Computation time reduction for the three-dimensional displays
View Patent ↗A reconfigurable, three-dimensional display ( 1 ) wherein knowledge of the viewer's ( 4 ) eyes is used to enable the effective exit pupil(s) of the display system to be optimised. The system utilises this knowledge to identify contributing regions ( 5 ) within the display ( 1 ) that contribute light to the viewer ( 4 ). Priority is given to calculating and displaying the part of the display corresponding to the contributing region ( 5 ), thereby allowing the system computation requirements to be minimised. Further computation savings are achievable by recognising that only light travelling in a limited range of angles need to be considered.
1. Apparatus for producing a three-dimensional image, said apparatus comprising;
a display means for producing a three dimensional image, said image capable of being viewed from a range of viewing positions, wherein said display means having an exit pupil of a size determined by values assigned to pixels in a plurality of sub-regions of the display;
a monitoring means for determining a viewing position of at least one observer, and
control means, responsive to the monitoring means, for controlling the display means, wherein the control means provides computational priority to the determined viewing position by computing pixel values in the sub-regions such that a complete image is first provided for said determined viewing position and, as a consequence, reducing the size of the exit pupil.
2. The apparatus according to claim 1 wherein the viewing positions of two or more observers are determined and wherein priority is given to producing a complete image for each of the determined viewing positions.
3. The apparatus according to claim 1 or 2 wherein the control means identifies at least one contributing region, comprising addressable sub-regions of the display means, that contributes to the image formed for the at least one viewing position and wherein priority is given to calculating pixel values of the display means for said at least one contributing region.
4. The apparatus according to claim 3 wherein the control means gives priority to calculating pixel values for each of the sub-regions of the display means that comprise substantially the centre of the at least one said contributing region.
5. The apparatus according to claim 3 and further comprising means for determining the position of ocular fixation within the display means of the at least one observer and wherein the control means gives priority to calculating pixel values for each of the sub-regions of the display means that contribute substantially to the image at the position of ocular fixation of the at least one observer.
6. The apparatus according to any of the preceding claims wherein the control means gives priority to calculating pixel values for each of the sub-regions of the display means that correspond substantially to parts of the image that are changing.
7. The apparatus according to claim 1 , wherein the control means determines the range of angles that sub-regions of the display means must direct light into to contribute to the image formed for the at least one viewing position and wherein priority is given to calculating pixel values of the display means such that light is substantially directed into said range of angles.
8. The apparatus according to claim 1 , wherein the control means controls the display means such that the effective exit pupil of the apparatus is optimised for the at least one viewer.
9. The apparatus according to claim 1 , wherein the effective exit pupil over which the complete image is viewable is enlarged during periods when the image is substantially unchanging.
10. The apparatus according to claim 1 , wherein the display means comprises a spatial light modulator (SLM) means.
11. The apparatus according to claim 10 wherein the control means calculates the modulation required in the sub-regions of the spatial light modulator means.
12. The apparatus according to claim 1 , wherein the monitoring means collects information relating to the eyes of the at least one observer and wherein said information is used by the control means to adapt the effective exit pupil of the apparatus to match the eyes of the at least one observer.
13. The apparatus according to claim 1 , wherein the addressable sub-regions of the display means display a computer generated hologram.
14. A method of reducing the time required to display a reconfigurable three-dimensional image using a display means comprising a plurality of addressable sub-regions, capable of producing a three dimensional image which is capable of being viewed from a range of viewing positions, a monitoring means for determining the viewing position of at least one observer, and control means responsive to the monitoring means for controlling the display means ( 1 ), wherein said method is comprised by the steps of:
determining the viewing position of the at least one observer; and
prioritising the control of the addressable sub-regions within the display means to first produce a complete image for the determined viewing position, thereby reducing the initial computation of pixel values.
15. The method according to claim 14 wherein the viewing positions of two or more observers are determined and the control of the addressable sub-regions within the display means is prioritised to produce a complete image for the two or more determined viewing positions.
16. The method according to claims 14 or 15 and further comprising the steps of identifying at least one contributing region, comprising addressable sub-regions of the display means, that contributes to the image formed for the at least one viewing position and giving priority to calculating pixel values for the sub-regions within the display means that comprise substantially the at least one said contributing region.
17. The method according to claim 16 wherein priority is given to calculating pixel values for each of the sub-regions of the display means that comprise substantially the centre of the at least one said contributing region.
18. The method according to claim 16 further comprising the steps of determining the position of ocular fixation within the display means of the at least one observer and giving priority to calculating pixel values for each of the sub-regions of the display means that contribute substantially to the image at the position of ocular fixation of the at least one observer.
19. The method according to claim 14 , wherein priority is given to calculating pixel values for each of the sub-regions of the display means that correspond substantially to parts of the image that are changing.
20. The method according to claim 14 , further comprising the steps of determining the range of angles that sub-regions of the display means must direct light into to contribute substantially to the image formed for the at least one viewing position and calculating the pixel values of the display means such that priority is given to directing light into substantially said range of angles.
21. The method according to claim 14 , further comprising the step of controlling the display means such that the effective exit pupil of the apparatus is optimised for the at least one viewer.
22. The method according to claim 14 , further comprising the step of enlarging the effective exit pupil over which the complete image is viewable during periods when the image is substantially unchanging.
23. The method according to claim 14 , wherein the display means comprises a spatial light modulator (SLM) means.
24. The method according to claim 23 wherein the control means calculates the modulation required in the sub-regions of the spatial light modulator means.
25. The method according to claim 14 , wherein the monitoring means collects information relating to the eyes of the at least one observer and wherein said information is used by the control means to adapt the effective exit pupil of the apparatus to match the eyes of the at least one observer.
26. The method according to claim 14 , wherein the addressable sub-regions of the display means display a computer generated hologram.