Digital point spread function (DPSF) and dual modulation projection (including lasers) using DPSF

1. A dual modulation projector comprising a pre modulator, relay optics, and a primary modulator, and where pre-compensation for imperfections of the relay optics Point Spread Function (PSF) is made by modifying an image sent to the pre modulator, where the pre-modulator image is a halftone image on a Digital Micromirror Device (DMD), and the primary modulator is a DMD, where the halftone image is changed multiple times per frame, and where the bit sequences on the pre-modulator DMD and primary modulator DMD are synchronized, such that the average across the frame is the product of the average of the premodulator images through the relay optics and the primary modulator image;

wherein the projector is configured for projecting left and right images of a 3D image through glasses configured for viewing the 3D image;

wherein wavelengths of the left images originate from a laser light source illuminating the pre-modulator while being energized with a pre-modulator left image, wavelengths of the right images originate from a laser light source illuminating the pre-modulator while being energized with a pre-modulator right image; and

further wherein wavelengths of the modulated left image are passed through a corresponding left filter of the glasses and wavelengths of the modulated right image are passed through a corresponding right filter of the glasses and that spectral properties of pass areas of the filters are shifted toward longer wavelengths compared to wavelengths of light passing there through.

2. The projector of claim 1 where the pre-compensation filter is different for different regions of the image.

3. The projector of claim 2 where pre-compensation filter coefficients are calculated based upon PSF measurements and a reference desired PSF.

4. The projector of claim 1 , where additional compensation is made in the primary modulator.

5. The projector according to claim 1 , wherein the pre-modulator image comprises 1st and 2nd channel images of a 3D image.

6. The projector according to claim 1 , wherein the pre-modulator is illuminated by laser light sources.

7. The projector according to claim 1 , wherein the pre-modulator is illuminated by globally dimmed lasers.

8. The projector according to claim 1 , wherein the PSF comprises laser light.

9. The projector according to claim 1 , wherein the pre-modulator is illuminated by spatially modulated light.

10. The projector according to claim 1 , wherein the glasses comprise wavelength selective filters such that modulated wavelengths of the left images of the 3D image are passed by a left filter of the glasses and modulated wavelengths of the right image of the 3D image are passed by a right filter of the 3D viewing glasses and the filters comprise spectral properties that are offset relative to the wavelengths being viewed through the passbands.

11. The projector according to claim 1 , wherein the projector and glasses are arranged to allow for capturing laser wavelengths of compensated half-tone images further modulated for viewing at oblique angles.

12. The projector according to claim 1 , wherein the pre-modulator is energized in a manner so as to be compensated to account for wavelength differences and associated wavelength dependent PSF changes between different wavelengths of at least one of the same and different viewing channels.

13. The projector according to claim 1 , further comprising a controller configured to produce modulator energization data including PSF data adjusted by any of addition, subtraction, multiplication, and convolution.

14. The projector according to claim 1 , wherein image data applied to a modulator is synchronized with image data applied to other modulators in an image path of the projector.

15. The projector according to claim 1 , wherein a light path of the projector comprises at least one Liquid Crystal on Silicon (LCoS) modulator.

16. A dual modulation projector comprising a pre modulator, relay optics, and a primary modulator, and where pre-compensation for imperfections of the relay optics Point Spread Function (PSF) is made by modifying an image sent to the pre modulator, where the pre-modulator image is a halftone image on a Digital Micromirror Device (DMD), and the primary modulator is a DMD, where the halftone image is changed multiple times per frame, and where the bit sequences on the pre-modulator DMD and primary modulator DMD are synchronized, such that such that the average across the frame is the product of the average of the premodulator images through the relay optics and the primary modulator image;

wherein the projector is configured for projecting left and right images of a 3D image through glasses configured for viewing the 3D image;

wherein wavelengths of the left images originate from a laser light source illuminating the pre-modulator while being energized with a pre-modulator left image, wavelengths of the right images originate from a laser light source illuminating the pre-modulator while being energized with a pre-modulator right image; and

further wherein the pre-modulator is energized in a manner so as to be compensated to account for wavelength differences and associated wavelength dependent PSF changes between different wavelengths of at least one of the same and different viewing channels.

17. The projector of claim 16 where the pre-compensation filter is different for different regions of the image.

18. The projector of claim 17 where pre-compensation filter coefficients are calculated based upon PSF measurements and a reference desired PSF.

19. The projector of claim 16 , where additional compensation is made in the primary modulator.

20. The projector according to claim 16 , wherein the pre-modulator image comprises 1st and 2nd channel images of a 3D image.

21. The projector according to claim 16 , wherein the pre-modulator is illuminated by laser light sources.

22. The projector according to claim 16 , wherein the pre-modulator is illuminated by globally dimmed lasers.

23. The projector according to claim 16 , wherein the PSF comprises laser light.

24. The projector according to claim 16 , wherein the pre-modulator is illuminated by spatially modulated light.

25. The projector according to claim 16 , wherein the glasses comprise wavelength selective filters such that modulated wavelengths of the left images of the 3D image are passed by a left filter of the glasses and modulated wavelengths of the right image of the 3D image are passed by a right filter of the 3D viewing glasses and the filters comprise spectral properties that are offset relative to the wavelengths being viewed through the passbands.

26. The projector according to claim 16 , wherein the projector and glasses are arranged to allow for capturing laser wavelengths of compensated half-tone images further modulated for viewing at oblique angles.

27. The projector according to claim 16 , wherein the pre-modulator is energized in a manner so as to be compensated to account for wavelength differences and associated wavelength dependent PSF changes between different wavelengths of at least one of the same and different viewing channels.

28. The projector according to claim 16 , further comprising a controller configured to produce modulator energization data including PSF data adjusted by any of addition, subtraction, multiplication, and convolution.

29. The projector according to claim 16 , wherein image data applied to a modulator is synchronized with image data applied to other modulators in an image path of the projector.

30. The projector according to claim 16 , wherein a light path of the projector comprises at least one Liquid Crystal on Silicon (LCoS) modulator.