METHOD FOR ESTIMATING A DISTANCE FROM A FIRST COMMUNICATION DEVICE TO A SECOND COMMUNICATION DEVICE, AND CORRESPONDING COMMUNICATION DEVICES, SERVER AND SYSTEM

• US 20150379352A1
• Filed: 06/24/2015
• Published: 12/31/2015
• Est. Priority Date: 06/27/2014
• Status: Active Grant

• Current Assignee: Magnolia Licensing LLC (IP Edge LLC)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: FONTAINE, Patrick, GOUACHE, Stephane, DEMOULIN, Vincent
• Granted Patent: US 9,715,628 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01C 3/06 Use of electric means to obtain final indication
• CPC Class Codes: G01C 3/22 using a parallactic triangle with variable angles and a base of fixed length at, near, or formed by the object
• CPC Class Codes: G01S 11/12 using electromagnetic waves other than radio waves
• CPC Class Codes: G06V 20/20 in augmented reality scenes
• CPC Class Codes: H04W 4/025 using location based information parameters

Abstract

The invention concerns a method for estimating a distance from a first communication device to a second communication device. According to an aspect of the invention, the method comprises:

• • Taking a picture of the second communication device by the first communication device;
  • Obtaining a description of the second communication device;
  • Identifying the second communication device in the picture, by using said description;
  • Estimating a distance from the first communication device to the second communication device by using the description of the second communication device and dimensions of the second communication device identified in the picture.

Claims

1. A method for estimating a distance from a first communication device to a second communication device,

wherein the method comprises:

Taking a picture of the second communication device by the first communication device;

Receiving from the second communication device a description comprising at least one piece of information about the second communication device;

Identifying at least part of the second communication device in said picture, by using said description;

Estimating a distance from the first communication device to the second communication device by using;

said at least one piece of information about the second communication device,

dimensions of said at least part of the second communication device identified in said picture.

2. The method of claim 1, wherein said description comprises at least one reference picture of at least part of the second communication device and at least one piece of information on dimensions of at least part of the second communication device, and wherein estimating a distance from the first communication device to the second communication device uses said at least one piece of information on dimensions of at least part of the second communication device.

3. The method of claim 1, wherein said description of the second communication device is received by the first communication device through a wireless link established between said first and said second communication devices.

4. The method according to claim 1, wherein said step of identifying at least part of the second communication device implements an object recognition algorithm on the basis of said at least one reference picture.

5. The method according to claim 2, wherein it also comprises:

matching a portion of said at least part of the second communication device identified in said picture with a portion of said reference picture comprised in said description; and

computing a number of pixels associated to the matched portion in said picture.

6. The method of claim 5, wherein estimating the distance d from the first communication device to the second communication device uses the pinhole projection formula:

7. The method of claim 1, wherein it also comprises:

receiving from said second communication device an estimated distance from the second communication device to the first communication device;

comparing said estimated distance received from said second communication device with the distance estimated by said first communication device.

8. The method of claim 1, wherein the steps of taking a picture, receiving a description, identifying and estimating a distance are carried out for several second communication devices,

and wherein said method comprises a step of computing a distance between at least two of said second communication devices.

9. The method of claim 1, wherein the steps of taking a picture, receiving a description, identifying and estimating a distance are carried out for several second communication devices,

and wherein said method comprises a step of estimating a position of said first communication device on the basis of the distances estimated between said first communication device and each of said second communication devices.

10. The method of claim 1, wherein the steps of identifying at least part of a second communication device and of estimating a distance are carried out by said first communication device or by a remote server.

14. Computer program product downloadable from a communications network and/or stored in a computer-readable carrier and/or executable by a microprocessor, characterized in that it comprises program code instructions for the execution of the method for estimating a distance according to claim 1, when it is executed on a computer.

11. A communication device comprising a camera and a communication module, wherein said communication device comprises:

a memory for at least temporarily memorizing a picture of a second communication device taken by the camera;

a recognition module for identifying at least part of the second communication device in said picture, by using a description of the second communication device,

said description comprising at least one piece of information about the second communication device;

an estimation module for estimating a distance from the first communication device to the second communication device by using;

said at least one piece of information about the second communication device, and

dimensions of said at least part of the second communication device identified in said picture,

and wherein said communication module comprises a receiver for receiving said description from the second communication device.

12. A server for estimating a distance from a first communication device to a second communication device,

wherein the server comprises:

a receiver for receiving from a first communication device a picture taken by the first communication device, a distance measurement request and at least one description of at least one second communication device, said description comprising at least one piece of information about the second communication device;

a recognition module for identifying in said picture at least part of at least one second communication device by using said description of the second communication device,

an estimation module for estimating a distance from the first communication device to every second communication device at least partly identified in said picture, said estimation module using;

said at least one piece of information about the second communication device, and

dimensions of said at least part of the second communication device identified in said picture;

a transmitter for transmitting to the first communication device a list of every second communication device at least partly identified in said picture associated with a corresponding estimated distance.

13. A system for estimating a distance from a first communication device to a second communication device,

wherein the system comprises:

said first communication device comprising;

a camera for taking a picture of the second communication device;

a communication module comprising a receiver for receiving a description of the second communication device, said description comprising at least one piece of information about the second communication device;

a recognition module for identifying at least part of the second communication device in said picture, by using said description;

an estimation module for estimating a distance from the first communication device to the second communication device by using;

said at least one piece of information about the second communication device, and

dimensions of said at least part of the second communication device identified in said picture, and

a second communication device comprising a communication module comprising a receiver for receiving a description request from said first communication device, and a transmitter for transmitting to said first communication device said description or an identifier of said second communication device.