Abstract: This invention relates to a method for controlling a light output signal emitted by a set of light sources comprising at least one light source, wherein said light output signal comprises a modulation signal which carries individual information, the method comprising recurrently: remotely detecting the light output signal of said set of light sources; determining at least one quality measure of said remote detection of the light output signal; and adjusting the modulation signal on basis of said at least one quality measure.

Abstract: The present invention relates to a control unit (108) for a lighting system (100) comprising at least two individually controllable light sources (102, 104), wherein the control unit (108) is connectable to the at least two individually controllable light sources (102, 104) and configured to control the at least two individually controllable light sources (102, 104), wherein the control unit (108) is further configured to control a first lighting system configuration comprising the at least two individually controllable light sources (102, 104) so as to cause it to emit a first illumination pattern (120) provided jointly by the at least two light sources (102, 104) of the first lighting system configuration, detect and store an initial set of illumination parameters being indicative of the first illumination pattern (120), determine a subsequent set of illumination parameters being indicative of a second illumination pattern (122) provided by a second lighting system configuration comprising individually cont

Abstract: The invention relates to a detection system for determining whether a light contribution of a light source is present at a selected position within a 2D scene. The light contribution includes an embedded code comprising a repeating sequence of N symbols. The detection system includes a camera and a processing unit. The camera is configured to acquire a series of images of the scene via specific open/closure patterns of the shutter. Each image includes a plurality of pixels, each pixel representing an intensity of the light output of the light source at a different physical position within the scene. The processing unit is configured to process the acquired series of images to determine whether the light contribution of the first light source is present at the selected physical position within the scene by e.g. correlating a sequence of pixels of the acquired series corresponding to the selected physical position with the first sequence of N symbols.

Abstract: The invention relates to a detection system for determining data embedded into the light output of a light source in a form of a repeating sequence of N symbols. The detection system includes a camera and a processing unit. The camera is configured to acquire a series of images of the scene via specific open/closure patterns of the shutter. The processing unit is configured to process the acquired series of images to determine the repeating sequence of N symbols. By carefully triggering when a shutter of the camera is open to capture the different symbols of the encoded light within each frame time of a camera, a conventional camera with a relatively long frame time may be employed. Therefore, the techniques presented herein are suitable for detecting the invisible “high frequency” coded light while using less expensive cameras as those used in the prior art.

Abstract: Commissioning a coded light source in a lighting system is accomplished by using a remote controller. When an identification of a light source is successful, a control message is sent to that light source to at least partly switch off its light emission. Thus the light contribution of the identified light source is suppressed. Thereby the chance of coded light from an already identified light source colliding with identifiers comprised in coded light emitted by other light sources is reduced. When no more coded light is detectable, a sensitivity of the remote controller can be increased until coded light again is detectable. Further light sources can then be identified and commissioned.

Abstract: The invention relates to embedding data into a luminance output generated by an illumination system comprising a light source and a controller. The controller is configured to embed data by modulating a drive signal applied to the light source with an information signal comprising a shifted base code and a synchronization code. The synchronization code serves to provide synchronization for the receiver, while the shifted base code serves to carry the embedded data. A cyclic phase shift that is applied to a base code to generate the shifted base code corresponds to particular data, such as, for example, light source identification, that needs to be embedded into the luminance output of the illumination system. In this manner, data may be embedded into the luminance output generated by a light source without requiring synchronization of this light source with other light sources.

Abstract: Coded light has been proposed to enable advanced control of light sources and transmit information using light sources. An assignment for the identification frequencies of light sources enables more unique frequencies to be assigned, i.e. more light sources to be uniquely identified in the system. An available frequency band is divided into non-uniform frequency regions and frequencies are selected from a set of uniformly spaced frequencies in the non-uniform frequency regions. A receiver is based on a successive approach and is enabled to analyze higher harmonics of the received light signals. The light contributions are successively estimated group by group.

Abstract: Coded light has been proposed to enable advanced control of light sources and transmit information using light sources. Methods, devices and systems configured to operate a coded lighting control system, which is robust to interference from other sources of light are proposed. The method is based on sensing the light by a remote control device, and based on the sensing result adapting the identifiers used by the different light sources. By assigning a code identifier to the light source based on light received by the light receiver the code identifiers may be selected such that the influence of light interfering with the light source identifiers may be mitigated.

Abstract: A vehicle position measurement system (100) and method to determine the (relative) position of a vehicle (110) and an object (120) are proposed. The system comprises at least two light sources (131, 132) capable of emitting light and positioned at a predetermined distance (140) to each other. Furthermore the system comprises at least one detector (150/151, 152) capable of measuring the light emitted. The light emitted by the light sources comprises synchronized light source identification codes. The detector is arranged to determine the position of the vehicle (110) and object (120) on the basis of a phase-difference measurement between the light originating from the individual light sources (131, 132) and a comparison phase. The vehicle (110) may comprise the at least two light sources (131, 132) and the detector (151, 152), while the phase-difference is measured between light reflected from the object (120) and the comparison phase.

Abstract: Coded light has been proposed to enable advanced control of light sources and transmit information using light sources. It is based on invisibly embedding of data and identifiers in their light output. Methods, devices and systems configured to efficient assignment of addresses in a coded lighting system, still allowing for unique identification, are proposed. More specifically, the assignment of addresses occurs in two phases, where in the initial phase wide area unique addresses are used, while in the second phase only local area unique addresses are used. Also, methods, devices and systems configured to efficiently distribute a set of addresses over a set of light sources in this second phase, to maximize the performance of the illumination contribution estimation, and positioning, are disclosed.

Abstract: It is presented a lighting device (2) arranged to embed light quality data in light emanating from the lighting device. The light quality data pertains to a status of the lighting device (2), e.g. with respect to its end of operational life. The light may be detected by a monitoring device (3) external to the lighting device (2). The monitoring device (3) can then help to determine the status of the lighting device (2), whereby maintenance operations of the lighting device (2) may be carried out. Maintenance personnel may thus replace lighting devices and/or light sources in need of maintenance as indicated by the status of each lighting device, before any lighting device in the system has reached an end of operational life.

Abstract: The invention relates to embedding data symbols of a data signal into a luminance output of an illumination device. The device includes a controller configured for receiving a first base pattern and a second base pattern within a frame period, and generating a shifted second pattern by phase shifting the second base pattern within the frame period with respect to the first base pattern in response to the data signal such that the data symbols are embedded in the luminance output of the device. The device also includes a first light source configured to generate a first luminance output in response to the first base pattern and a second light source configured to generate a second luminance output in response to the shifted second pattern. The first and second luminance outputs have different output spectra and the luminance output of the illumination device comprises both the first and second luminance outputs.

Abstract: The invention relates to automatically commissioning of devices of a networked control system, particularly to automatically commissioning (auto-commissioning) of light sources of a lighting system, where a control of light sources on an individual and local basis is required. A basic idea of the invention is to route commissioning messages through a grid, particularly an approximately rectangular grid of devices in that each device is able to receive commissioning messages from and to transmit commissioning messages to directly neighbored devices in the grid via light.

Abstract: The present invention relates to a method and a device for controlling a physical property of light emitted from a light source. In particular, the invention can be applied to a lighting system for atmosphere creation. The measurements needed for feedback control are made at a portable user device comprising a planar photodetector. More or less all industrially available photodetectors are of the planar type, but planarity is in fact a necessary feature to achieve faithful relative measurements. Since the user device is portable, variations in the orientation of the photodetector can introduce large and unpredictable measurement errors, making effective control of the light source impossible. According to one embodiment of the invention, the orientation-dependent errors are eliminated by measuring the actual orientation of the photodetector and processing the detection signal appropriately.

Abstract: There is provided a method for advanced configuration and initialization of a luminaire system. The luminaire system comprises one or more lighting devices (102), an apparatus (104) and a user interface (106). The apparatus comprises a light sensor. One or more of the lighting devices are not connected to a central controller by means of a wired/wireless connection. Therefore, techniques and procedures to use manual interaction 5 by an operator (114) to control these lighting devices are proposed. The proposed techniques enable backward compatible and low-cost implementations of advanced luminaire initialization and configuration. Moreover, this invention proposes to combine the user input, sensing and control functionality into one device, thereby reducing the total cost of implementation and ownership of the proposed system. A corresponding system and 10 apparatus are also presented.

Abstract: The invention relates to a method of monitoring a vital parameter of a patient by measuringattenuation of light emitted onto tissue of the patient, comprising the following steps: modulating the light with a modulation frequency or/and a modulation code; emitting the modulated light onto the tissue of the patient; collecting lightwhich is transmitted through the tissue or/and which is reflected from the tissue; demodulating the collected light; analyzing the demodulated collected light with regard to interference with ambient light; determining amodulation frequency or/and a modulation code for which interference with the ambient light is minimized or falls under a predefined threshold; and setting the modulation frequency or/and the modulation code for modulating the light according to the determined modulation frequency or/and a modulation code for which interference with the ambient light is minimized or falls under a predefined threshold.

Abstract: Proposed is an illumination system (100) comprising a plurality of light sources (10) provided with encoders (20) arranged to enable light emitted from the light sources to comprise light source identification codes. In order to enable light effect commissioning, i.e. correlating the light sources (10) with their illumination footprints (11), the system further comprises a camera (40) arranged to register images of illumination spots (11), and a signal processor (111) arranged to derive the light source identification codes from registered images. Arranging the encoders (20) to modulate the light emitted at a frequency above a predefined high level to comprise fast codes (12) and at a frequency below a predefined low level to comprise slow codes (13), beneficially allows for the use of simple low cost camera systems.

Abstract: Proposed is a light module (110) comprising at least two primary light sources (111,112,113) capable of emitting a primary color light. This allows the light module to emit light having intensity (Y) and color coordinates (x,y) through additive color mixing of the constituent primary colors. The light module further comprises an modulator (115) capable of modulating the primary light sources enabling embedment of data in the light emitted. The modulator (115) is arranged to modulate the color coordinates of the light emitted for embedding the data. This is especially advantageous as the sensitivity of the human eye to changes in color is lower than to changes in intensity. The invention thus advantageously allows embedding the data into the light emitted from the light modules (110) of an illumination system (100) without reducing the performance of its primary function as an aid to human vision.

Abstract: This invention relates to a method for controlling a light output signal emitted by a set of light sources comprising at least one light source, wherein said light output signal comprises a modulation signal which carries individual information, the method comprising recurrently: remotely detecting the light output signal of said set of light sources; determining at least one quality measure of said remote detection of the light output signal; and adjusting the modulation signal on basis of said at least one quality measure.

Abstract: The present invention relates to light-based communication, and more particularly it relates to methods for configuration of at least one remote light-sensing device, to a central light-emitting unit and to a light-sensing device. According to the invention, spatial configuration of remote light-sensing devices (e.g. peripherals such as loudspeakers or light devices), will be achieved by transmission of embedded identifiers or configuration information in light emitted in a plurality of directions from a central light-emitting unit. With a different identifier or different configuration information for each direction of transmission, the directions can be distinguished from each other. The invention enables a user to place remote light-sensing devices in a desired spatial position and the central light-emitting unit will be able to determine location and spatial function, i.e. for example whether the peripheral is an audio device and/or a lighting device.