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1. WO2020047140 - DYNAMIC ILLUMINATION FOR EYE-TRACKING

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[ EN ]

CLAIMS

We claim:

1. An apparatus comprising:

a stereoscopic image viewer including:

a viewing lens including a plurality of components;

an image capture unit configured to capture image frames; and

a plurality of light sources configured to pass light through the viewing lens; and a controller coupled to the stereoscopic image viewer to receive captured image frames and coupled to the plurality of light sources, the controller being configured to:

control light output from each of the plurality of light sources; and

switch light output from one of the plurality of light sources to another one of the

plurality of light sources if a comeal reflection intersects a fixed reflection from the viewing lens in the captured image frame.

2. The apparatus of Claim 1, wherein the viewing lens comprises: an outer surface; and an anti-reflective coating for light from the plurality of light sources, the anti-reflective coating being on the outer surface of the viewing lens.

3. The apparatus of any one of Claims 1 and 2, wherein the plurality of light sources comprises a plurality of non-visible light sources.

4. The apparatus of Claim 3, wherein the plurality of non-visible light sources comprises a plurality of infrared light sources.

5. The apparatus of any one of Claims 1 and 2:

wherein the image capture unit comprises a lens assembly; and

wherein the plurality of light sources comprises: a first light source displaced in a first

direction from the lens assembly of the image capture unit; and second first light source displaced in a second direction from the lens assembly of the image capture unit, where the first direction is opposite to the second direction.

6. The apparatus of any one of Claims 1 and 2, wherein each one of the plurality of light sources includes more than one light source.

7. An apparatus comprising:

a stereoscopic image viewer including:

a first lens and a second lens;

an image capture unit configured to capture image frames, each image frame including

(i) a right eye image captured from first light reflected from a right eye of a user and

(ii) a left eye image captured from second light reflected from a left eye of the user, the first reflected light passing through the first lens of the stereoscopic image viewer before being captured by the image capture unit, and the second reflected light passing through the second lens before being captured by the image capture unit; a plurality of light sources configured to illuminate the left and right eyes with light after the light passes through the first and second lenses; and

a controller coupled to the stereoscopic image viewer to receive captured image frames and coupled to the plurality of light sources,

the controller being configured to:

control light output from each of the plurality of light sources; and

stop light output from one of the plurality of light sources if the light output from the one of the plurality of light sources results in a glint in a captured frame intersecting a fixed reflection in that captured image frame, the glint being used in tracking of a gaze of the user.

8. The apparatus of Claim 7, the stereoscopic image viewer further comprising:

a first movable viewing assembly comprising the first lens and a first reflective structure, the first reflective structure reflecting first visible light, passing a first portion of the light from the plurality of light sources, and passing reflected light from the first portion of the light from the plurality of light sources, the first reflective structure being positioned to reflect the first visible light into the first lens, to pass the first portion of the light from the plurality of light sources toward the first lens, and to pass reflected light from the first portion of the light from the plurality of light sources toward the image capture unit; and a second movable viewing assembly comprising the second lens and a second reflective structure, the second reflective structure reflecting second visible light, passing a second portion of the light from the plurality of light sources, passing reflected light from the second portion of the light from the plurality of light sources, the second reflective structure being positioned to reflect the second visible light into the second lens, to pass the second portion of the light from the plurality of light sources toward the second lens, and to pass the reflected light from the second portion of the light from the plurality of light sources toward the image capture unit.

9. The apparatus of Claim 8, wherein the first reflective structure comprises a dichroic surface, and wherein the second reflective structure comprises a dichroic surface.

10. The apparatus of Claim 8, wherein the first reflective structure comprises a ninety percent reflective surface, and wherein the second reflective structure comprises a ninety percent reflective surface.

11. The apparatus of Claim 8:

the first lens being fixedly coupled to the first reflective structure in the first movable

viewing assembly, wherein the first lens and the first reflective structure move as a unit as the first movable viewing assembly moves; and

the second lens being fixedly coupled to second reflective structure in the second movable viewing assembly, wherein the second lens and the second reflective structure move as a unit as the second movable viewing assembly moves.

12. The apparatus of Claim 11:

the first movable viewing assembly further comprising a first display unit mounted in the first movable viewing assembly to provide the first visible light to the first reflective structure, the first display unit being fixedly coupled to the first reflective structure in the first movable viewing assembly, wherein the first lens, the first reflective structure, and the first display unit move as a unit as the first movable viewing assembly moves; and the second movable viewing assembly further comprising a second display unit mounted in the second movable viewing assembly to provide the second visible light to the second reflective structure, the second display unit being fixedly coupled to the second reflective structure in the second movable viewing assembly, wherein the second lens, the second reflective structure, and the second display unit move as a unit as the second movable viewing assembly moves.

13. The apparatus of Claim 7, wherein each of the first lens and the second lens comprises a plurality of lens combined to together to form a single lens structure.

14. The apparatus of Claim 13, wherein the single lens structure comprises an outer surface, and an anti-reflective coating for light from the plurality of light sources on the outer surface.

15. The apparatus of Claim 7, the controller further being configured to cause a different one of the of the plurality of light sources to output light if the light output from the one of the plurality of light sources is stopped.

16. The apparatus of Claim 7, wherein the plurality of light sources comprises a first set of light sources and a second set of light sources, the first set of light source being configured to illuminate the left eye with light after the light passes through the first lens, and the second set of light source being configured to illuminate the right eye with light after the light passes through the second lens.

17. The apparatus of Claim 16, the controller being configured to control light output from each of the plurality of light sources comprises:

the controller being configured to command a first one of the first set of light sources to output light.

18. The apparatus of Claim 17, the controller being configured to stop light output from one of the plurality of light sources comprises:

the controller being configured to stop the light output from the first one of the first set of light sources.

19. The apparatus of Claim 18, the controller further being configured to command one different from the first one of the first set of light sources to output light if the light output from the first one of the first set of light sources is stopped.

20. The apparatus of any one of Claims 7 to 19, wherein the plurality of light sources comprises a plurality of non- visible light sources.

21. The apparatus of Claim 20, wherein the plurality of non- visible light sources comprises a plurality of infrared light sources.

22. A medical system comprising:

a controller coupled to a stereoscopic image viewer to receive captured image frames from an image capture unit of the stereoscopic image viewer and coupled to a plurality of light sources of the stereoscopic image viewer, each of the plurality of light sources being configured to pass light through a lens of the stereoscopic image viewer to illuminate at least a portion of a human eye, the image capture unit being positioned to receive reflected light passed through the lens to the image capture unit;

the controller being configured to:

control light output from each of the plurality of light sources; and

stop light output from one of the plurality of light sources if the light output from the one of the plurality of light sources results in an intersection of a glint in a captured image frame with a fixed reflection in that captured image frame, the glint being used to track a gaze of a user.

23. The medical system of Claim 22, the controller further being configured to cause a different one of the of the plurality of light sources to output light if the light output from the one of the plurality of light sources is stopped.

24. The medical system of Claim 22, the controller being configured to control light output from each of the plurality of light sources comprises:

the controller being configured to command the one of the plurality of light sources to output light.

25. A method comprising:

stopping, by a controller, light output from one of a plurality of light sources within a

stereoscopic image viewer if the light output from the one of the plurality of light sources results in an intersection of a glint in a captured image frame with a fixed reflection in that captured image frame, the glint being used to track a gaze of a user, and the captured image frame being captured by an image capture unit within the stereoscopic image viewer.

26. The method of Claim 25, further comprising:

commanding, by the controller, a different one of the plurality of light sources to output light if the light output from the one of the plurality of light sources is stopped.

27. The method of Claim 25, further comprising:

commanding, by the controller, the one of the plurality of light sources to output light prior to the stopping.

28. A method comprising:

generating, by a controller, a first bitmap representing reflections in a first image frame

captured by an image capture unit within a stereoscopic image viewer;

generating, by the controller, a second bitmap representing reflections in a second image frame captured by the image capture unit within the stereoscopic image viewer;

subtracting, by the controller, the second bitmap from the first bitmap to obtain a new

bitmap; and

stopping, by the controller, light output from one of a plurality of light sources within the stereoscopic image viewer if all bits in the new bitmap have a same state.

29. The method of Claim 28, further comprising:

commanding, by the controller, a different one of the plurality of light sources to output light if the light output from the one of the plurality of light sources is stopped.

30. The method of Claim 28, further comprising:

commanding, by the controller, the one of the plurality of light sources to output light prior to the stopping.