Method for reconstructing a holographic projection

1. A method for reconstructing a holographic projection comprising:

providing a single hologram;

providing at least one cyclic shift of at least a portion of the single hologram in a space domain;

reconstructing a cyclically shifted hologram by applying said at least one cyclic shift on said portion; and

providing at least one cyclic shift comprises computing the cyclic shift; wherein

computing at least one cyclic shift includes creating an array of shifting points in a g-h plane of the single hologram and calculating a distance vector from an origin of the plane to a shifting point.

2. The method according to claim 1 wherein the at least a portion of the hologram is cyclically shifted over a distance vector corresponding to the shifting point in the g-h plane.

3. The method according to claim 2 comprising repeatedly cyclically shifting the at least a portion of the single hologram by moving within the array of shifting points from a first shifting point to a second phase shifting point in any order.

4. The method according to claim 2 comprising repeatedly cyclically shifting the at least a portion of the single hologram by moving within the array of shifting points from a first shifting point to a second phase shifting point in a raster pattern.

5. The method according to claim 4 wherein a horizontal distance between each two neighboring shifting points in the g-h plane is A/a, and a vertical distance is B/b, where A is a length of a pixel array and B a height of the pixel array.

6. The method according to claim 1 wherein the array of shifting points is a rectangular lattice of a×b points in the g-h plane, where “a” and “b” are each a number of points in a polygonal lattice of points where “a” does not equal “b”.

7. The method according to claim 6 wherein a horizontal distance between each two neighboring shifting points in the g-h plane is A/a, and a vertical distance is B/b, where A is a length of a pixel array and B a height of the pixel array.

8. The method according to claim 1 wherein the array of shifting points is a square lattice of c×c points in the g-h plane, where “c” is a number of points in a square lattice of points.

9. The method according to claim 8 wherein a horizontal distance and a vertical distance between each two neighboring shifting points in the g-h plane is C/c where C is a length and a height of a pixel array.

10. An apparatus for reconstructing a holographic projection comprising:

a coherent light source adapted to provide a coherent incident light to a spatial light modulator;

a processor adapted to provide a single hologram, including a cyclic shift module adapted to provide at least one cyclic shift of at least a portion of said single hologram in a space domain;

a spatial light modulator adapted to reconstruct a cyclically shifted hologram by applying said at least one cyclic shift on said at least a portion; wherein,

said cyclic shift module is further adapted:

to compute at least one cyclic shift of said at least a portion of said single hologram; and

to create an array of shifting points in a g-h plane of said single hologram and calculate a distance vector from an origin of the plane to a shifting point in order to compute said at least one cyclic shift of said at least a portion of said single hologram.

11. The apparatus according to claim 10 wherein the at least a portion of the single hologram is cyclically shifted over a distance vector corresponding to the shifting point in the g-h plane.

12. The apparatus according to claim 11 adapted to repeatedly cyclically shift the at least a portion of the single hologram by moving within the array of shifting points from a first shifting point to a second phase shifting point in any order.

13. A method for reducing speckle contrast in at least a portion of a hologram comprising:

providing said hologram;

creating an array of shifting points in a g-h plane of said hologram and calculating a distance vector from an origin of the plane to a shifting point; and

reconstructing a cyclically shifted hologram by cyclically shifting at least said portion of said hologram over a distance vector corresponding to the shifting point in the g-h plane.

14. The method according to claim 13 comprising repeatedly cyclically shifting the at least a portion of said hologram by moving within the array of shifting points from a first shifting point to a second phase shifting point in any order.

15. The method according to claim 14 comprising repeatedly cyclically shifting the at least a portion of the single hologram by moving within the array of shifting points from a first shifting point to a second phase shifting point in a raster pattern.

16. The method according to claim 15 wherein the array of shifting points is a rectangular lattice of a×b points in the g-h plane, where “a” and “b” are each a number of points in a polygonal lattice of points where “a” does not equal “b”.