Three dimensional imaging apparatus with color sensor

Patent metadata

Field	Value
Publication number	US-10708574-B2
Application number	US-201815953268-A
Country	US
Kind code	B2
Filing date	Apr 13, 2018
Priority date	Jun 15, 2017
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

An imaging apparatus includes a first and second light source, focusing optics, a probe, a detector, an optical transmission medium and a color sensor. The first light source is to generate light beams that travel through the focusing optics along an optical path to the probe. The probe directs the light beams toward a three dimensional object to be imaged. The detector detects returning light beams that are reflected off of the three dimensional object and directed back through the probe and the focusing optics. The second light source is to generate multi-chromatic light. The optical transmission medium is outside of the optical path and is to receive a ray of the multi-chromatic light reflected off of a spot on the three dimensional object and through the probe. The color sensor is to receive the ray from the optical transmission medium and determine a color of the spot on the three dimensional object.

First claim

What is claimed is:

1. An imaging apparatus comprising:
a first light source to generate first light that is to illuminate a three dimensional object;
a probe to receive a plurality of rays of the first light that are reflected off of the three dimensional object and to direct the plurality of rays along an optical path associated with an imaging axis;
a detector to detect the plurality of rays, wherein measurements of the plurality of rays indicate a shape of the three dimensional object;
a second light source to generate multi-chromatic light that is to illuminate the three dimensional object;
an optical transmission medium, outside of the optical path, to receive one or more rays of the multi-chromatic light reflected off of a spot on the three dimensional object and through the probe; and
a color sensor, optically coupled to a first end of the optical transmission medium, to receive the one or more rays of the multi-chromatic light and determine a color of the spot on the three dimensional object based on an analysis of the one or more rays.

2. The imaging apparatus of claim 1 , wherein the one or more rays of the multi-chromatic light have an oblique angle to an imaging axis associated with the optical path, and wherein the optical transmission medium is oriented at the oblique angle to the imaging axis.

3. The imaging apparatus of claim 1 , wherein the one or more rays of the multi-chromatic light are parallel to the optical path, the imaging apparatus further comprising:
a beam splitter disposed along the optical path, wherein the beam splitter directs the one or more rays of the multi-chromatic light into the optical transmission medium.

4. The imaging apparatus of claim 3 , wherein the beam splitter passes a first portion of the one or more rays of the multi-chromatic light to the detector and directs a second portion of the one or more rays of the multi-chromatic light to the optical transmission medium, where the second portion is less than the first portion.

5. The imaging apparatus of claim 1 , wherein the imaging apparatus is to:
at a first time, activate the first light source, determine a first shape of a first portion of the three dimensional object, and determine a first relative position of the probe to the three dimensional object;
at a second time, deactivate the first light source, activate the second light source, and determine the color of the spot on the three dimensional object;
at a third time, deactivate the second light source, activate the first light source, determine a second shape of a second portion of the three dimensional object, and determine a second relative position of the probe to the three dimensional object; and
determine a position of the spot on the three dimensional object based on an interpolation between the first relative position of the probe to the three dimensional object and the second relative position of the probe to the three dimensional object.

6. The imaging apparatus of claim 1 , wherein the imaging apparatus is a confocal imaging apparatus, wherein the first light comprises an array of light beams, and wherein the plurality of rays of the first light comprise an array of returning light beams that have reflected off the three dimensional object, the confocal imaging apparatus further comprising:
focusing optics along an optical path of the array of light beams to direct the array of light beams through the probe, wherein the array of returning light beams are directed back through the probe and the focusing optics and into the detector; and
a translation mechanism to adjust a focusing setting of the focusing optics;
wherein the detector is to measure intensities of the array of returning light beams at a plurality of focusing settings of the focusing optics, wherein the intensities of the array of returning light beams at the respective plurality of focusing settings of the focusing optics indicate the shape of the three dimensional object.

7. The imaging apparatus of claim 1 , wherein the detector is further to receive a plurality of additional rays of the multi-chromatic light and to generate a color two dimensional image of the three dimensional object, wherein colors of the color two dimensional image are lower accuracy than the color of the spot determined by the color sensor, wherein the color sensor is a hyper spectral sensor or a colorimeter.

8. The imaging apparatus of claim 1 , further comprising:
a lens at a second end of the optical transmission medium, the lens to collect the one or more rays of the multi-chromatic light and direct the one or more rays into the optical transmission medium.

9. The imaging apparatus of claim 1 , wherein the first light comprises coherent light.

10. The imaging apparatus of claim 1 , wherein the three dimensional object is a tooth, the imaging apparatus further comprising:
a third light source to emit third light having a wavelength of approximately 405 nm, wherein the third light causes the tooth to fluoresce and emit a plurality of additional light rays;
wherein the color sensor is to receive one or more additional light rays of the plurality of additional light rays and determine a magnitude of fluorescence of the tooth based on the one or more additional light rays.

11. The imaging apparatus of claim 1 , further comprising a processing device to:
determine a distance of the probe from the three dimensional object;
determine an angle of incidence of the one or more rays of the multi-chromatic light with the spot on the three dimensional object; and
adjust an intensity for the one or more rays of the multi-chromatic light based on the distance and the angle of incidence.

12. A system comprising:
an intraoral scanner, comprising:
a first light source to generate first light that is to illuminate a three dimensional object;
a probe to receive a plurality of rays of the first light that are reflected off of the three dimensional object and to direct the plurality of rays along an optical path associated with an imaging axis;
a detector to detect the plurality of rays, wherein measurements of the plurality of rays indicate a shape of the three dimensional object;
a second light source to generate second light that is to illuminate the three dimensional object, wherein the second light is a multi-chromatic light; and
a color sensor, outside of the optical path, to receive one or more rays of the second light reflected off of a spot on the three dimensional object and through the probe, and to determine a color of the spot on the three dimensional object based on an analysis of the one or more rays, wherein the one or more rays of the second light have an oblique angle to the imaging axis, and wherein the color sensor is oriented at the oblique angle to the imaging axis; and

a computing device operatively connected to the intraoral scanner, the computing device to:
receive first image data generated by the detector;
generate a three dimensional model of the three dimensional object based on the first image data;
receive color data generated by the color sensor; and
determine colors for one or more spots on the three dimensional model based on the color data.

13. The system of claim 12 , wherein the computing device is further to:
determine one or more regions of the three dimensional model for which color data is lacking; and
indicate the one or more regions on the three dimensional model.

14. The system of claim 12 , wherein the intraoral scanner is to alternate between use of the first light source and the detector to determine the shape of the three dimensional object and use of the second l

Assignees

• Align Technology Inc

Inventors

• Furst Gilad
• Verker Tal
• Saphier Ofer

Classifications

• H04N23/555

  for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes · CPC title

• H04N23/56

  provided with illuminating means · CPC title

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• H04N23/74

  by influencing the scene brightness using illuminating means · CPC title

• H04N23/10

  for generating image signals from different wavelengths · CPC title