PROCEDURE AND DEVICE FOR THE MEASUREMENT OF DYNAMIC LUMINANCE AND RETROREFLECTION OF ROAD MARKINGS AND SIGNALS AND THE OBTENTION OF THE SHAPE, POSITION AND DIMENSIONS OF THE SAME

• US 20140313504A1
• Filed: 11/14/2012
• Published: 10/23/2014
• Est. Priority Date: 11/14/2012
• Status: Abandoned Application

• Current Assignee: Foundaion Cidaut
• Original Assignee: Foundaion Cidaut
• Inventors: Gutierrez Mendez, Jose Antonio, Mansilla Gallo, Alberto, Real Cortes, Jesus Angel, Ortiz De Lejarazu Machin, Diego
• Application Number:
  US14/007,278
• Publication Number:
  US 20140313504A1
• Time in Patent Office: Days
• US Class Current: 356/72
• CPC Class Codes: G01B 11/02 for measuring length, width or thickness G01B11/08 takes precedence
• CPC Class Codes: G01B 11/14 for measuring distance or clearance between spaced objects or spaced apertures G01B11/26 takes precedence; rangefinders G01C3/00
• CPC Class Codes: G01N 2021/551 Retroreflectance
• CPC Class Codes: G01N 21/55 Specular reflectivity
• CPC Class Codes: G08G 1/09623 Systems involving the acquisition of information from passive traffic signs by means mounted on the vehicle G08G1/0967 takes precedence

Abstract

A dynamic measurement procedure of the luminance and retroreflection of the road markings and signals and obtention of the dimensions of the same from a vehicle that circulates on the road; illuminating the zone of interest; knowing the position of the vehicle; measuring the luminance by means of a light sensor in a single pass, at known distances or intervals; identifying and extracting one or several road markings and signals simultaneously in each measurement of luminance by means of algorithms; referencing the luminance both geometrically and in time, as well as the obtention of the shape, position and dimensions of the same; and the device for carrying out said procedure, which includes a luminous source, a system of global positioning of the vehicle, a light sensor, a camera, a data processor and a data storage device.

Claims

1. Dynamic procedure of measurement of the luminance and retroreflection of the road markings and signals and obtention of the dimensions of the same from a vehicle that circulates along the road, comprising the following steps:

a. illumination of zone of interest with illuminating source,

b. positioning of vehicle by means of global positioning system,

c. measurement of the luminance by means of light sensor of the zone of interest in a single pass, at distances or intervals known in the same moment as step b),

d. simultaneous identification and extraction of one or more road markings and signals during each measurement of the illumination acquired in step c) and, in relation to the zone of interest, by means of artificial or manual vision algorithms,

e. referencing of the illumination obtained in step c) according the the measurement of step b), both geometrically and in time,

f. measurement over road markings and signals identified in step d), and referred to in step e), of the luminance values and the of retroreflection coefficient.

g. obtention of the shape, position and dimensions of said road markings and signals identified in step d) and referred to in step e).

2. Dynamic measurement and calculation procedure of the luminance and retroreflection of the road markings and signals in accordance with claim 1, wherein in step c) the measurement of luminance is done through images that are acquired by means of multiple light sensors, which comprise a photosensitive plate;

in step d) one or several road markings and signals are identified and extracted from said images and values obtained in step c), in such a way that the values and dimensions of steps f) and g) are obtained.

3. Dynamic measurement and calculation procedure of the luminance and retroreflection of the road markings and signals in accordance with claim 1, wherein zone of interest is a broad area, which comprises an angle of vision equal to or greater than that of a user.

4. Dynamic measurement and calculation procedure of the luminance and retroreflection of the road markings and signals in accordance with claim 1, wherein in step c) values are acquired from sensors such as GPS, odometer, temperature and humidity.

5. Dynamic measurement and calculation procedure of the luminance and retroreflection of the road markings and signals in accordance with claim 1, wherein the coefficient of retroreflection of said road markings and signals are obtained for a specific geometry on the basis of the amount of light provided by luminous source (2), and the luminance measured on road markings and signals,

6. Dynamic measurement and calculation procedure of the luminance and retroreflection of the road markings and signals in accordance with claim 1, wherein luminous source is illuminated in a continuous manner.

7. Dynamic measurement and calculation procedure of the luminance and retroreflection of the road markings and signal in accordance with claim 1, wherein luminous source is illuminated in a pulsing mode in order to avoid contamination from other luminous sources.

8. Dynamic measurement and calculation procedure of the luminance and retroreflection of the road markings and signals in accordance with claim 1, wherein the luminous emission in space is known from luminous source.

9. Dynamic measurement and calculation procedure of the luminance and retroreflection of the road markings and signals in accordance with claim 1, wherein the device employed for measuring luminance is a luminance meter.

10. Dynamic measurement and calculation procedure of the luminance and retroreflection of the road markings and signals in accordance with claim 1, wherein the device employed for measuring retroreflection is a retroreflector meter.

11. Dynamic measurement and calculation procedure of the luminance and retroreflection of the road markings and signals in accordance with claim 1, wherein the procedure is automatic.

12. Dynamic measurement and calculation procedure of the luminance and retroreflection of the road markings and signals in accordance with claim 1, wherein the relative position and orientation of the vehicle to the road is measured by means of a positioning and orientation system relative to road, in order to obtain greater accuracy in the measurements.

13. A Device for the measurement of the luminance and retroreflection of the road markings and signals, and the obtention of the dimensions of the same in accordance with a procedure—

having the following steps;

a. illumination of zone of interest with illuminating source,

b. positioning of vehicle by means of global positioning system,

c. measurement of the luminance by means of light sensor of the zone of interest in a single pass, at distances or intervals known in the same moment as step b),

d. simultaneous identification and extraction of one or more road markings and signals during each measurement of the illumination acquired in step c) and, in relation to the zone of interest, by means if artificial or manual vision algorithms,

e. referencing of the illumination obtained in step c) according the the measurement of step b), both geometrically and in time,

f. measurement over road markings and signals identified in step d), and referred to in step e), of the luminance values and the of retroreflection coefficient,

g. obtention of the shape, position and dimensions of said road markings and signals identified in step d) and referred to in step e), the device being—

installed in a vehicle, comprising, a luminous source, a global positioning system of vehicle, a light sensor, a camera, a data processor and a data storage device.

14. Device in accordance with claim 13, which further comprises a position measurer of the position and orientation of the vehicle with respect of the road.

15. Device in accordance with claim 13, further comprising a GPS unit, an odometer, a temperature and a humidity sensors.