Abstract:
Techniques are disclosed for programming a luminaire position for light-based communication (LCom) luminaires within an array of luminaires using position information provided by passing mobile computing devices. This position information can be received as, for example, as a specific coordinate (e.g., x-y coordinates of a grid-based map) or as movement data of the mobile computing device relative to an initial known reference location. The disclosed techniques can be used, for example, to reduce the time, labor, and expense associated with programming and re-programming a luminaire with a luminaire position, and to increase the flexibility of navigation system installations. In some cases, the disclosed techniques can be used, for example, to improve the precision of a luminaire position programmed into a newly installed luminaire.
Abstract:
Techniques for determining an actual position of a portable device are disclosed. In an embodiment, a two-tier triangulation and wireless beacon-enabled luminaire detection approach is implemented. An estimated position of a device is determined using wireless (e.g., wireless beacon) triangulation based on a signal parameter of a signal received from a wireless access point. The field of view of the portable device may be used to estimate positions of luminaires proximate the portable device. The actual position of the luminaires may be determined from the estimated position by querying a database. A second triangulation may be performed using the known position of the luminaires to determine the position of the portable device with respect to the actual position of the luminaire.
Abstract:
Die Erfindung betrifft eine Beleuchtungseinrichtung (12) zur Kommunikation mit einem mobilen Endgerät (14), umfassend ein Leuchtmittel (13) ein elektronisches Betriebsgerät (11) zum Betreiben des Leuchtmittels (13). Die Beleuchtungseinrichtung (12) weist eine Datenspeichereinheit auf, in der in einem dafür reservierten Speicherbereich ein erster Schlüssel (EKey) gespeichert ist, eine Verschlüsselungseinheit, welche dazu ausgelegt ist, denersten Schlüssel (EKey) aus dem reservierten Speicherbereich auszulesen und Messwertedaten und/oder Identifikationsdaten (ID), welche zur Übertragung an das mobile Endgerät (14) bestimmt sind, gemäß einer vorgebbaren Verschlüsselungsoperation in eine mit dem ersten Schlüssel (EKey) verschlüsselte Nachricht (Code) umzusetzen, und eine Sendeeinheit (13, 16), welche dazu ausgelegt ist, die verschlüsselte Nachricht (Code) an das mobile Endgerät (14) zu senden. Die Erfindung betrifft weiterhin ein Verfahren zum Betreiben einer Beleuchtungseinrichtung (12) durch Kommunikation mit einem mobilen Endgerät (14) durch Speichern eines ersten Schlüssels (EKey) in einem dafür reservierten Speicherbereich einer Datenspeichereinheit der Beleuchtungseinrichtung (12), Auslesen des ersten Schlüssels (EKey) aus dem reservierten Speicherbereich, Umsetzen von Messwertedaten und/oder Identifikationsdaten (ID), welche zur Übertragung an das mobile Endgerät (14) bestimmt sind, gemäß einer vorgebbaren Verschlüsselungsoperation in einer mit dem ersten Schlüssel (EKey) verschlüsselten Nachricht (Code), und Senden der verschlüsselten Nachricht (Code) an das mobile Endgerät (14) durch eine Sendeeinheit (13, 16) der Beleuchtungseinrichtung (12).
Abstract:
Die Erfindung betrifft eine Beleuchtungseinrichtung (12) zur Bereitstellung einer Datenübertragung an ein mobiles Endgerät (14), umfassend ein Leuchtmittel (13) und ein elektronisches Betriebsgerät (11) zum Betreiben des Leuchtmittels. In einer Datenspeichereinheit ist in einem dafür reservierten Speicherbereich ein Satz von ersten Schlüsseln (Key_000 bis Key_lll) gespeichert. Eine Auswahleinheit wählt in Abhängigkeit von einem an einer Datenschnittstelle der Beleuchtungseinrichtung bereitstellbaren Schlüsselwechselsignal und/oder in Abhängigkeit von einem durch einen Schlüsselwechseltaktgeber der Beleuchtungseinrichtung bereitstellbaren beleuchtungseinrichtungsinternen Schlüsselwechselsignal einen ersten Schlüssel aus dem Satz von ersten Schlüsseln aus. Eine Verschlüsselungseinheit liest den ausgewählten ersten Schlüssel aus dem reservierten Speicherbereich aus und setzt Messwertedaten und/oder Identifikationsdaten (ID), welche zur Übertragung an das mobile Endgerät bestimmt sind, gemäß einer vorgebbaren Verschlüsselungsoperation in eine mit dem ausgewählten ersten Schlüssel verschlüsselte Nachricht (Code) um. Eine Sendeeinheit (13, 16) sendet die verschlüsselte Nachricht an das mobile Endgerät. Die Erfindung betrifft weiterhin ein System (100) mit mindestens zwei erfindungsgemäßen Beleuchtungseinrichtungen mit jeweils einem eigenen Satz von ersten Schlüsseln. Die Erfindung betrifft weiterhin ein entsprechendes Verfahren.
Abstract:
Light-based communication (LCom) techniques are disclosed for adaptively adjusting the baud rate of a luminaire to optimize the LCom signal transmitted for an intended receiver device. The adaptive baud rate can be adjusted by a process that includes: determining decoding parameters of the receiver device, the device including a camera for receiving LCom signals, and a display. The process further includes calculating a baud rate suitable for the receiver device based on the decoding parameters, and causing the baud rate to be set at the luminaire. The process may further include at least one of: verifying the baud rate at the receiver device; adjusting the decoding parameters of the receiver device if baud rate cannot be adjusted to meet a current configuration of decoding parameters; and prompting a user to rotate receiver device to improve orientation of the luminaire with respect to a raster direction of the camera.
Abstract:
Techniques are disclosed for projecting visible cues to assist with light-based communication (LCom), the visible cues referred to herein as visual hotspots. The visual hotspots can be projected, for example, using a luminaire that may be LCom-enabled. The visual hotspots may be projected onto the floor of an area including an LCom system. The visual hotspots can be used for numerous benefits, including alerting a potential user that LCom is available, educating the user about LCom technology, and assisting the user in using the LCom signals available in the area. The visual hotspots may include images, symbols, cues, characters (e.g., letters, words, numbers, etc.), indicators, logos, or any other suitable content. In some cases, the visual hotspots may be interactive, such that a user can scan the hotspot to cause an action to occur (e.g., launch an application or website).
Abstract:
Methods and systems are described for sampling an LCom message and accurately decoding the entire LCom message using a light receiver (e.g., digital camera) of a typical mobile computing device, such as a smartphone, tablet, or other mobile computing device. In one embodiment, a curvature method is disclosed to determine LCom signal bit values from a curvature value of a running average calculation of light sensor data. In another embodiment, a signal reconstruction method is disclosed to determine LCom signal bit values from a comparison of modeled data buffers to light sensor data.
Abstract:
Techniques are disclosed for establishing communication between light-based communication (LCom) luminaires within a navigation array of luminaires and mobile computing devices having varying components and processes using an encoding scheme received from passing mobile computing devices. The encoding scheme is a set of rules for encoding and generating a visible-light communication (VLC) signal so that the mobile computing device may recognize VLC signals broadcast by the luminaire. In accordance with some embodiments, the disclosed techniques can be used, for example, to accommodate future computing devices that may incorporate different camera technologies and different processing algorithms to process waveforms in the VLC signals.
Abstract:
Techniques are disclosed for augmenting global positioning system (GPS)-based navigation via light-based communication (LCom). In accordance with some embodiments, a light-sensing device, such as a camera or an ambient light sensor configured as described herein, may be used to detect an LCom signal transmitted by a local LCom-enabled solid-state luminaire. The LCom signal may include data about the location of the transmitting luminaire, and in some cases that location data may be used, for example, in computing the amount of time that it would take to navigate indoors to the luminaire's location. In some instances, GPS data also may be considered to calculate the total trip duration for an entire trip, including time spent indoors and outdoors. In some other cases, the location data and, if available, GPS data may be used, for example, in computing an automotive navigation route.
Abstract:
A method of Light-based Communication (LCom) using camera frame-rate based light modulation is provided. The method includes receiving light having modulated light properties that vary at a first frequency from a LCom-enabled luminaire by an image capture device using a global shutter image capture process, comparing light properties received at the image capture device over sequential image capture instances, and determining, from the compared light properties, data encoded by the modulated light.