US5867286A
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Color processing method and apparatus thereof using two-dimensional chromaticity separation
Assignee: Samsung Electronics Co Ltd
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Filing: 1996-12-30
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Granted: 1999-02-02
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Expires: 2016-12-30
Abstract
Abstract In a color processing method and apparatus therefor using two-dimensional (2-D) chromaticity separation for minimizing color difference between an original image and a reproduced image in a color apparatus including a color television receiver, the apparatus includes an index calculator for calculating indexes for projecting R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y) in a 3-D color space onto a 2-D chromaticity plane, a first look-up table in which the indexes are stored, a second look-up table in which matrix transformation coefficients which define an input-versus-output relationship between the R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y) are stored and for outputting a predetermined number of transformation coefficients stored in the corresponding address designated by the output signal of the first look-up table, and a color transformation operation unit for receiving the predetermined number of transformation coefficients output from the second look-up table, and performing a matrix operation with respect to the R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y). The color processing apparatus allows real time processing owing to its simplified structure.
Inventors
- 👤 Seong-deok Lee
- 👤 Chang-yeong Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:44
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/68; H04N9/69; H04N9/73; H04N9/67
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
A color processing method using two-dimensional (2-D) chromaticity separation comprising the steps of: converting an arbitrary point in a three-dimensional (3-D) color space indicated by three color signals into a designation of a particular cell in a 2-D chromaticity plane separated into a plurality of cells; providing a memory which stores at least one matrix transformation coefficient corresponding to each of said plurality of cells at respective addresses thereof, wherein each of said plurality of cells corresponds to a particular address in said memory; determining an address of a memory corresponding to said designated particular cell; reading a matrix transformation coefficient stored in said determined address from said memory; and performing a matrix operation on said three color signals using said read matrix transformation coefficient to obtain three converted color signals.
Claim 2
Dependent Claim
131 words
A color processing method using two-dimensional (2-D) chromaticity separation comprising the steps of: converting an arbitrary point in a three-dimensional (3-D) color space indicated by three color signals into a designation of a particular cell in a 2-D chromaticity plane separated into a plurality of cells; providing a memory which stores at least one matrix transformation coefficient corresponding to each of said plurality of cells at respective addresses thereof, wherein each of said plurality of cells corresponds to a particular address in said memory; determining an address of a memory corresponding to said designated particular cell; reading a matrix transformation coefficient stored in said determined address from said memory; and performing a matrix operation on said three color signals using said read matrix transformation coefficient to obtain three converted color signals.
Claim 3
Dependent Claim
36 words
A color processing method using 2-D chromaticity separation as claimed in claim 1, further comprising the step of: obtaining a transformation coefficient for each of said separated cells to then store the same in said memory.
Claim 4
Dependent Claim
215 words
A color processing method using 2-D chromaticity separation as claimed in claim 2, wherein said transformation coefficient obtaining step comprises the steps of: inputting a predetermined number of colors to addresses from 0 to 255 in predetermined section intervals for the respective R, G and B color signals and measuring the corresponding colors as predetermined color coordinate values to then output the same as measured values; converting said measured color coordinate values to Rr, Gr and Br color values using a predetermined transformation matrix; separating a section in a predetermined size in a 2-D chromaticity plane, projecting said converted Rr, Gr and Br color values onto said 2-D chromaticity plane to then obtain measured values belonging to each separated cell, and obtaining an input-versus-output relationship between said R, G and B color signals and said measured color coordinate values in each separated cell; obtaining a transformation matrix for each cell for converting said R, G and B color signals into a color-corrected Rc, Gc and Bc signals from said input-versus-output relationship; and repeatedly performing a cell grouping by which, among said transformation matrix coefficients for the respective cells, coefficients having similar characteristics are collected to form a group, with respect to all cells, to minimize the number of transformation matrices in said 2-D chromaticity plane.
Claim 5
Dependent Claim
159 words
A color processing apparatus using two-dimensional (2-D) chromaticity separation comprising: an index calculator for calculating indices for projecting R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y) in a 3-D color space onto a 2-D chromaticity plane; a first look-up table in which said indices are stored; a second look-up table in which matrix transformation coefficients which define an input-versus-output relationship between said R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y) are stored and for outputting a predetermined number of transformation coefficients stored in the corresponding address designated by the output signal of said first look-up table; and a color transformation operation unit for receiving said predetermined number of transformation coefficients output from said second look-up table, performing a matrix operation with respect to said R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y).
Claim 6
Dependent Claim
159 words
A color processing apparatus using two-dimensional (2-D) chromaticity separation comprising: an index calculator for calculating indices for projecting R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y) in a 3-D color space onto a 2-D chromaticity plane; a first look-up table in which said indices are stored; a second look-up table in which matrix transformation coefficients which define an input-versus-output relationship between said R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y) are stored and for outputting a predetermined number of transformation coefficients stored in the corresponding address designated by the output signal of said first look-up table; and a color transformation operation unit for receiving said predetermined number of transformation coefficients output from said second look-up table, performing a matrix operation with respect to said R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y).
Claim 7
Dependent Claim
91 words
A color processing apparatus using two-dimensional (2-D) chromaticity separation as claimed in claim 4, further comprising: a gamma inverse correction unit for inversely correcting gamma components of said R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y) to linearize the same, and applying the linearized signals to said index calculator (and color transformation operation unit, respectively); and an RGB gamma correction unit for linearly compensating RGB gamma characteristics of related circuits to display transformed color signals output from said color transformation operation unit.
Claim 8
Dependent Claim
92 words
A color processing apparatus using two-dimensional (2-D) chromaticity separation as claimed in claim 5, further comprising: a gamma inverse correction unit for inversely correcting gamma components of said R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y) to linearize the same, and applying the linearized signals to said index calculator (and color transformation operation unit, respectively); and an RGB gamma correction unit for linearly compensating for RGB gamma characteristics of related circuits to display transformed color signals output from said color transformation operation unit.
Claim 9
Dependent Claim
147 words
A color processing apparatus using two-dimensional (2-D) chromaticity separation comprising: an index calculator for calculating indices for projecting R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y) in a 3-D color space onto a 2-D chromaticity plane; a look-up table in which matrix transformation coefficients which define an input-versus-output relationship between said R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y) are stored and for outputting a predetermined number of transformation coefficients stored in the corresponding address designated by the output signal of said index calculator; and a color transformation operation unit for receiving said predetermined number of transformation coefficients output from said second look-up table, performing a matrix operation with respect to said R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y).
Claim 10
Dependent Claim
147 words
A color processing apparatus using two-dimensional (2-D) chromaticity separation comprising: an index calculator for calculating indices for projecting R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y) in a 3-D color space onto a 2-D chromaticity plane; a look-up table in which matrix transformation coefficients which define an input-versus-output relationship between said R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y) are stored and for outputting a predetermined number of transformation coefficients stored in the corresponding address designated by the output signal of said index calculator; and a color transformation operation unit for receiving said predetermined number of transformation coefficients output from said second look-up table, performing a matrix operation with respect to said R, G and B color signals or luminance signal (Y) and color difference signals (R-Y and B-Y).
References Cited (Backward Citations)
US4989080A
Cited
US5650942A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-02-01 | 2002-08-03 | 2003-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-01 | 2006-08-03 | 2007-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-01 | 2010-08-03 | 2011-02-02 | $7700.00 | Window Closed / Lapsed |