EP2260678A1 - Conversion of color information for activating a light source - Google Patents
Conversion of color information for activating a light sourceInfo
- Publication number
- EP2260678A1 EP2260678A1 EP09728413A EP09728413A EP2260678A1 EP 2260678 A1 EP2260678 A1 EP 2260678A1 EP 09728413 A EP09728413 A EP 09728413A EP 09728413 A EP09728413 A EP 09728413A EP 2260678 A1 EP2260678 A1 EP 2260678A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- color
- color space
- light source
- central point
- space
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003213 activating effect Effects 0.000 title abstract 2
- 238000006243 chemical reaction Methods 0.000 title description 4
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims description 10
- 230000001795 light effect Effects 0.000 claims description 5
- 238000007620 mathematical function Methods 0.000 claims description 3
- 239000003086 colorant Substances 0.000 abstract description 28
- 230000009466 transformation Effects 0.000 abstract description 12
- 235000019646 color tone Nutrition 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
Definitions
- the invention relates to a method for converting color information for driving a light source, wherein a color information is transmitted from a first color space into a second, larger color space using a coordinate system representing colors.
- a light source for example an LED light (LED: light-emitting diode)
- LED light-emitting diode
- the corresponding color information generally has to be generated as a prerequisite for a corresponding activation of the light source.
- LCD liquid crystal display
- display for short - with the fundamental problem that in general the amount of all the colors which can be produced with such a display is
- LED lights which can produce colored light
- CIE Commission Internationale de l'eclairage
- sRGB standard RGB
- color space the amount of all the colors that are within a certain range in the standard color chart or generally in a color chart will be referred to as "color space.”
- the color space formed by the three named color loci R, G, B will be referred to as "sRGB color space”. designated; In Fig. 2, the sRGB color space is designated by the reference Rl.
- a light source with which light can be generated in different colors usually has a plurality of bulbs, each of which can emit light of a particular color. By appropriately differently weighted control of the lamps can produce light of different colors with such a light source. All colors that can be generated in this way are thus again in the representation of the CIE standard color chart within a polygon whose vertices exactly correspond to the coordinates of the colors in which the individual light sources of the light source can emit light.
- a triangle E1, E2, E3 is shown by way of example for such a polygon. Accordingly, the amount of colors limited by this triangle will hereinafter be referred to as "light source color space" R2.
- the light source color space R2 is larger than the sRGB color space Rl.
- the sRGB color space Rl could be transformed into the light source color space R2 such that the vertices R, G, B of the sRGB color space Rl coincide with the vertices El, E2, E3 of the light source color space R2.
- This is indicated in Fig. 3 with corresponding dotted arrows.
- this would mean that shades move.
- the color locus G is transferred or transformed into the color locus E2, and therefore this transformation from a more yellowish green creates a much darker green.
- the invention is based on the object to provide an alternative method for the implementation of color information for controlling a light source;
- the color display options of the light source should thus be able to be utilized as much as possible.
- a method for converting color information to control a light source wherein a color information is transmitted from a first color space into a second, larger color space using a coordinate system representing colors.
- a coordinate system representing colors In order to transmit the color information, two different color locations, which lie in the coordinate system on a straight line passing through a central point, are displaced along the straight line with respect to the central point in a non-linear manner.
- the color loci are shifted along the straight line with the aid of a non-linear mathematical function, for example an exponential function, a polynomial function or a staircase function.
- a non-linear mathematical function for example an exponential function, a polynomial function or a staircase function.
- a plurality of color loci are displaced along the straight line, whereby a color locus originally located at a boundary of the first color space is shifted to a color locus located at the corresponding boundary of the second color space.
- the second color space can be optimally utilized.
- the central point is a white point.
- a use of a method according to the invention for programming light effects or light sequences of a light source is furthermore provided.
- the transmission of color information is performed using a display whose color space is identical to the first color space.
- the display is connected to a PC and the transmission is still performed using the PC.
- the display is connected to the light source and the light source comprises means for carrying out the method.
- the light source has a color space which is identical to the second color space.
- FIG. 1 shows a sketch of an exemplary embodiment of a method according to the invention, in which a color information is converted from an sRGB color space into a light source using the CIE standard color chart. Color space is transmitted,
- Fig. 3 is an explanatory sketch for a possible implementation of
- Color information from a first color space into a second, larger color space is
- FIG. 1 shows a sketch of an exemplary embodiment of a method according to the invention for converting color information for controlling a light source.
- a color information is transmitted from a first color space into a second, larger color space using a coordinate system representing colors.
- an "original color information” is transferred or transformed by the conversion or transformation into a "transmitted color information", the original color information relating to colors from the first color space and the transmitted color information to colors from the second color space.
- the color information may in particular be information that can be used to generate color effects or color sequences using the light source.
- the light source may be a light source which has a plurality, in particular at least three, illuminants, each of which can generate light of a different color, wherein the luminous means can be dimmed independently of each other. By appropriate control can be generated with such a light source accordingly light in different colors.
- the bulbs may be, for example, LEDs. Accordingly, the light source can be, for example, an LED chip with a plurality of corresponding LEDs.
- the light source can also have more than three bulbs, which generate light in each case a different color can.
- a light source with four or five or even more such bulbs can be provided.
- the coordinate system representing the colors may be, for example, the standard color chart according to CIE, 1931. However, it is also possible to use a different coordinate system for this purpose, for example the standard color chart according to CIE, 1964 or an equally spaced color chart, such as, for example, the CIE 1976 color chart.
- the first color space R1 can be a color space of a color model that is used in a display.
- it can thus be an RGB color space, for example the sRGB color space.
- the display is used to program using a method according to the invention light effects or light sequences that are to be generated with the light source.
- the second, larger color space R2 can be, in particular, the color space of the light source, ie the amount of all possible colors of the light that can be generated by the light source.
- the second color space is, as already mentioned, larger than the first color space.
- the area occupied by the first color space is smaller than the area occupied by the second color space. It is not absolutely necessary that in the coordinate system used, the boundaries of the second color space completely outside the
- Borders of the first color space run.
- the two color spaces can therefore have intersecting boundary lines.
- two different color loci fl and f2 which lie in the coordinate system on a straight line g passing through a central point z, are displaced along the straight line g with respect to the central point z in a non-linear manner.
- non-linear is intended to express that the measure of the displacement is not proportional to the distance of the relevant color locus fl, f2 from the central point z, ie a non-linear extension is carried out with respect to the central point z
- the two color loci fl, f2 lie on a half-line starting from the central point z, wherein the color loci fl, f2 are displaced exclusively along this half-line.
- the two color loci fl and f2 are each marked with a cross, wherein the two color loci fl and fl lie within the first color space Rl, in the example shown within the sRGB color space.
- the color locus fl is shifted by the transfer or transformation of the color information into the color locus fl ', the color locus f2 into the color locus f2'.
- the shifted or transformed color loci fl ', G' lie within the second color space R2.
- the transformed color locations fl ', fl' are each marked with a small circle.
- the central point z lies in a central region of the first color space Rl.
- another white point as the central point, for example one of the white points designated in the literature as D50, D55, D65, D75 or D9300.
- the two color loci fl, f2 lie on the straight line g, which extends through the central point or emanates from it, it can be achieved that when the color loci fl, f2 are displaced or stretched into the transformed color loci fl ', fl 'No or at least no significant change in hue occurs. In this way, a color tone-preserving conversion of the color information is thus made possible overall.
- the color locus f lies farther from the central point z than the color locus f2.
- the color locus fl is moved further along the straight line g than the color locus fl.
- the color locus fl which is farther from the central point z, with respect to the original distance to the central point z and Compared to the shift of the closer color locus F2, disproportionately far shifted.
- the two color loci fl, f2 with the aid of a non-linear mathematical function, for example a
- Exponential function, a polynomial function or a step function, along the line g are shifted.
- a plurality of color loci are shifted along the straight line g, wherein a color location fg, which initially lies at a boundary of the first color space Rl, is shifted by the transmission to a color location fg ', which is at the corresponding boundary of the second color space R2 is.
- the term "corresponding" boundary of the second color space R2 denotes that boundary of the second color space R2 which, viewed from the central point z, lies in the same direction as the respective boundary of the first color space R1.
- the displacement or stretching factor 1 exp (0) (ie, the coordinate values) can be provided and for the intermediate color loci respective displacement or stretching factors resulting from a Weighting with the exponential function at the two mentioned boundary conditions.
- a function may also be provided in which a small neighborhood of the central point z is defined, which includes all color loci which may to some extent be called “whitish.” For transmission, it may then be provided that those color loci, are originally located within this environment, are transferred 1: 1 and those color locations originally are outside the environment, are shifted so that the second color space R2 can be completely filled.
- the method described above is carried out with arbitrary resolution accuracy for all color loci which are originally located in the first color space Rl.
- any number of half-lines can be provided which emanate in a star shape from the central point z or from a white point.
- the result is that the transformation or stretching is different for each hue, because for two half-lines or for two different "hues", in general, two different distances between the boundary of the first color space and the corresponding boundary of the hue It can therefore be provided in particular that the transformation is non-linear and thereby selected for each hue so that just the boundary of the first and inner color space corresponding saturation to that of the corresponding boundary of the second and larger color space corresponding saturation is mapped.
- the method according to the invention can therefore be used for programming light effects or light sequences of a light source.
- a display is used for programming the light effects or light sequences whose color space is identical to the first color space Rl.
- the display can be connected to a PC, whereby the transmission of the color information continues to be performed using the PC.
- the display is connected to the light source and the light source means for performing the method having.
- the light source has a color space which is identical to the second color space R2.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008017072A DE102008017072A1 (en) | 2008-04-03 | 2008-04-03 | Implementation of color information for the control of a light source |
PCT/EP2009/002470 WO2009121620A1 (en) | 2008-04-03 | 2009-04-03 | Conversion of color information for activating a light source |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2260678A1 true EP2260678A1 (en) | 2010-12-15 |
EP2260678B1 EP2260678B1 (en) | 2011-09-07 |
Family
ID=40852017
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09728413A Active EP2260678B1 (en) | 2008-04-03 | 2009-04-03 | Conversion of color information for activating a light source |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2260678B1 (en) |
AT (1) | ATE524051T1 (en) |
DE (1) | DE102008017072A1 (en) |
WO (1) | WO2009121620A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011009292A1 (en) | 2011-01-24 | 2012-07-26 | Vivid Chi Matter And Light Gmbh | Method of controlling hue and saturation of illumination system installed in e.g. touch pad, involves assigning three linear independent color valences in predetermined color space for transformation of Cartesian control signal |
CN110675797B (en) * | 2019-09-25 | 2023-10-13 | 深圳Tcl数字技术有限公司 | Color gamut mapping method, component, display device and storage medium |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69120589T2 (en) * | 1990-04-26 | 1997-02-13 | Bayer Ag | Color separation process |
DE19506595C1 (en) * | 1995-02-24 | 1996-02-01 | Schneider Rundfunkwerke Ag | Transformation of colour signals in colour video system |
US20030111533A1 (en) | 2001-12-19 | 2003-06-19 | Koninklijke Philips Electronics N.V. | RGB led based white light control system with quasi-uniform color metric |
US7259769B2 (en) * | 2003-09-29 | 2007-08-21 | Intel Corporation | Dynamic backlight and image adjustment using gamma correction |
US7176935B2 (en) * | 2003-10-21 | 2007-02-13 | Clairvoyante, Inc. | Gamut conversion system and methods |
EP1849152A4 (en) | 2004-12-20 | 2012-05-02 | Philips Solid State Lighting | Color management methods and apparatus for lighting |
JP2006254368A (en) | 2005-03-14 | 2006-09-21 | Canon Inc | Color processing device and method thereof |
DE102005028671B4 (en) * | 2005-06-17 | 2007-11-29 | Carl Zeiss Jena Gmbh | Method for adjusting the color components of a lighting arrangement |
EP2439729A3 (en) * | 2006-06-02 | 2013-09-04 | Samsung Display Co., Ltd. | Field sequential color display system having multiple segmented backlight |
-
2008
- 2008-04-03 DE DE102008017072A patent/DE102008017072A1/en not_active Ceased
-
2009
- 2009-04-03 EP EP09728413A patent/EP2260678B1/en active Active
- 2009-04-03 AT AT09728413T patent/ATE524051T1/en active
- 2009-04-03 WO PCT/EP2009/002470 patent/WO2009121620A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2009121620A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE524051T1 (en) | 2011-09-15 |
EP2260678B1 (en) | 2011-09-07 |
WO2009121620A1 (en) | 2009-10-08 |
DE102008017072A1 (en) | 2009-10-08 |
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