DEVICE AND METHOD FOR THE SPACE-COLORIMETRIC MEASUREMENT OF A THREE-DIMENSIONAL OBJECT

• US 20120004884A1
• Filed: 01/23/2008
• Published: 01/05/2012
• Est. Priority Date: 01/23/2008
• Status: Abandoned Application

• Current Assignee: Bernard Fillol, Frédéric Weimann, Jean-Marie Magain, Jean Tretout, Philippe Gremillet
• Original Assignee: Bernard Fillol, Frédéric Weimann, Jean-Marie Magain, Jean Tretout, Philippe Gremillet
• Inventors: Fillol, Bernard, Gremillet, Philippe, Magain, Jean-Marie, Tretout, Jean, Weimann, Frédéric
• Application Number:
  US12/864,132
• Publication Number:
  US 20120004884A1
• Time in Patent Office: Days
• US Class Current: 702/150
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0278 Control or determination of height or angle information for sensors or receivers
• CPC Class Codes: G01J 3/51 using colour filters
• CPC Class Codes: G01J 3/513 having fixed filter-detector pairs

Abstract

The disclosure relates to a device and a method for the space-colorimetric measurement of a three-dimensional object, in order to digitally model the low-relief and the colorimetric coordinates of this object according to multiple analysis points. In order to do so, the measuring device of the disclosure combines a lighting means with at least four optical detection means, including at least two twin detection means sensitive to substantially identical light wavelength ranges, in order to determine by stereoscopic effect the low-relief of the object analysed. The disclosure thus proposes a device for the space-colorimetric measurement of a three-dimensional object, that comprises a detection head including a lighting means for the object and at least four detection means for detecting the light reflected by the object, wherein said device further includes a unit for processing the information received by the detection means. At least two twin detection means are sensitive to substantially identical light wavelength ranges.

Claims

1. A device for the space-colorimetric measurement of a three-dimensional object comprising a detection head made up of object lighting and at least four detectors for detecting light reflected by the object, a unit processing the data received by the detectors, and at least two twin detectors being sensitive to substantially identical light wavelength ranges.

2. The device according to claim 1, wherein both twin detectors comprise twin filtration members associated to at least one matrix photonic sensor.

3. The device according to claim 2, wherein the matrix photonic sensor is divided into several zones respectively receiving the rays of light coming from each of the twin filtration members.

4. The device according to claim 3, wherein the matrix photonic sensors are CMOS sensors.

5. The device according to claim 1, wherein both twin detectors are sensitive to one wavelength range substantially equal to the range of green wavelengths.

6. The device according to claim 1, wherein the two primary detectors are sensitive, one to a range of the field of the blue wavelengths, and the other to a range of the field of the red wavelengths.

7. The device according to claim 1, wherein the lighting comprises a central light source around which the detectors are arranged.

8. The device according to claim 1, wherein the lighting comprises an annular lighting source arranged around the detectors.

9. The device according to claim 1, wherein the detection head is topped by an end cover of predetermined depth.

10. A method for the space-colorimetric measurement of a three-dimensional object comprising:

i. emitting at least a ray of light to lighten the object to be analyzed;

ii. receiving the rays of light reflected by the object on at least four primary detectors; and

iii. transferring the light information gathered by the detectors towards a processing unit;

wherein the light beams reflected by the object are detected by at least two twin detectors sensitive to substantially identical light wavelength ranges.

11. The method according to claim 10, comprising calibrating the primary detectors beforehand.

12. The method according to claim 10, wherein the processing unit determines, by iterative calculation, the relative position of a plurality of analysis points with respect to the detection head.

13. The method according to claim 12, wherein the processing unit determines, by stereoscopy, the distance of a plurality of analysis points with respect to the primary detectors.

14. The method according to claim 12, wherein the processing unit determines the coordinates of the normal to the surface of the object, in a plurality of analysis points.

15. The method according to claim 12, wherein the iterative calculation of the depth is achieved between a minimum depth, corresponding to the distance between the primary detectors and the end of an end cover, and a predetermined maximum depth.

16. The method according to claim 12, wherein the iterative pitch is substantially equal to the size of the range corresponding to a pixel for the predetermined minimum depth.

17. The method according to claim 10, wherein the processing unit discards analysis points the intensity of colorimetric values of which exceeds a value predetermined by calibration.

18. The method according to claim 17, comprising a step of calculating colorimetric coordinates of a plurality of weighted analysis points according to the position of the analysis points.

19. The method according to claim 17, wherein the colorimetric coordinates of each point are adjusted by bilinear interpolation.