Color control in subtractive mixing systems

Abstract

A method for controlling a lighting fixture for emitting light having a target color having an subtractive color mixing system, the method comprising: receiving target information indicative of, such as defining, the target color, calculating a target control setpoint for each subtractive filter within the plurality of subtractive filters based on the target information and calibration data, the calibration data for a plurality of sets of calibration control setpoints being indicative of emitted color, and controlling each of the subtractive filters in accordance with each calculated target control setpoint for each of the subtractive filters.

Description

Technical Field

[0001] This invention relates to a method for controlling lighting equipment, and more specifically to a method for controlling a subtractive color mixing system of lighting equipment based on calibration data, and also to a corresponding control device, lighting equipment system, and its application. Background Technology

[0002] Lighting equipment can be used in conjunction with events such as concerts, live performances, television programs, and sporting events to produce a variety of lighting effects and / or ambient lighting, or as architectural lighting equipment to produce a variety of effects.

[0003] Lighting equipment may be expensive, inaccurate in the colors it emits, and inconsistent, such as differences in properties (e.g., one or more colors emitted) between different lighting equipment.

[0004] Therefore, an improved method for controlling lighting equipment, and more specifically, a method for controlling a subtractive color mixing system for lighting equipment (to achieve lower-cost lighting equipment and / or to achieve improved consistency between lighting equipment), as well as the corresponding control device, lighting equipment system, and its application, would be advantageous. Summary of the Invention

[0005] It can be seen that the purpose of this invention is to provide a method and corresponding control device for controlling lighting equipment, a lighting equipment system, and their applications, so as to achieve lower-cost lighting equipment and / or to achieve improved consistency among lighting equipment. Another purpose of this invention is to provide an alternative to the prior art.

[0006] Therefore, the above-mentioned objectives and several other objectives are intended to be achieved in the first aspect of the invention by providing a method for controlling an illumination apparatus having a subtractive color mixing system for emitting light having a target color, the method comprising:

[0007] - Receive instructions, such as the target information specifying the target color.

[0008] - Calculate the target control setpoint for each of the plurality of subtractive color filters based on the following:

[0009] -The target information, and

[0010] - Calibration data, used for multiple sets of calibration control setpoints, indicates the luminous color.

[0011] - Each of the subtractive color filters is controlled according to the target control setpoint calculated for each of the subtractive color filters.

[0012] This invention can particularly, but not exclusively, benefit from taking into account calibration data that can account for the nonlinear characteristics of the color filter and / or deviations from its nominal characteristics (i.e., characteristics different from those provided or estimated by, for example, the manufacturer). This, in turn, may be advantageous for enabling the use of relatively low-cost color filters (and / or color filters with less manufacturing requirements), in which tolerances are relatively high and characteristics therefore vary considerably, while still emitting light with colors that are the same as or relatively close to the target color. Another possible advantage may be that this, in turn, enables the emission of light with colors closer to the target color. Such improvements could be achieved by enabling enhanced consistency between lighting fixtures.

[0013] "Lighting equipment" is understood as an electrical device that includes a (electric) light source providing illumination, such as a lighting system having a light source, wherein the light source, and optionally, one or more optical components, are at least partially encapsulated in a housing. Those skilled in the art of (entertainment) lighting equipment recognize that numerous light effects can be integrated into the lighting equipment. According to an embodiment, a lighting equipment is proposed having one or more of the following: a prism for a prism effect, an iris for an iris effect, frame blades for a frame effect, a frost filter for a frost effect, a device for a dimming effect, an animation wheel for an animation effect, and one or more pattern discs. The (entertainment) lighting equipment can be controlled based on input signals indicating light parameters, which may indicate a target color indicating a decried color of the emitted light, and numerous light effect parameters indicating various light effects. The (entertainment) lighting equipment may include a processor configured to control different light effects of the lighting equipment based on light parameters received via the input signals. For example, (recreational) lighting equipment may include light effects and may be controlled based on various parameters described in WO2010 / 145658 (specifically on page 4, line 11 to page 6, line 9).

[0014] In the context of this application, “light” is generally understood to be visible electromagnetic radiation, such as electromagnetic radiation having wavelengths in the range of 380-780 nm (including both ends).

[0015] A "subtractive color mixing system" is understood as a system used to partially or completely block the transmission of spectral portions of incident light, such as transmission (along the optical path) or reflection (along the optical path), i.e., partially or completely subtracting one or more specific spectral portions (corresponding to spectral portions not transmitted along the optical path). In embodiments, one or more subtractions are achieved by inserting (e.g., gradually inserting) one or more filters into the optical path, such as in a subtractive color mixing system arranged to insert three subtractive tristimulus filters of different degrees (e.g., different degrees of subtraction, such as gradually increasing degrees) independently into the optical path. According to one embodiment, a group of filters of the three primary colors (colors that are transmitted in the case of incident white light) is arranged to perform such color mixing, such as red, green, and blue filters (RGB) or cyan, magenta, and yellow filters (CMY).

[0016] Further improvements could be made by using a color temperature correction filter (CTC), which can be used, for example, to change the color temperature of the white light output.

[0017] Theoretically, any color in the color gamut can be produced by, for example, combining CMY filters to varying degrees. For instance, if a light green is desired, a combination of cyan and yellow filters can be used to partially cover the output of a white light source. The degree to which the aperture is partially filled by a particular filter (and thus the resulting shade of the color) is a parameter called saturation. For example (theoretically), a fully saturated red can be achieved by adding fully saturated magenta and fully saturated yellow. In practice, due to the characteristics of dichroic filters, it is difficult to achieve fully saturated colors by adding two subtractive color filters. In one embodiment, in addition to the color filters used for subtractive mixing, the lighting fixture includes a conventional color wheel on which, for example, red, green, and blue filters are mounted to achieve full saturation of these colors.

[0018] "Color gamut" is understood as a subset of (all) colors that can be accurately represented under given conditions (such as within a given color space), such as using a subtractive color mixing system.

[0019] In implementations, the subtractive color mixing system includes one or more dichroic filters. In high-intensity light projectors used in, for example, the entertainment and architectural lighting industries, the required light source brightness is too high to allow for the use of absorptive color filters to color the light beam. Instead, so-called dichroic filters are used, which reflect the complementary color of the light passing through the filter. Such filters exhibit minimal absorption and are able to withstand the high ambient temperatures and high light throughput characteristic of such projectors.

[0020] "Target color" is understood as the color that the lighting equipment will be used as a target, such as the color desired by the user (e.g., the desired color to be targeted when controlling the lighting equipment to emit a color similar to or the same as the desired target color). Color can be defined with reference to chromaticity and chromaticity (coordinate) systems such as the CIE (International Commission on Illumination) 1931 color space.

[0021] "Receiving target information" can include any form of user input, such as adjustments via physical controls such as knobs or keyboards, or can include analog or digital signals, such as digital input chromaticity and chromaticity coordinates in the CIE 1931 color space.

[0022] "Target information indicating the target color" can be understood as target information that enables the determination of the target color, such as target information that directly defines the target color (e.g., the target information is the coordinates in the CIE 1931 color space) or target information that does not directly define the target color (e.g., the target information is the spectrum of electromagnetic radiation that enables the determination of the corresponding target color).

[0023] "Control setpoint" is understood as a value set by the controller (wherein the terms "controller" and "control device" are used interchangeably throughout this document) to control the color filter of the subtractive color mixing system, for example, "+5 volts" applied to the actuator controlling the position of the color filter in a feedforward control scheme, or "30 mm" in a feedback control scheme.

[0024] "Calibration control setpoint" is understood as a control setpoint that has been used for calibration, such as a control setpoint set by the control device during calibration. For said control setpoint, when each subtractive filter is controlled according to the corresponding calibration control setpoint, the corresponding color of the light emitted from the lighting equipment is measured and stored together with the calibration control setpoint.

[0025] A "control setpoint group" can be understood as a set of values ​​used to control the corresponding color filter group.

[0026] "Calibration data" can be understood as data such as measurement data, which on the one hand has corresponding values ​​for a set of control setpoints, and on the other hand has corresponding values ​​for color and / or spectrum (of the light emitted by the color mixing system). Calibration data can be non-linear, such as the relationship between the control setpoints and / or positions of filters on one side and non-linear color values ​​on the other.

[0027] "Target control setpoint" is understood as the value that is used as the target when pursuing a target color, for example, by a control device.

[0028] In an implementation, the method may further include an optimization (such as fine-tuning) step after controlling each of the subtractive color filters according to a target control setpoint calculated for each of the subtractive color filters, such as for the purpose of reducing the difference between the color of the light emitted by the lighting equipment and the target color.

[0029] According to one implementation scheme, a method is proposed, wherein the method further includes:

[0030] - Obtain calibration data (such as repeatedly obtaining calibration data), wherein obtaining calibration data includes: one or more sets of calibration control setpoints including calibration control setpoints for each subtractive filter, and wherein obtaining calibration data includes:

[0031] - Control each subtractive filter according to the corresponding calibration control setpoint.

[0032] - When each subtractive filter is controlled according to the corresponding calibration control setpoint, the color of the light emitted from the lighting equipment is measured.

[0033] - Store the corresponding values ​​for the following items:

[0034] -The set of calibration control setpoints, and

[0035] - The color of the light emitted from the lighting equipment when each subtractive filter is controlled according to the corresponding calibration control setpoint.

[0036] According to this embodiment, calibration data can be obtained by physically controlling (e.g., positioning) the color filters and measuring the corresponding spectral information. The measuring device may include optionally portable integrating spheres and spectrometers (e.g., including handles and / or shock-absorbing elements and / or features for changing dimensions, such as features for reversible disassembly and reassembly). An advantage of this embodiment is that it ensures that the true characteristics of the color filters, individually or in combination, and / or the true characteristics of the lamp used by the lighting equipment to provide incident light to the subtractive color mixing system are taken into account. Another possible advantage is that the obtained calibration data can be used to update calibration data, which may be relevant, for example, due to drift or replacement of parts. According to this embodiment, the color of the emitted light is determined and stored, such as stored in the lighting equipment, for example, in an electronically readable storage unit within the lighting equipment.

[0037] The steps described above for obtaining calibration data can be performed as an embodiment of the present invention and / or as a separate, independent step.

[0038] "Measuring the color of light emitted from an illumination device when each subtractive filter is controlled according to the corresponding calibration control setpoint" can be understood as measuring color (directly) using a colorimeter (such as at a point or with an integrating sphere).

[0039] "Measuring the color of light emitted from the lighting equipment when controlling each subtractive filter according to the corresponding calibration control setpoint" can be alternatively understood as measuring color (indirectly) through the following:

[0040] - When controlling each subtractive filter according to the corresponding calibration control setpoint, measure the spectral information of the light emitted from the lighting equipment (e.g., using a spectrometer, such as in a point or with an integrating sphere).

[0041] Based on the spectral information, determine the color of the light emitted from the lighting equipment when each subtractive filter is controlled according to the corresponding calibration control setpoint.

[0042] In any case, the implementation may include (directly) measuring and storing color, or (indirectly) measuring and storing (calculated) color and / or spectral information by measuring spectral information.

[0043] According to one implementation scheme, a method is proposed, wherein the method further includes:

[0044] - Obtain calibration data (such as repeatedly obtaining calibration data), wherein obtaining calibration data includes: one or more sets of calibration control setpoints including calibration control setpoints for each subtractive filter, and wherein obtaining calibration data includes:

[0045] - Control each subtractive filter according to the corresponding calibration control setpoint.

[0046] - When each subtractive filter is controlled according to the corresponding calibration control setpoint, the spectral information of the light emitted from the lighting equipment is measured.

[0047] - Store the corresponding values ​​for the following items:

[0048] -The set of calibration control setpoints, and

[0049] - The spectral information of the light emitted from the lighting equipment when each subtractive filter is controlled according to the corresponding calibration control setpoint.

[0050] Although this implementation stores spectral information instead of color, it can be considered similar to the aforementioned implementations and can apply the same advantages. It can be combined with the previous implementations to store both color and spectral information. One advantage of storing spectral information is that it allows for the interchangeability of components, such as one or more color filters and / or lamps used to provide incident light, while still allowing the user to benefit from the characteristics of the remaining components whose spectral information is acquired and stored.

[0051] The steps described above for obtaining calibration data can be performed as an embodiment of the present invention and / or as a separate, independent step.

[0052] According to one implementation, a method is proposed in which calibration data includes a number of N sets of calibration control setpoints, the number being 1 or greater.

[0053] According to one implementation, a method is proposed where calibration data includes N sets of calibration control setpoints (such as each calibration control setpoint being associated with a color point different from the others), the number being 2 or greater, such as 3 or greater, such as 4 or greater, such as 5 or greater, such as 6 or greater, such as 8 or greater, such as 10 or greater, such as 30 or greater, such as 100 or greater, such as 200 or greater, such as 300 or greater, such as 500 or greater, such as 750 or greater, such as 1000 or greater. The advantage of using more points may be that it achieves improved resolution in the color space, such as making the typical or maximum distance between the measurement point and the target color relatively small, such as improving non-linear resolution to provide higher accuracy in the color space.

[0054] According to another embodiment, a method is proposed in which multiple sets of calibration control setpoints include a set of calibration control setpoints, wherein each calibration control setpoint corresponds to a substantially zero (e.g., zero) subtraction of light by the corresponding subtractive color filter. According to this embodiment, there may be substantially zero (e.g., zero) subtraction from each filter, i.e., the corresponding data point represents incident light, such as light from a light source or lamp of an lighting device. This may allow data such as measurement results to be split into contributions from the light source and from the color filter.

[0055] According to yet another implementation, a method is proposed in which multiple sets of calibration control setpoints include a set of calibration control setpoints for each of a plurality of subtractive color filters, wherein:

[0056] - The calibration control setpoint of the subtractive filter corresponds to a non-zero light level, such as substantial subtraction, and

[0057] - The calibration control setpoint of all other subtractive filters within a plurality of subtractive filters corresponds to a subtraction of light that is essentially zero, such as zero.

[0058] According to this implementation, in addition to one color filter, there may be essentially zero (such as zero) subtraction from all color filters, meaning the corresponding data point represents the effect of incident light and subtraction from only one color filter. This allows data such as these measurements to serve as interfaces between different color gamut regions.

[0059] According to yet another implementation, a method is proposed in which multiple sets of calibration control setpoints include one or more sets of mixed calibration control setpoints, wherein:

[0060] - Such as including two or more calibration control setpoints, each corresponding to a non-zero light, such as substantial subtraction.

[0061] According to this implementation, there may be essentially zero (e.g., zero) subtraction from more than one (e.g., two, or two and only two) color filters, i.e., the subtraction effect from multiple (e.g., two and only two) color filters corresponding to the incident light at the corresponding data point. This could be beneficial for improving the resolution of calibration data points in the color space, which in turn could potentially benefit the possibility of accurately generating emitted light with the (desired) target color even if the target color differs from the color of the calibration data point.

[0062] According to another embodiment, a method is proposed in which multiple sets of calibration control setpoints include multiple mixed calibration control setpoints, wherein:

[0063] - Such as including two or more calibration control setpoints, each corresponding to a non-zero light, such as substantial subtraction.

[0064] And among them

[0065] - The corresponding colors of light emitted from lighting equipment according to multiple sets of mixed calibration control setpoints have different distances relative to each setpoint and the corresponding subtractive filter for light that is essentially zero, such as zero subtraction.

[0066] According to this implementation, the calibration data may include multiple hybrid calibration control setpoints, wherein multiple (such as two and only two) color filters are inserted into the optical path, and wherein the resulting colors have color points at different distances relative to the color point of the light source (without a color filter inserted). The advantage of this is that it may be beneficial for improving the resolution of the calibration color point in the color space.

[0067] According to another embodiment, a method is proposed in which, for a mixed set of calibration control setpoints having corresponding luminous colors at different distances in a color space, two identical calibration control setpoints are non-zero, such as positions where only these two calibration control setpoints are non-zero. According to this embodiment, the resulting colors, having different distances from the color point of the light source (without a color filter inserted), are placed in a color space such as the CIE 1931 color space between lines drawn between points where only one color filter is inserted in the optical path. The advantage of doing so is that it may be beneficial for improving the resolution of calibration data points in the color space.

[0068] According to one implementation, a method is proposed in which calculating the target control setpoint for each of a plurality of subtractive color filters involves interpolation between a set of calibration control setpoints. "Interpolation" can be understood as estimating the target control setpoint of the target color from one or more control setpoints of colors on at least two sides of the target color in a color space such as the CIE 1931 color space. The advantage of this is that the target control setpoint can be estimated even when a corresponding control setpoint is not present in the calibration data.

[0069] According to one implementation plan, a method is proposed, which includes...

[0070] - Generation of a point set mesh in the color space based on calibration data, where calibration data points (such as color points corresponding to the calibration control setpoint group) form vertices.

[0071] - Methods such as determining whether a target color is within a grid polygon by optionally repeating the application of a method to determine this, such as the minimum grid polygon, are used to determine the grid polygon containing the target color.

[0072] - Interpolation, such as interpolating vertices within a grid polygon based on the grid polygon, to achieve a target control setpoint.

[0073] According to another implementation, point set mesh generation is point set triangulation.

[0074] According to another implementation, the point set mesh generation results in quadrilateral (four-sided) polygons. Mathematics provides an analytical solution for polygons with four points (e.g., for filters A and B and quadrilateral polygons with corners, i.e., A+B out, A in, B in, A+B in).

[0075] According to an alternative implementation, a method is proposed in which the calculation of target control setpoints for each of a plurality of subtractive filters includes a meshless approach. A “meshless approach” is understood as a method that does not require connections between nodes in the simulation domain (i.e., a mesh), but rather, for example, is based on the interaction of each node with some or all of its neighboring elements, such as using nearest-neighbor interpolation and / or using smoothed particle hydrodynamics (SPH).

[0076] According to a second aspect of the invention, a control device for controlling a subtractive color mixing system of lighting equipment is provided, wherein the subtractive color mixing system includes a plurality of adjustable subtractive color filters, and wherein the control device is arranged as follows:

[0077] - Receive instructions, such as the target information specifying the target color.

[0078] - Calculate the target control setpoint for each of the plurality of subtractive color filters based on the following:

[0079] -The target information, and

[0080] - Calibration data, used for multiple sets of calibration control setpoints, indicates the luminous color.

[0081] - The calculated target control setpoints are output so that each of the subtractive color filters can be controlled based on the calculated target control setpoints for each of the subtractive color filters.

[0082] The control device can be operatively connected to the subtractive color mixing system and optionally physically connected (e.g., within the lighting fixture). The control device can be embedded electronics, such as a processor and memory, and an input / output (I / O) system.

[0083] According to one embodiment, a control device is proposed, which further includes or is operatively connected to:

[0084] - Storage unit, including information corresponding to calibration data.

[0085] A storage unit may be a unit that includes a suitable medium, such as a computer-readable medium, such as an electronically accessible memory integrated circuit chip, such as an optical storage medium or a solid-state medium, such as an optical storage medium or a solid-state medium provided together with or as part of other hardware (such as a hard disk drive (HDD)).

[0086] According to the third aspect, a lighting equipment system is proposed, which includes:

[0087] - Lighting equipment, the lighting equipment including

[0088] -light source,

[0089] - A subtractive color mixing system, wherein the subtractive color mixing system includes a transducer for controlling the subtractive color filter upon receiving a target control setpoint, and

[0090] -According to the control device of the second aspect, wherein the control device is operatively connected to the subtractive color mixing system and is arranged to control the subtractive color mixing system by outputting a calculated target control setpoint to the transducer controlling the corresponding subtractive color filter.

[0091] According to one implementation plan, multiple lighting fixture systems are proposed, wherein calibration data differ between one or more pairs of lighting fixture systems.

[0092] According to one embodiment, a lighting equipment system is proposed, the lighting equipment system further comprising:

[0093] - A colorimeter or spectrometer, wherein the illumination device is arranged to emit light toward the colorimeter or spectrometer.

[0094] -(The colorimeter or spectrometer optionally includes) an integrating sphere, wherein the illumination device is arranged to emit light toward the input port of the integrating sphere, such that the emitted light is transmitted to the colorimeter or spectrometer via the integrating sphere.

[0095] Furthermore, the control device is also arranged (e.g., in calibration mode) to acquire calibration data, wherein acquiring calibration data includes one or more sets of calibration control setpoints for each subtractive color filter.

[0096] - Control each subtractive filter according to the corresponding calibration control setpoint.

[0097] - When each subtractive filter is controlled according to the corresponding calibration control setpoint, the color of the light emitted from the lighting equipment is measured (e.g., directly with the colorimeter, or indirectly via the spectrum of a spectrometer from which the color is calculated) or spectral information is measured using the colorimeter or spectrometer.

[0098] - Store the corresponding values ​​for the following items:

[0099] - The calibration group for controlling the setpoint, and

[0100] - The color (such as the color from the colorimeter or the color calculated from the spectral information from the spectrometer) and / or spectral information of the light emitted from the lighting equipment when each subtractive filter is controlled according to the calibration control setpoint group.

[0101] According to one embodiment, the lighting equipment system is arranged to repeatedly acquire calibration data, such as for the purpose of continuous updating (and / or improving resolution).

[0102] A calibration device is also proposed, comprising:

[0103] - A colorimeter or spectrometer, wherein the illumination device is arranged to emit light toward the colorimeter or spectrometer.

[0104] -(The colorimeter or spectrometer optionally includes) an integrating sphere, wherein the illumination device is arranged to emit light toward the input port of the integrating sphere, such that the emitted light is transmitted to the colorimeter or spectrometer via the integrating sphere.

[0105] - The control device is also arranged (e.g., in calibration mode),

[0106] - Control each subtractive filter of the lighting equipment associated with the subtractive mixing system according to the corresponding calibration control setpoint.

[0107] - Obtain calibration data, wherein obtaining calibration data includes one or more sets of calibration control setpoints for each subtractive color filter.

[0108] - When each subtractive filter is controlled according to the corresponding calibration control setpoint, the color of the light emitted from the lighting equipment is measured (e.g., directly with the colorimeter, or indirectly via the spectrum of a spectrometer from which the color is calculated) or spectral information is measured using the colorimeter or spectrometer.

[0109] - Store the corresponding values ​​for the following items:

[0110] - The calibration group for controlling the setpoint, and

[0111] - The color (such as the color from the colorimeter or the color calculated from the spectral information from the spectrometer) and / or spectral information of the light emitted from the lighting equipment when each subtractive filter is controlled according to the calibration control setpoint group.

[0112] In implementation schemes, the colorimeter and / or spectrometer can be located either outside or inside the lighting fixture (e.g., surrounded by a lamp housing). The advantage of placing it outside the lighting fixture is that it can be easily removed after use and / or reduces the weight and cost of the lighting fixture. The advantage of placing it inside the lighting fixture is that it allows for a compact and integrated solution for calibrating the lighting fixture (including calibration during and after use).

[0113] According to one embodiment, the method includes: measuring spectral information of light emitted from the lighting equipment using the spectrometer when each subtractive filter is controlled according to the corresponding calibration control setpoint; further comprising determining, based on the spectral information, the color of light emitted from the lighting equipment when each subtractive filter is controlled according to the corresponding calibration control setpoint; and further comprising storing corresponding values ​​of a calibration set of control setpoints, and the color (such as the color calculated from the spectral information from the spectrometer) and / or spectral information of light emitted from the lighting equipment when each subtractive filter is controlled according to the corresponding calibration control setpoint set.

[0114] According to the fourth aspect, the use of the lighting equipment system according to the third aspect for emitting target colors is proposed. Attached Figure Description

[0115] The first, second, third, and fourth aspects of the invention will now be described in more detail with reference to the accompanying drawings. The drawings illustrate one mode of implementing the invention and should not be construed as limiting of other possible embodiments falling within the scope of the appended claims.

[0116] Figure 1 A flowchart of the method according to the present invention is shown.

[0117] Figure 2 A structural diagram of the lighting device is shown.

[0118] Figure 3 A structural diagram of a moving head lighting device is shown.

[0119] Figure 4 The triangulation point set of the color points in the calibration dataset is shown.

[0120] Figure 5 An overview of the lighting equipment system is shown. Detailed Implementation

[0121] Figure 1 A flowchart of a method 100 according to the present invention is shown, the method being used to control an illumination device having a subtractive color mixing system for emitting light having a target color, the method comprising:

[0122] - Receive (102) target information indicating (such as defining) the target color,

[0123] - Calculate the target control setpoint (104) for each of the multiple subtractive color filters based on the following:

[0124] -The target information, and

[0125] - Calibration data, used for multiple sets of control setpoints, indicates the luminous color.

[0126] - Each of the subtractive color filters 106 is controlled according to a target control setpoint calculated for each of the subtractive color filters.

[0127] Figure 2A structural diagram of a lighting device 200 is shown (wherein, throughout this application, "lighting device" and "lighting apparatus" can be understood interchangeably). The lighting device includes a cooling module 201 comprising a plurality of LEDs 103 (which in alternative embodiments may be one or more discharge bulbs), a light collector 241, a shutter 242, and an optical projection and zoom system 243. The cooling module is disposed in the bottom portion of a lamp housing 248 of the lighting device, and other components are disposed inside the lamp housing 248. The lamp housing 248 may be provided with a plurality of openings 250. The light collector 241 is adapted to collect light from the LEDs 103 and convert the collected light into a plurality of beams 245 (dotted lines) propagating along an optical axis 247 (dotted line). The light collector may be embodied as any optical device capable of collecting at least a portion of the light emitted by the LEDs and converting the collected light into beams. In the illustrated embodiment, the light collector includes a plurality of small lenses, each small lens collecting light from one of the LEDs and converting the light into a corresponding beam. However, it should be noted that the light collector can also be implemented as a single optical lens, a Fresnel lens, multiple TIR lenses (total internal reflection lenses), multiple light bars, or a combination thereof. It should be understood that a beam propagating along the optical axis includes rays propagating at an angle, such as less than 45 degrees relative to the optical axis. The light collector can be configured to fill the shutter 242 with light from the light source 103, such that an area of ​​shutter 242 (i.e., the aperture) is illuminated with uniform intensity, or the area of ​​shutter 242 is optimized for maximum output. The shutter 242 is arranged along the optical axis 247. The optical projection system 243 can be configured to collect at least a portion of the beam transmitted through the shutter 242 and image the shutter at a distance along the optical axis. For example, the optical projection system 243 can be configured to image the shutter 242 onto an object (such as a screen, e.g., a screen on a concert stage). Specific images, such as opaque patterns provided on a transparent window, open patterns in non-transparent materials, or imaging objects like GOBOs known in the field of entertainment lighting, can be included within gate 242, allowing the illuminated image to be imaged by an optical projection system. Thus, lighting device 200 can be used for entertainment lighting. In the illustrated embodiment, light is guided by light collector 241 along optical axis 247 and passes through various light effects before exiting the lighting device via front lens 243a. For example, the light effects can be any light effect known in the field of smart / entertainment lighting, such as CMY subtractive color mixing system 251, filter 253, light shield 255, animation effect 257, iris effect 259, focusing lens group 243c, zoom lens group 243b, prism effect 261, frame effect (not shown), or any other light effect known in the art. The light effects mentioned are only for illustrating the principles of lighting devices for entertainment lighting, and those skilled in the art of entertainment lighting will be able to construct other variations with additional or fewer light effects.In addition, it should be noted that the order and position of the light effects can be changed.

[0128] Figure 3 A structural diagram of a moving head lighting device 302 is shown, the moving head lighting device including a head 200 rotatably connected to a yoke 363, wherein the yoke is rotatably connected to a base 365. The head and... Figure 2 The lighting devices shown are essentially the same, and the essentially the same features are due to... Figure 2The same reference numerals are used throughout and will not be described further. The moving head lighting device includes a rocking rotation mechanism for rotating the yoke relative to the base, for example, by rotating a rocking shaft 367 connected to the yoke and arranged in the base. A rocking motor 369 is connected to the shaft 367 via a rocking belt 371 and is configured to rotate the shaft and yoke relative to the base via the rocking belt. The moving head lighting device includes a tilting rotation mechanism for rotating the head relative to the yoke, for example, by rotating a tilting shaft 373 connected to the head and arranged in the yoke. A tilting motor 375 is connected to the tilting shaft 373 via a tilting belt 377 and is configured to rotate the shaft and head relative to the yoke via the tilting belt. Those skilled in the art will recognize that the rocking and tilting rotation mechanisms can be constructed in many different ways using mechanical components such as motors, shafts, gears, cables, chains, transmission systems, bearings, etc. Alternatively, it should be noted that the rocking motor can also be arranged in the base and / or the tilting motor can be arranged in the head. The space 379 between the yoke and the bottom portion of the head is limited because the moving head lighting device is designed to be as small as possible. As known in the prior art, the moving head lighting device receives electrical power 381 from an external power source (not shown). This electrical power is received by an internal power source 383, which adapts and distributes the power to the subsystems of the moving head via an internal power line (not shown). The internal power system can be constructed in many different ways, for example, by connecting all subsystems to the same power line. However, those skilled in the art will recognize that some subsystems in the moving head require different types of power supplies, and a ground wire may also be used. For example, in most applications, the light source will require a power supply of a different type than that of the stepper motor and driver circuitry. The lighting device also includes a controller 385 that controls components (other subsystems) in the lighting device based on input signals 387 indicating light effect parameters, position parameters, and other parameters related to the moving head lighting device. The controller receives the input signals, for example, from light controllers (not shown) known in the field of smart and entertainment lighting using standard protocols such as DMX, ArtNET, and RDM. Typically, light effect parameters indicate at least one light effect parameter related to different light effects in the light system. The controller 385 is adapted to send commands and instructions to different subsystems of the mobile head via internal communication lines (not shown). The internal communication system can be based on various types of communication networks / systems. The mobile head may also include a user input device that allows a user to interact directly with the mobile head, rather than communicating with it using an optical controller. The user input device 389 may be, for example, a bottom, joystick, touchpad, keyboard, mouse, etc. The user input device may also be supported by a display 391, enabling the user to interact with the mobile head using the user input device through a menu system shown on the display.In one implementation, the display device and the user input device can also be integrated into a touch screen.

[0129] Figure 4 The figure shows a triangulation point set 400 in the CIE 1931 color space (color points in the calibration dataset), containing multiple points from the calibration dataset, each representing the color of light emitted from one of four illuminators (illuminators named "Instrument 1018", "Instrument 1016", "Instrument 1017", and "Instrument 1012", see the legend in the figure) when each subtractive filter in the illuminator is controlled according to the corresponding calibration control setpoint. The figure also shows the black body line 420 as a fully drawn line. The achievable color gamut is defined by the outer edge of the measurement points, which is shown as a thick, fully drawn line 422.

[0130] In addition, point set mesh generation has been performed in the color space for an instrument (“instrument 1012”) based on calibration data, such as calibration data points forming vertices, wherein point set mesh generation is point set triangulation.

[0131] For example, a subtractive color mixing system may include three color filters, and the point grid generation is triangulated, wherein any grid polygon includes vertices of no more than two filters inserted into the optical path. Figure 4 Such an implementation is depicted, in which (for four lighting fixtures) a subtractive CMY (cyan, magenta, yellow) color mixing system has been calibrated to give the depicted triangulated point set. For each combination of two filters in a group with three filters (i.e., three combinations), Figure 4 The calibration data includes any combination of 5 possible settings for each filter, i.e., multiple sets of calibration control setpoints including 75 sets (e.g., 3 combinations of two filters and 5 by 5 settings for each filter combination, i.e., 3x5^2 sets). Figure 4 A filterless calibration control setpoint 402 is shown, where each calibration control setpoint corresponds to a corresponding subtractive color filter that results in essentially zero, such as zero, color reduction of the light—essentially the color of the lamp in the lighting equipment—located on or near the blackbody line 420 in this example. For each of the plurality of subtractive color filters, Figure 4The calibration data also includes a set of calibration control setpoints, where the calibration control setpoints for the subtractive color filters correspond to non-zero (e.g., substantial) subtraction of light, and the calibration control setpoints for all other subtractive color filters within a plurality of subtractive color filters correspond to substantially zero (e.g., zero) subtraction of light, such as a set of calibration control setpoints where only one color filter is fully inserted (e.g., inserted to the maximum extent possible in a particular implementation) in the optical path, such as yellow filter calibration control setpoint 404 (only yellow filter fully inserted), cyan filter calibration control setpoint 406 (only cyan filter fully inserted), and magenta filter calibration control setpoint 408 (only magenta filter fully inserted). Each dashed line 410a, 410b, 410c shows a line in the color space corresponding to a gradual increase in the insertion of a single color filter (away from the calibration control setpoint 402 without a filter). Figure 4 Color points corresponding to the mixed calibration control setpoint groups are also shown, where each of the multiple calibration control setpoints corresponds to a non-zero (e.g., substantial) subtraction of light, such as a first color point 414 and a second color point 416. Furthermore, the corresponding colors of light emitted from the lighting apparatus according to the multiple sets of mixed calibration control setpoints (e.g., referring to the first color point 414 and the second color point 416) have different distances in the color space relative to the color corresponding to the substantially zero (e.g., zero) subtraction of light by the corresponding subtraction filter for each setpoint (refer to the filterless color point 402). In other words, the first color point 414 is closer to color point 402 than color point 416. Furthermore, for a mixed calibration control setpoint group having corresponding luminous colors at different distances in the color space, the same two calibration control setpoints are non-zero (such as for these two calibration control setpoints, the same two filters are inserted in the optical path), such as only these two control calibration setpoints are non-zero, such as two corresponding color points 414, 416 are between the same two dashed lines such as lines 410a, 410b.

[0132] Figure 4 An exemplary target color is also shown, as indicated by star 418, which does not coincide with the color of a set of calibration control setpoints (e.g., the star does not coincide with any circular markers, but is located inside a triangle or on the edge between circular markers, and in this example, is completely placed inside a triangle in a triangulated mesh).

[0133] According to one implementation, calculating the target control setpoint for each of a plurality of subtractive color filters based on target information and calibration data indicating the emission color for multiple sets of calibration control setpoints may include identifying a set of calibration control setpoints with a corresponding color closest to the target color, and setting the target control setpoint for each color filter to be equal to the corresponding calibration control setpoint of said (closest) set of calibration control setpoints. This may be advantageous for its simplicity (e.g., making dot grid generation redundant) and may be particularly effective for high-resolution calibration data (such as calibration data with a large number of calibration control setpoints whose colors are uniformly distributed in the color space) and / or situations where the requirements for (accurate) color reproduction are relatively relaxed. In another implementation, calculating the target control setpoint for each of the multiple subtractive color filters based on target information and calibration data indicating the luminous color for multiple sets of calibration control setpoints may include identifying a group of calibration control setpoints(s) of corresponding colors having the closest (or most recent) target color, and setting the target control setpoint for each color filter based on the (nearest) calibration control setpoint group, such as by relying on nearest neighbor interpolation.

[0134] According to another embodiment, calculating the target control setpoint for each of a plurality of subtractive color filters may include determining, for example, the minimum grid polygon that includes the target color (after point grid generation) by optionally repeatedly applying methods for determining whether the target color is within a grid polygon. After identifying the (minimum) grid polygon that includes the target color, the target control setpoint is identified by interpolation, such as performing linear trigonometric interpolation within the grid polygon based on the vertices of the grid polygon to achieve the target control setpoint. For example, each vertex may be associated with three scalar values ​​corresponding to the calibration control setpoint for each filter, and linear trigonometric interpolation may be performed on the calibration control setpoint for each filter to obtain a set of target control setpoints with the target control setpoint for each filter.

[0135] According to another implementation scheme, the set of target control setpoints can be obtained by any means, such as nonlinear interpolation that takes multiple points on either side into account, extrapolation through multiple points, etc.

[0136] Figure 5An overview of a lighting system 500 is shown, the lighting system comprising: lighting fixtures having a light source; a subtractive color mixing system, wherein the subtractive color mixing system includes a transducer for controlling a subtractive color filter upon receiving a target control setpoint; and a control device 502, wherein the control device is operatively connected to the subtractive color mixing system and arranged to control the subtractive color mixing system by outputting a calculated target control setpoint to a transducer controlling a corresponding subtractive color filter. More specifically, control device 502 continuously sets and submits control setpoints for each color filter in the subtractive color mixing system of lighting device 506 to lighting device 506 via interface 504 (e.g., a USB to DMX interface, which is a serial digital interface adapter for connecting a computer to one or more devices). The lighting device then emits light 508 accordingly, and integrating sphere 510 is arranged to receive the light 508 emitted from the lighting device. Thus, software is used (via interface 504) to control lighting device 506 and measuring equipment, enabling spectral measurements for various configurations of subtractive color filters. The measurement results can form calibration measurement results, which are sent from integrating sphere 510 to control device 502, which can then determine the color and triangulate the color space accordingly. Subsequently, the control device can use the calibration data to (e.g., via a color engine algorithm) determine one or more control setpoints that produce one or more target colors.

[0137] Although the invention has been described in conjunction with specified embodiments, it should not be construed in any way as being limited to the examples presented. The scope of the invention is set forth by the appended claims. In the context of the claims, the terms “comprising” or “including” do not exclude other possible elements or steps. Similarly, references such as “a” or “an” should not be construed as excluding multiple elements. The use of reference numerals in the claims relating to elements indicated in the drawings should also not be construed as limiting the scope of the invention. Furthermore, various features referred to in different claims may be advantageously combined, and references to these features in different claims do not preclude the possibility and advantage of combining features.

Claims

1. A method (100) for controlling an anachromatic mixing system of a lighting fixture for emitting light having a target color, the anachromatic mixing system comprising a plurality of anachromatic filters, the method comprising: - receiving (102) target information defining the target color, - computing (104) a target control setpoint for each anachromatic filter within the plurality of anachromatic filters based on: - the target information, - calibration data, the calibration data for a plurality of sets of calibration control setpoints indicating colors of light emitted by the lighting fixture, identifying a set of calibration control setpoints having a corresponding color closest to the target color, and setting the target control setpoint for each filter equal to the corresponding calibration control setpoint of the closest set of calibration control setpoints, - controlling (106) each of the anachromatic filters according to each computed target control setpoint of each of the anachromatic filters.

2. The method (100) of claim 1, wherein the method further comprises: - obtaining the calibration data, wherein obtaining calibration data comprises, for one or more sets of calibration control setpoints comprising a calibration control setpoint for each anachromatic filter: - controlling each anachromatic filter according to a respective calibration control setpoint, - measuring a color of light emitted from the lighting fixture when each anachromatic filter is controlled according to the respective calibration control setpoint, - storing corresponding values of: - the set of calibration control setpoints, and - the color of light emitted from the lighting fixture when each anachromatic filter is controlled according to the respective calibration control setpoint.

3. The method (100) of claim 1, wherein the method further comprises: - obtaining calibration data, wherein obtaining calibration data comprises, for one or more sets of calibration control setpoints comprising a calibration control setpoint for each anachromatic filter: - controlling each anachromatic filter according to a respective calibration control setpoint, - measuring spectral information of light emitted from the lighting fixture when each anachromatic filter is controlled according to the respective calibration control setpoint, - storing corresponding values of: - the set of calibration control setpoints, and - the spectral information of light emitted from the lighting fixture when each anachromatic filter is controlled according to the respective calibration control setpoint.

4. The method of any preceding claim, wherein the calibration data comprises a number N of sets of calibration control setpoints, the number being 2 or more.

5. The method of claim 4, wherein the plurality of sets of calibration control setpoints comprises the set of calibration control setpoints, each calibration control setpoint of the set of calibration control setpoints corresponding to a zero anachromatism of light by a corresponding anachromatic filter.

6. The method of any of claims 4 to 5, wherein the plurality of sets of calibration control setpoints comprises a set of calibration control setpoints for each of a plurality of anachromatic filters, wherein: - the calibration control setpoints of the anachromatic filter correspond to a non-zero substantial anachromatism of light, and - the calibration control setpoints of the anachromatic filter correspond to a zero anachromatism of light. - the calibration control setpoints of all other subtractive color filters within the plurality of subtractive color filters correspond to a zero of the subtractive of light.

7. The method (100) according to any one of claims 4 to 6, wherein the plurality of sets of calibration control setpoints comprises one or more sets of mixed calibration control setpoints, wherein: - the plurality of calibration control setpoints comprising or consisting of two each correspond to a non-zero substantial subtractive of light.

8. The method (100) according to any one of the preceding claims, wherein calculating the target control setpoint for each subtractive color filter within the plurality of subtractive color filters comprises interpolating between sets of calibration control setpoints.

9. A control device (502) for controlling a subtractive mixing system (251) of a lighting fixture (506) for emitting light having a target color, wherein the subtractive mixing system comprises a plurality of adjustable subtractive color filters, and wherein the control device is arranged to: - receive target information indicative of a target color, - calculate a target control setpoint for each subtractive color filter within the plurality of subtractive color filters based on: - the target information, and - calibration data, the calibration data for a plurality of sets of calibration control setpoints being indicative of colors emitted by the lighting fixture, and identifying a set of calibration control setpoints having a corresponding color closest to the target color, and setting the target control setpoint of each filter to be equal to the corresponding calibration control setpoint of the nearest set of calibration control setpoints, - control each of the subtractive color filters according to each calculated target control setpoint of each of the subtractive color filters.

10. The control device (502) according to claim 9, further comprising: - a storage unit comprising information corresponding to the calibration data.

11. A lighting fixture system (500) comprising: - a lighting fixture (506) comprising - a light source, - a subtractive mixing system comprising a plurality of adjustable subtractive color filters, wherein the subtractive mixing system comprises transducers for controlling the subtractive color filters upon receiving a target control setpoint, and - a control device (502) according to any one of claims 9 to 10, wherein the control device is operably connected to the subtractive mixing system and arranged to control the subtractive mixing system by outputting the calculated target control setpoint to the transducers controlling the respective subtractive color filters.

12. The lighting fixture system (500) according to claim 11, further comprising: - a colorimeter or spectrometer (510), wherein the lighting fixture is arranged to emit light to the colorimeter or the spectrometer, and wherein the control device (502) is further arranged in a calibration mode to obtain calibration data, wherein for one or more sets of calibration control setpoints comprising calibration control setpoints of each subtractive color filter, the obtaining calibration data comprises: - controlling each subtractive color filter according to the respective calibration control setpoint, - measuring the color or spectral information of the light emitted from the lighting fixture with said colorimeter or spectrometer, respectively, when controlling each subtractive filter according to said respective calibration control setpoint, - storing corresponding values of: - the calibration set of control setpoints, and - the color and / or spectral information of the light emitted from the lighting fixture when controlling each subtractive filter according to said calibration control setpoint set.

13. Use of a lighting fixture system (500) according to any one of claims 11-12 for emitting a target color.

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