EP2260678B1 - Conversion d'informations de couleurs pour la commande d'une source lumineuse - Google Patents

Conversion d'informations de couleurs pour la commande d'une source lumineuse Download PDF

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Publication number
EP2260678B1
EP2260678B1 EP09728413A EP09728413A EP2260678B1 EP 2260678 B1 EP2260678 B1 EP 2260678B1 EP 09728413 A EP09728413 A EP 09728413A EP 09728413 A EP09728413 A EP 09728413A EP 2260678 B1 EP2260678 B1 EP 2260678B1
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EP
European Patent Office
Prior art keywords
color
colour
light source
central point
color space
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Active
Application number
EP09728413A
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German (de)
English (en)
Other versions
EP2260678A1 (fr
Inventor
Kenneth Martin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zumtobel Lighting GmbH Austria
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Zumtobel Lighting GmbH Austria
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Publication of EP2260678A1 publication Critical patent/EP2260678A1/fr
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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
  • LCD liquid crystal display
  • CIE Commission Internationale de l'éclairage
  • CIE Commission Internationale de l'éclairage
  • sRGB standard RGB
  • color space the amount of all colors that are within a certain range in the standard color chart or generally in a color chart is called "color space”.
  • the color space formed by the three named color locations R, G, B is accordingly designated by “sRGB color space”; in Fig. 2 the sRGB color space is designated by the reference symbol R1.
  • 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.
  • Fig. 2 is exemplified for such a polygon a triangle E1, E2, E3 located. 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 R1.
  • the sRGB color space R1 could be transformed into the light source color space R2 such that the vertices R, G, B of the sRGB color space R1 coincide with the vertices E1, E2, E3 of the light source color space R2.
  • This is in Fig. 3 indicated by 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.
  • a method of converting color information to drive a light source using color spaces in the CIE color diagram is known.
  • a method of converting colors from one color space to another color space is known.
  • a color control system is known in which color locus coordinates are transformed from a first to a second color space.
  • 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.
  • color locus which is farther away from the central point than the other color locus is shifted further along the straight line than the other color locus. This allows for the fact that the human eye perceives differences between less saturated colors more clearly than between more saturated colors.
  • 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.
  • 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 performing the method.
  • the light source has a color space which is identical to the second color space.
  • Fig. 1 is a sketch of an embodiment of a method according to the invention for the implementation of color information for controlling a light source shown.
  • 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 chromaticity panel, such as the CIE 1976 color chart.
  • the first color space R1 may be a color space of a color model 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 run completely outside the boundaries of the first color space. The two color spaces can therefore have intersecting boundary lines.
  • two different color locations f1 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 f1, f2 from the central point z.
  • a non-linear extension is performed.
  • the two color loci f1, f2 lie on a half-line starting from the central point z, wherein the color locations f1, f2 are shifted exclusively along this half-line.
  • the two color locations f1 and f2 are each marked with a cross, with the two color locations f1 and f2 lying within the first color space R1, that is to say within the sRGB color space in the example shown.
  • the color location f1 is shifted by the transfer or transformation of the color information into the color location f1 ', the color location f2 in the color location f2'.
  • the shifted or transformed color locations f1 ', f2' lie within the second color space R2.
  • the transformed color locations f1 ', f2' are each marked with a small circle.
  • the central point z lies in a central region of the first color space R1.
  • 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 f1, f2 lie on the straight line g, which extends through the central point or emanates from it, it can be achieved that during the displacement or extension of the color loci f1, f2 into the transformed color loci f1, f2 ' 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 f1 is farther from the central point z than the color locus f2. It is provided that the color location f1 further along the. Line g is shifted as the color point f2. In particular, it can be provided that the color location f1, which is farther away from the central point z, is shifted disproportionately far with respect to the original distance to the central point z and compared to the displacement of the closer color location F2.
  • the two color loci f1, f2 are shifted along the straight line g 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 shifted along the straight line g, whereby a color location fg, which initially lies at a boundary of the first color space R1, 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 relevant boundary of the first color space R1.
  • the color locus fg which is originally located on the straight line g at the boundary of the first color space R1
  • the displacement or stretching factor 1 exp (0) (thus preserving the coordinate values) can be provided and for the intermediate color loci, respectively displacement and stretching factors resulting from a Weighting with the exponential function at the two mentioned boundary conditions.
  • the method described above is carried out with arbitrary resolution accuracy for all color loci originally located in the first color space R1.
  • any number of half-lines can be provided which emanate star-shaped 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 second color space. 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 or inner color space corresponding saturation is mapped to the corresponding boundary of the second and larger color space corresponding saturation ,
  • 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 R 1.
  • 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.

Landscapes

  • Illuminated Signs And Luminous Advertising (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Image Processing (AREA)

Claims (9)

  1. Procédé de conversion d'informations de couleurs destiné à la commande d'une source lumineuse,
    selon lequel une information de couleur est transmise d'un premier espace de couleurs (R1) à un deuxième espace de couleurs (R2) plus grand à l'aide d'un système de coordonnées (S),
    caractérisé en ce que
    pour la transmission de l'information de couleur, deux lieux de couleurs différents (f1, f2) à l'intérieur du premier espace de couleurs (R1), qui sont situés dans le système de coordonnées (S) sur une droite (g) passant par un point central (z) du premier espace de couleurs (R1), sont déplacés d'une manière non linéaire le long de la droite (g) par rapport au point central (z).
  2. Procédé selon la revendication 1,
    selon lequel le lieu de couleur (f1), qui est plus éloigné du point central (z) que l'autre lieu de couleur (f2), est déplacé davantage sur la droite (g) que l'autre lieu de couleur (f2).
  3. Procédé selon la revendication 1 ou 2,
    selon lequel les lieux de couleurs (f1, f2) sont déplacés le long de la droite (g) à l'aide d'une fonction mathématique non linéaire, par exemple une fonction exponentielle, une fonction polynomiale ou une fonction échelonnée.
  4. Procédé selon l'une quelconque des revendications précédentes, selon lequel plusieurs lieux de couleurs sont déplacés le long de la droite (g) et, ce faisant, un lieu de couleur (fg), qui était situé à l'origine à une frontière du premier espace de couleurs (R1), est déplacé à un lieu de couleur (fg') qui est situé à la frontière correspondante du deuxième espace de couleurs (R2).
  5. Procédé selon l'une quelconque des revendications précédentes, selon lequel le point central (z) est un point blanc.
  6. Utilisation d'un procédé selon l'une quelconque des revendications précédentes afin de programmer des effets de lumière respectivement des séquences de lumière d'une source lumineuse.
  7. Utilisation selon la revendication 6, selon laquelle la transmission de l'information de couleur est effectuée à l'aide d'un dispositif d'affichage dont l'espace de couleurs est identique au premier espace de couleurs (R1).
  8. Utilisation selon la revendication 7,
    selon laquelle soit le dispositif d'affichage est relié à un PC et la transmission est effectuée en outre à l'aide du PC, soit le dispositif d'affichage est relié à la source lumineuse et la source lumineuse comporte des moyens pour effectuer le procédé.
  9. Utilisation selon l'une des revendications 6 à 8,
    selon laquelle la source lumineuse comporte un espace de couleurs qui est identique au deuxième espace de couleurs (R2).
EP09728413A 2008-04-03 2009-04-03 Conversion d'informations de couleurs pour la commande d'une source lumineuse Active EP2260678B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008017072A DE102008017072A1 (de) 2008-04-03 2008-04-03 Umsetzung von Farbinformationen zur Ansteuerung einer Lichtquelle
PCT/EP2009/002470 WO2009121620A1 (fr) 2008-04-03 2009-04-03 Conversion d'informations de couleurs pour la commande d'une source lumineuse

Publications (2)

Publication Number Publication Date
EP2260678A1 EP2260678A1 (fr) 2010-12-15
EP2260678B1 true EP2260678B1 (fr) 2011-09-07

Family

ID=40852017

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09728413A Active EP2260678B1 (fr) 2008-04-03 2009-04-03 Conversion d'informations de couleurs pour la commande d'une source lumineuse

Country Status (4)

Country Link
EP (1) EP2260678B1 (fr)
AT (1) ATE524051T1 (fr)
DE (1) DE102008017072A1 (fr)
WO (1) WO2009121620A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011009292A1 (de) 2011-01-24 2012-07-26 Vivid Chi Matter And Light Gmbh Verfahren und Vorrichtung zur Steuerung von Farbton und Sättigung von Beleuchtungssystemen
CN110675797B (zh) * 2019-09-25 2023-10-13 深圳Tcl数字技术有限公司 一种色域映射方法、组件、显示装置及存储介质

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0454275B1 (fr) * 1990-04-26 1996-07-03 Bayer Corporation Procédé de séparation des couleurs
DE19506595C1 (de) * 1995-02-24 1996-02-01 Schneider Rundfunkwerke Ag Verfahren zur Farbtransformation und ein Farbvideosystem
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
CA2591205C (fr) 2004-12-20 2015-02-17 Color Kinetics Incorporated Procedes de gestion des couleurs et appareil d'eclairage
JP2006254368A (ja) 2005-03-14 2006-09-21 Canon Inc 色処理装置およびその方法
DE102005028671B4 (de) * 2005-06-17 2007-11-29 Carl Zeiss Jena Gmbh Verfahren zur Einstellung der Farbanteile einer Beleuchtungsanordnung
EP2439727B1 (fr) * 2006-06-02 2017-11-29 Samsung Display Co., Ltd. Appareil d'affichage doté d'un éclairage arrière à plusieurs segments comprenant plusieurs guides de lumière

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Publication number Publication date
WO2009121620A1 (fr) 2009-10-08
EP2260678A1 (fr) 2010-12-15
DE102008017072A1 (de) 2009-10-08
ATE524051T1 (de) 2011-09-15

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