System and method for holographic image display

1. A system comprising:

a display configured to contemporaneously project a plurality of views, wherein each view of the plurality of views is projected in a different spatial direction;

a tracking sensor proximal the display configured to determine at least one of a number of viewers within a threshold distance of the display or a pose of a face or eyes of the viewers; and

a processor configured to lenticularize the plurality of views;

wherein the display is operable in a tracked mode and an untracked mode;

wherein in the tracked mode, at least one of the plurality of views is modified based on the pose of the face or the eyes of the viewers prior to lenticularizing the plurality of views, wherein the display operates in the tracked mode when a number of viewers is at most a threshold number of viewers; and

wherein in the untracked mode, the plurality of views are lenticularized without modifications based on the pose of the face or the eyes of the viewers, wherein the display operates in the untracked mode when the number of viewers is greater than the threshold number.

2. The system of claim 1 , wherein the processor is configured to lenticularized the plurality of views based on a calibration of the display.

3. The system of claim 2 , wherein the calibration comprises a slope, a center, and a pitch between pixels of the display and a lenticule of the display.

4. The system of claim 2 , wherein lenticularizing the plurality of views comprises aligning pixels from the plurality of views to pixels of the display so each view of the plurality of views is presented to a predetermined direction in space.

5. The system of claim 2 , wherein the calibration is determined from a convergent calibration parameter and an orthographic calibration parameter.

6. The system of claim 1 , wherein the display switches from the tracked mode to the untracked mode when the number of viewers within the threshold distance of the display changes to exceed the threshold number.

7. The system of claim 6 , wherein the display switches from the untracked mode to the tracked mode when the number of viewers within a second threshold distance of the display changes to less than the threshold number.

8. The system of claim 7 , wherein the second threshold distance is greater than the threshold distance.

9. The system of claim 1 , wherein when no viewers are within the threshold distance of the display, the display operates in the untracked mode.

10. The system of claim 1 , wherein in the tracked mode a subset of views of the plurality of views are modified, wherein the subset of views are views that are to be transmitted to a spatial position associated with the face or the eyes of the viewer.

11. The system of claim 10 , wherein when an eye of the viewer is located at a spatial position associated with two or more views, the two or more views are changed to be the same view.

12. The system of claim 1 , wherein in the tracked mode the at least one view of the plurality of views is modified to account for a difference in vertical parallax between default vertical parallax of the display and a spatial position of the viewer as determined based on the pose of the face or eye of the viewer.

13. The system of claim 1 , wherein in the tracked mode when two viewers are in spatial positions associated with the same views, a viewcone center of the display is adjusted so that the views associated with the spatial positions of the two viewers are no longer associated with the same views.

14. The system of claim 1 , wherein when the tracking sensor loses the pose of the face or the eyes of the viewers, the processor is configured to determine an estimated pose of the face or the eyes of the viewers using dead reckoning from a pose prior to the tracking sensor losing the pose of the face or the eyes of the viewers.

15. The system of claim 14 , wherein the display transitions from the tracked mode to the untracked mode after a threshold amount of time has elapsed since the processor started using dead reckoning to determine the estimated pose.

16. The system of claim 1 , wherein when the display is transitioning between the tracked mode and the untracked mode, the display smoothly achieves the transition.

17. The system of claim 16 , wherein the transition occurs over a period of at least 10 display refresh cycles.

18. The system of claim 16 , wherein during the transition from the tracked mode to the untracked mode, the display provides higher perceived quality three dimensional images to viewers that were tracked during the tracked mode.

19. The system of claim 1 , wherein the processor is configured to overdrive the plurality of views.

20. The system of claim 1 , wherein the tracking sensor comprises a depth camera or a stereo camera.