EP0946050A2
Expired / Lapsed
EP
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Method and apparatus for converting color data
Assignee: Fujifilm Business Innovation Corp
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Filing: 1998-10-29
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Granted: —
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Expires: 2018-10-29
Abstract
Abstract Color data for a color image device (12) having a first color range (gamut) are converted into color data for a color image device (18) having a second color range (gamut). For preventing colors from being altered when color data are converted, first color data in the first color range (gamut) of the first image device (12) is converted into corresponding colors by referring to a classification table (13) representing the correspondence between colors determined based on human color perception and the fist color data, and then the first color data is converted into second color data in the second color range (gamut) of the second image device (18) with respect to each of the classified colors. Since each of the colors based on the human color perception is converted, colors are prevented from being altered due to the conversion. Because each of the colors of a color image is converted, the clearness of the color image will not be lost.
Inventors
- 👤 Shoji C/O Fujitsu Limited Suzuki
- 👤 Masahiro c/o Fujitsu Limited Mori
- 👤 Keiji Uchikawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 13:21
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6058
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
89 words
A method of converting first color data contained in a color range of a first
image device (12) into second color data contained in a color range of a second image
device (18), comprising the steps of: classifying (S1-S3) said first color data into corresponding colors by
referring to a classification table (13) representing the correspondence between colors
determined based on human color perception and said first color data; and converting (S4-S7) said first color data into said second color data with
respect to each of the classified colors.
Claim 2
Dependent Claim
56 words
A method according to claim 1, wherein said step of classifying (S1-S3) the first color data comprises the step of: converting said first color data into a corresponding color code by referring
to a classification table (13) storing data of grid points in a predetermined color space
and color codes corresponding respectively to said grid points.
Claim 3
Dependent Claim
84 words
A method according to claim 2, wherein said step of classifying (S1-S3) the first color data comprises the steps of: deciding whether said first color data is a grid point in said color space; classifying said first color data into a color at the grid point if said first
color data is the grid point; and classifying said first color data into a color at another grid point closest to
said first color data if said first color data is not the grid point.
Claim 4
Dependent Claim
68 words
A method according to claim 1, wherein said step of converting (S4-S7) the classified color comprises the step of: converting said first color data into said second color data such that said first
color data in a color region classified into the color range of said first image device (12)
will be contained in a corresponding color region in the color range of said second
image device (18).
Claim 5
Dependent Claim
57 words
A method according to claim 4, wherein said step of converting (S4-S7) the classified color comprises the step of: converting said first color data in the color region in the color range of said
first image device (12) uniformly into a reference point in the color region in the color
range of said second image device (18).
Claim 6
Dependent Claim
45 words
A method according to claim 5, wherein said step of converting (S4-S7) the classified color comprises the step of: converting said first color data uniformly into a color of lowest saturation in
the color region in the color range of said second image device (18).
Claim 7
Dependent Claim
116 words
A method according to claim 4, wherein said step of converting (S4-S7) the classified color comprises the steps of: using said second color data as said first color data if said first color data is
in an area where the color region of said first image device (12) and the color region of
said second image device (18) overlap each other; and converting said first color data into a color closest thereto in the color region
of said second image device (18) if said first color data is in an area where the color
region of said first image device (12) and the color region of said second image device
(18) do not overlap each other.
Claim 8
Dependent Claim
55 words
A method according to claim 4, wherein said step of converting (S4-S7) the classified color comprises the step of: replacing the first color data in the color region in the color range of said
first image device (12) with a color in the color region in the color range of said second
image device (18).
Claim 9
Dependent Claim
58 words
A method according to claim 8, wherein said step of converting (S4-S7) the classified color comprises the step of: replacing the first color data in the color region in the color range of said
first image device (12) with a color of highest saturation in the color region in the color
range of said second image device (18).
Claim 10
Independent Claim
93 words
An apparatus for converting first color data contained in a color range
of a first image device (12) into second color data contained in a color range of a
second image device (18), comprising: a classification table (13) representing the correspondence between colors
determined based on human color perception and said first color data; and converting means (19) for classifying said first color data into corresponding
colors by referring to said classification table (13), and converting said first color data
into said second color data with respect to each of the classified colors.
Claim 11
Dependent Claim
30 words
An apparatus according to claim 10, wherein said classification table (13) stores data of grid points in a predetermined color
space and color codes corresponding respectively to said grid points.
Claim 12
Dependent Claim
65 words
An apparatus according to claim 11, wherein said converting means (19) comprises means (14) for classifying said first color
data into a color at the grid point if said first color data is the grid point, and classifying
said first color data into a color at another grid point closest to said first color data if
said first color data is not the grid point.
Claim 13
Dependent Claim
64 words
An apparatus according to claim 10, wherein said converting means (19) comprises means (15) for converting said first color
data into said second color data such that said first color data in a color region classified
into the color range of said first image device (12) will be contained in a corresponding
color region in the color range of said second image device (18).
Claim 14
Dependent Claim
53 words
An apparatus according to claim 13, wherein said converting means (19) comprises means (15) for converting said first color
data in the color region in the color range of said first image device (12) uniformly into
a reference point in the color region in the color range of said second image device
(18).
Claim 15
Dependent Claim
41 words
An apparatus according to claim 14, wherein said converting means (19) comprises means (15) for converting said first color
data uniformly into a color of lowest saturation in the color region in the color range of
said second image device (18).
Claim 16
Dependent Claim
111 words
An apparatus according to claim 13, wherein said converting means (19) comprises means (15) for using said second color
data as said first color data if said first color data is in an area where the color region of
said first image device and the color region of said second image device (18) overlap
each other, and converting said first color data into a color closest thereto in the color
region of said second image device (18) if said first color data is in an area where the
color region of said first image device (12) and the color region of said second image
device (18) do not overlap each other.
Claim 17
Dependent Claim
51 words
An apparatus according to claim 13, wherein said converting means (19) comprises means (15) for replacing the first color
data in the color region in the color range of said first image device (12) with a color in
the color region in the color range of said second image device (18).
Claim 18
Dependent Claim
54 words
An apparatus according to claim 17, wherein said converting means (19) comprises means (15) for replacing the first color
data in the color region in the color range of said first image device (12) with a color of
highest saturation in the color region in the color range of said second image device
(18).
References Cited (Backward Citations)
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