Patent EP1028586A2 successfully refreshed from Google Patents.
EP1028586A2
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EP
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Color conversion device and color conversion method
Assignee: Mitsubishi Electric Corp
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Filing: 1999-12-08
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Granted: —
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Expires: 2019-12-08
Abstract
Abstract By changing coefficients of first comparison-result data relating to respective hues, and and second comparison-result data relating to respective inter-hue areas, only the target hue or inter-hue area among the six hues of red, blue, green, yellow, cyan, and magenta, and the six inter-hue areas can be varied, without affecting other hues and inter-hue areas. Thus, the six hues and six inter-hue areas can be varied independently, and the large-capacity memory is not required.
Inventors
- 👤 Shuichi c/o Mitsubishi Denki K.K. Kagawa
- 👤 Hiroaki c/o Mitsubishi Denki K.K. Sugiura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 18:19
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6075
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
272 words
A color conversion device for performing pixel-by-pixel
color conversion from a first set of three color data
representing red, green and blue, or cyan, magenta and
yellow, into a second set of three color data representing
red, green and blue, or cyan, magenta, and yellow, said
device comprising: first calculation means (1) for calculating a minimum
value α and a maximum value β of said first set of three
color data for each pixel; hue data calculating means (2) for calculating hue data
r, g, b, y, m and c based on said first set of three color
data, and said minimum and maximum values α and β
outputted from said calculating means; means (9a, 9b) for generating first comparison-result
data based on the hue data outputted from said hue data
calculating means; means (10a, 10b, 9c) for generating second comparison-result
data based on said first comparison-result data; second calculation means (8a, 8b) for performing
calculation using the hue data outputted from said hue data
calculating means to produce calculation result data; coefficient generating means (5) for generating
specified matrix coefficients for the hue data, the
calculation result data, the first comparison-result data
and the second comparison-result data; and third calculation means (4+6; 4b) responsive to said
hue data, said first comparison-result data, said second
comparison-result data, said calculation result data, and
the coefficients from said coefficient generating means for
calculating said second set of three color data, said means
performing calculation including matrix calculation
performed at least on said hue data, said first comparison-result
data, said second comparison-result data, said
calculation result data, and the coefficients from said
coefficient generating means.
Claim 2
Dependent Claim
65 words
The color conversion device according to claim 1,
wherein said third calculation means performs said matrix
calculation on said hue data, said first comparison-result
data, said second comparison-result data, said calculation
result data, and the coefficients from said coefficient
generating means, and further includes synthesizing means
(6) for adding said minimum value α from said first
calculation means to the results of said matrix calculation.
Claim 3
Dependent Claim
50 words
The color conversion device according to claim 1,
wherein said third calculation means performs said matrix
calculation on said hue data, said first comparison-result
data, said second comparison-result data, said calculation
result data, the coefficients from said coefficient
generating means, and said minimum value α from said first
calculation means.
Claim 4
Dependent Claim
101 words
The color conversion device according to claim 1,
wherein said first set of three color data represent red, green
and blue, said second set of three color data represent red,
green and blue, and said hue data calculation means calculates the hue data
r, g, b, y, m, c by subtraction in accordance with: r = Ri - α , g = Gi - α , b = Bi - α , y = β - Bi, m = β - Gi, and c = β - Ri, wherein Ri, Gi and Bi represent said first set of three
color data.
Claim 5
Dependent Claim
124 words
The color conversion device according to claim 1,
wherein said first set of three color data represent red, green
and blue, said second set of three color data represent cyan,
magenta and yellow, said device further comprises means for determining
complement of said first set of three color data, and said hue data calculation means calculates the hue data
r, g, b, y, m, c by subtraction in accordance with: r = β - Ci, g = β - Mi, b = β - Yi, y = Yi - α, m = Mi - α , and c = Ci - α . wherein Ci, Mi and Yi represent data produced by the
determination of the complement said first set of three
color data.
Claim 6
Dependent Claim
82 words
The color conversion device according to claim 1,
wherein said first comparison-result data generating means
determines the comparison-result data among the hue data r,
g and b, and the comparison-result data among the hue data
y, m and c, and said second comparison-result data generating means
comprises multiplying means for multiplying the first
comparison-result data outputted from said first comparison-result
data generating means with specific calculation
coefficients, and means for determining the comparison-result
data based on the outputs of said multiplication
means.
Claim 7
Dependent Claim
41 words
The color conversion device according to claim 1,
wherein each of said first comparison-result data is
determined from two of the hue data and is effective for
only one of the six hues of red, green, blue, cyan, magenta
and yellow.
Claim 8
Dependent Claim
43 words
The color conversion device according to claim 1,
wherein each of said second comparison-result data is
determined from two of the first comparison-result data and
is effective for only one of the six inter-hue areas of red-yellow,
yellow-green, green-cyan, cyan-blue, blue-magenta,
and magenta-red.
Claim 9
Dependent Claim
81 words
The color conversion device according to claim 1,
wherein
said coefficient generating means generates specified
matrix coefficients Eij (i = 1 to 3, j = 1 to 3) based on a
formula (5) below: and generates the matrix coefficients Fij (i = 1 to 3, j = 1
to 18, or j = 1 to 19) such that, of the coefficients Fij, the coefficients for
said calculation result data are set to zero, and other
coefficients are set to specified values.
Claim 10
Dependent Claim
139 words
The color conversion device according to claim 1,
wherein said calculating means for calculating a maximum value β and a
maximum value α of said first set of three color data calculates a maximum
value β and minimum value α using said first set of three color data, and
generates an identification code indicating the hue data which is of a value
zero, and said second calculation means performs arithmetic operation on said
hue data based on the identification code outputted from said first calculation
means, said coefficient generating means generates said matrix coefficients
based on the identification code outputted from said first calculation means,
and said matrix calculator performs matrix calculation using the coefficient
from said coefficient generating means to produce second set of three color
data based on the identification code outputted from said first calculation
means.
Claim 11
Independent Claim
38 words
A method of converting image data from a first set of colour component
data to a second set of colour component data using calculations wherein the
calculations include coefficients for adjusting hues and coefficients for
adjusting inter-hue regions.
Claim 12
Dependent Claim
48 words
Apparatus for converting image data from a first set of colour
component data to second set of colour component data comprising means for
calculating the second colour component data using the first set of colour
component data and coefficients for adjusting hues and coefficients for
adjusting inter-hue regions.
Claim 13
Dependent Claim
12 words
A computer program for performing a method as claimed in claim 11.
Claim 14
Dependent Claim
11 words
A computer-readable medium storing a program as claimed in claim 13.
References Cited (Backward Citations)
No citation records indexed.
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