Efficiently generating a high quality patterned-phase-only hologram for display on a single device
System and methods for efficiently generating a high quality patterned-phase-only hologram that can be displayed on a single device. A digital image of a holographed subject is measured as a distribution of the intensity of pixels in the image, or as an intensity image, and uniformly partitioned into a plurality of non-overlapping image blocks. A phase mask is applied to each pixel in each image block and assigned a value in the range of [0,2π). The pixels are modulated with a phase value corresponding to the value applied by the phase mask, creating a modified intensity image. A complex hologram is generated from the modified intensity image. The complex hologram is generated utilizing a fast hologram generation process and then converted into a patterned-phase-only hologram. A short sequence of the patterned-phase holograms can be displayed to enhance the visual quality of the displayed holographic images.
1. A method for displaying a holographic image generated from a patterned-phase-only hologram on a single display device, the method comprising:
receiving, by one or more processors, image data for a source object;
converting, by the one or more processors, the image data for the source object into an intensity image of the source object;
partitioning, by the one or more processors, the intensity image of the source object into a plurality of uniform, non-overlapping image blocks;
applying, by the one or more processors, a phase mask to one or more pixels in the plurality of uniform, non-overlapping image blocks;
modulating, by the one or more processors, the one or more pixels in the plurality of uniform, non-overlapping image blocks to which the phase mask is applied with a phase value to create a modified intensity image of the source object, where modulating the one or more pixels in the plurality of uniform, non-overlapping image blocks comprises:
assigning a phase value to only pixels determined not to comprise a line or an edge in the intensity image of the source object;
generating, by the one or more processors, a complex hologram from the modified intensity image of the source object and a corresponding depth map utilizing a fast hologram generation method;
converting, by the one or more processors, the generated complex hologram to a patterned-phase-only hologram; and
displaying, at a single hologram display device communicatively coupled to the one or more processors, one or more holographic images based on the patterned-phase-only hologram.
2. The method of claim 1 where applying the phase mask comprises assigning a phase value in the range of [0,2π) to the one or more pixels in one or more image blocks.
3. The method of claim 1 where modulating the one or more pixels in the image blocks to which the phase mask is applied with a phase value comprises:
assigning a phase value to each pixel in the intensity image of the source object.
4. The method of claim 1 where converting the generated complex hologram comprises:
setting an amplitude value of each pixel in the generated complex hologram to a common value, and
retaining a phase value of each pixel in the generated complex hologram.
5. The method of claim 1 where displaying one or more holographic images based on the patterned-phase-only hologram comprises:
utilizing a short sequence of patterned-phase-only holograms to enhance the visual quality of the one or more holographic images.
6. The method of claim 5 where the single hologram display device comprises a phase-only spatial light modulator (SLM).
7. A system for generating a phase-only holographic image that is displayed on a single display device, the system comprising:
a memory;
one or more processors coupled to the memory, the one or more processors:
receiving, by one or more processors, image data for a source object;
converting, by the one or more processors, the image data for the source object into an intensity image of the source object;
partitioning, by the one or more processors, the intensity image of the source object into a plurality of uniform, non-overlapping image blocks;
applying, by the one or more processors, a phase mask to one or more pixels in the plurality of uniform, non-overlapping image blocks;
modulating, by the one or more processors, the one or more pixels in the plurality of uniform, non-overlapping image blocks to which the phase mask is applied with a phase value to create a modified intensity image of the source object, where modulating the one or more pixels in the plurality of uniform, non-overlapping image blocks comprises:
assigning a phase value to only pixels determined not to comprise a line or an edge in the intensity image of the source object;
generating, by the one or more processors, a complex hologram from the modified intensity image of the source object and a corresponding depth map utilizing a fast hologram generation method;
converting, by the one or more processors, the generated complex hologram to a patterned-phase-only hologram; and
a holographic image display device coupled to the one or more processors, the holographic image display device displaying one or more holographic images based on the patterned-phase-only hologram.
8. The system of claim 7 where applying the phase mask comprises assigning a phase value in the range of [0,2π) to the one or more pixels in one or more image blocks.
9. The system of claim 7 where modulating the one or more pixels in the image blocks to which the phase mask is applied with a phase value comprises:
assigning a phase value to each pixel in the intensity image of the source object.
10. The system of claim 7 where converting the generated complex hologram comprises:
setting an amplitude value of each pixel in the generated complex hologram to a common value, and
retaining a phase value of each pixel in the generated complex hologram.
11. The system of claim 7 where displaying one or more holographic images based on the patterned-phase-only hologram comprises:
utilizing a short sequence of patterned-phase-only holograms to enhance the visual quality of the one or more holographic images.
12. The system of claim 11 where the hologram image display device comprises a phase-only spatial light modulator (SLM).