Multi-distance information processing using retroreflected light properties

Patent metadata

Field	Value
Publication number	US-11676401-B2
Application number	US-201917261764-A
Country	US
Kind code	B2
Filing date	Sep 30, 2019
Priority date	Oct 4, 2018
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

In some examples, a method may include receiving retroreflected light that indicates at least one retroreflective property of a retroreflective article, wherein retroreflected light is captured at a first distance. The method may include determining a first set of information based at least in part on the at least one retroreflective property of the retroreflective article. The method may include receiving, from the light capture device, an image that includes at least one object, wherein the image is captured at a second distance. The method may include determining, based at least in part on the spatially resolvable property, a second set of information that corresponds to the object in the image. The method may include performing, by a computing device, at least one operation based at least in part on the second set of information.

First claim

The invention claimed is:

1. A method comprising:
receiving, from a light capture device, retroreflected light that indicates at least one retroreflective property of a retroreflective article, wherein retroreflected light is captured at a first distance between the light capture device and the retroreflective article, wherein the retroreflective property comprises a phase retardation of the retroreflected light;
determining, by a computing device communicatively coupled to the light capture device, a first set of information based at least in part on the at least one retroreflective property of the retroreflective article, wherein the first set of information is determined from a pattern encoded in the phase retardation of the retroreflected light;
receiving, by the computing device and from the light capture device, an image that includes at least one object, wherein the image is captured at a second distance between the light capture device and the retroreflective article that is less than the first distance, wherein the at least one object in the image includes a spatially resolvable property that is not resolvable at the first distance;
determining, by the computing device and based at least in part on the spatially resolvable property, a second set of information that corresponds to the object in the image; and
performing, by the computing device, at least one operation based at least in part on the second set of information.

2. The method of claim 1 , wherein the object is the retroreflective article.

3. The method of claim 1 , wherein the at least one operation is a first operation, wherein determining the first set of information based at least in part on the at least one retroreflective property of the retroreflective article comprises:
determining a value that corresponds to the at least one retroreflective property; and
performing a second operation based at least in part on the value while a particular distance between the light capture device and the retroreflective article is greater than the second distance and less than the first distance.

4. The method of claim 1 , wherein the spatially resolvable property of the object is a visual feature of the article.

5. The method of claim 1 , wherein the visual feature of the object is at least one of a shape and a color of the article.

6. The method of claim 1 , wherein the spatially resolvable property of the object is an optical pattern embodied on the object.

7. The method of claim 1 , wherein the computing device is included in a vehicle to control the operation of the vehicle.

8. The method of claim 1 , wherein performing at least one operation based at least in part on the second set of information comprises changing an operation of a vehicle.

9. The method of claim 1 , wherein the retroreflective property further comprises at least one of a wavelength and a light intensity of the retroreflected light.

10. The method of claim 1 , wherein the first set of information is interpretable based on a combination of a first spectral response and a second spectral response.

11. The method of claim 1 , wherein the retroreflective article comprises:
a retroreflective substrate; and
an optical pattern embodied on the retroreflective substrate, the optical pattern comprising a first optical sub-pattern and a second optical sub-pattern, wherein the optical pattern represents a set of information that is interpretable based on a combination of the first optical sub-pattern that is visible in a first light spectrum and the second optical sub-pattern that is visible in a second light spectrum, wherein the first and second light spectra are different.

12. The method of claim 1 , wherein the first spectral response is within a first light spectrum and the second spectral response is within a second light spectrum.

13. The method of claim 1 , wherein the retroreflective property is based at least in part on a filter embodied on the retroreflective article.

14. The method of claim 1 , wherein the retroreflective property is based at least in part on a filter embodied on the light capture device.

15. A computing device comprising one or more computer processors; and
a memory comprising instructions that, when executed by the one or more computer processors, cause the one or more computer processors to perform the method of claim 1 .

16. A non-transitory, computer-readable medium comprising instructions that, when executed in a computer processor, causes the computer processor to perform the method of claim 1 .

17. An apparatus comprising means for performing the method of claim 1 .

Assignees

• 3M Innovative Properties Company

Inventors

• Wheatley John A
• Clear Susannah C

Classifications

• G06V20/582 Primary

  of traffic signs · CPC title

• G06V10/145

  Illumination specially adapted for pattern recognition, e.g. using gratings · CPC title

• G06V10/143

  Sensing or illuminating at different wavelengths · CPC title

• G05D1/0234

  using optical markers or beacons (optical beacons per se G01S1/70) · CPC title

• G05D2201/0213

  Physics · mapped topic