An apparatus and method employing sensor-based luminaires to detect areas of reduced visibility and their direction of movement

Patent metadata

Field	Value
Publication number	US-2016148506-A1
Application number	US-201414900216-A
Country	US
Kind code	A1
Filing date	Jun 6, 2014
Priority date	Jun 26, 2013
Publication date	May 26, 2016
Grant date	—

Abstract

A method and system that relies on visibility detectors deployed on luminaires in outdoor lighting networks (OLNs) to independently treat and consolidate the sensed data in a fault-tolerant manner. By communicating with neighboring luminaires and/or with a centralized server, the invention is able to identify the position and direction of movement of areas of reduced visibility (e.g. fog). This information can then be used to alert drivers who are approaching the identified area.

First claim

1 . A method for providing visibility alerts, said method using at least one Outdoor Lighting Network (OLN) comprising a plurality of lighting units at least two of which are in communication with each other, wherein a plurality of visibility detectors are each in communication with at least one of the lighting units, said method comprising:
monitoring by each visibility detector a geographical area; receiving monitoring data from two or more of the visibility detectors; deriving a consolidated estimate of visibility conditions pertaining to a combined geographical area defined by the monitored geographical areas associated with two or more visibility detectors; determining direction and speed of an area of reduced visibility area using the consolidated estimate of visibility conditions; and, transmitting information pertaining to said estimated visibility conditions and/or area of reduced visibility.

2 . The method of claim 1 wherein said deriving step comprises mapping from data received from each visibility detector to a set of tuples; wherein said tuples comprises membership classes that are associated with levels of obscured visibility.

3 . The method of claim 2 wherein said tuples comprises a percentage membership associated with each class.

4 . The method of claim 2 wherein said deriving step is performed by a centralized server; and wherein tuples from a plurality of light units are utilized in deriving the consolidated estimate.

5 . The method of claim 3 wherein said deriving step is performed by a first light unit, the first light unit being in communication with a least one neighboring light unit which monitors at least part of the same geographical area as that being monitored by the first light unit;
wherein said deriving step further comprises merging an estimate derived by the first light unit pertaining to the geographical area being monitored by the first light unit, with one or more estimates derived by said at least one neighboring light unit.

6 . The method of claim 3 wherein said deriving step is performed by a first light unit, the first light unit not being in communication with a neighboring light unit which monitors at least part of the same geographical area as that being monitored by the first light unit; and
further comprising the step of estimating the visibility conditions, pertaining to the geographical area being monitored by the first light unit, based on highest membership within the membership classes.

7 . The method of claim 1 further comprising storing the following information on one or more databases accessible by a centralized server:
a geographical location of each of the lighting devices and its associated visibility detector;
a mapping of street locations associated with the lighting devices; and
a direction and legal speed limit of traffic flow pertaining to the mapped street locations.

8 . The method of claim 7 further comprising providing an early alert to drivers and to autonomous vehicles and devices approaching the area determined to have reduced visibility.

9 . The method of claim 8 wherein said providing step comprises:
determining one or more street locations where vehicles in said locations are approaching the determined area of reduced visibility.

10 . A system for providing visibility alerts, said system comprising:
at least one Outdoor Lighting Network (OLN) comprising a plurality of lighting units, at least two of which being in communication with each other; a plurality of visibility detectors, each in communication with at least one of the lighting devices, and each capable of monitoring a geographical area; a data analysis engine for receiving monitoring data from two or more of the visibility detectors and for deriving a consolidated estimate of visibility conditions pertaining to a combined geographical area defined by the monitored geographical areas associated with two or more visibility detectors, and determining direction and speed of area of reduced visibility area using the consolidated estimate of visibility conditions; and, a communication module for transmitting information pertaining to said estimated visibility conditions and/or area of reduced visibility.

11 . The system of claim 10 wherein said data analysis engine comprises a means for mapping from data received from each visibility detector to a set of tuples; wherein said tuples comprises membership classes that are associated with levels of obscured visibility.

12 . The system of claim 11 wherein said tuples comprises a percentage membership associated with each class.

13 . The system of claim 12 wherein said data analysis engine resides in a centralized server; and wherein tuples from a plurality of light units are utilized in deriving the consolidated estimate.

14 . The system of claim 12 wherein said data analysis engine resides in a first light unit, the first light unit being in communication with a least one neighboring light unit which monitors at least part of the same geographical area as that being monitored by the first light unit;
wherein an estimate derived by the first light unit pertaining to the geographical area being monitored by the first light unit is merged with one or more estimates obtained by said at least one neighboring light unit.

15 . The system of claim 12 wherein said data analysis engine resides in a first light unit, the first light unit not being in communication with a neighboring light unit which monitors at least part of the same geographical area as that being monitored by the first light unit;
wherein an estimate of visibility conditions pertaining to the geographical area being monitored by the first light unit is derived by the first light unit based on highest membership within the membership classes.

16 . The system of claim 10 further comprising:
a centralized server; and,
one or more databases, said databases comprising the following information:
a geographical location of each of the lighting devices and its associated visibility detector;
a mapping of street locations associated with the lighting devices; and
a direction and legal speed limit of traffic flow pertaining to the mapped street locations.

17 . The system of claim 16 further comprising a means for providing an early alert to drivers approaching the area determined to have reduced visibility.

18 . The system of claim 17 wherein the means for providing comprises:
means for determining one or more street locations where vehicles in said locations are approaching the determined area of reduced visibility.

19 . The system of claim 17 wherein the means for providing an early alert are selected from the group consisting of:
communication means for communicating with a hand-held communication device of the driver;
communication means for communicating by one or more light units directly with the driver's vehicle;
communication means for communicating from the centralized server to the driver's vehicle; and
communication means for communicating between vehicles themselves.

20 . A computer program product comprising a plurality of program code portions, stored in a non-transitory computer readable medium, for carrying out the method according to claim 1 .

21 . A system for providing alerts pertaining to one or more environmental conditions, said system comprising:
at least one Outdoor Lighting Network (OLN) comprising a plurality of lighting units, at least two of which being in communication

Assignees

• Koninkl Philips Nv

Inventors

• De Oliveira Talmai Brandão
• Wang Jianfeng
• Cavalcanti Dave Alberto Tavares

Classifications

• G08G1/0116 Primary

  from roadside infrastructure, e.g. beacons · CPC title

• G08G1/09 Primary

  Arrangements for giving variable traffic instructions ({railroad crossing signals B61L; reflectors E01F, G08B}; indicating arrangements for variable information by selection or combination of individual elements G09F9/00) · CPC title

• G01N21/538

  for determining atmospheric attenuation and visibility · CPC title

• G08G1/096783

  where the origin of the information is a roadside individual element · CPC title

• G08G1/0141

  for traffic information dissemination · CPC title