
and control means for controlling said image
correction process based on a positional relationship
of said color solid axis in said color space, wherein said program causes an image correction
process to be executed on the original image
corresponding to the color distribution of the original
image.
References Cited (Backward Citations)
No citation records indexed.
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