CN110083042B - Large-size holographic display method based on effective utilization of two spatial light modulators - Google Patents
Large-size holographic display method based on effective utilization of two spatial light modulators Download PDFInfo
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- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/0005—Adaptation of holography to specific applications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
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- G—PHYSICS
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- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2202—Reconstruction geometries or arrangements
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- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/0005—Adaptation of holography to specific applications
- G03H2001/0088—Adaptation of holography to specific applications for video-holography, i.e. integrating hologram acquisition, transmission and display
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- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
- G03H2001/0208—Individual components other than the hologram
- G03H2001/0224—Active addressable light modulator, i.e. Spatial Light Modulator [SLM]
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Abstract
The invention provides a large-size holographic display method based on effective utilization of two spatial light modulators, which comprises the following three steps: firstly, dividing the information of an object into two equal parts, extracting the two parts into two information groups, namely an information group 1 and an information group 2, and respectively analyzing the reconstructed image effective visual areas of the two information groups; secondly, respectively calculating central stripe patterns of the two information groups based on effective visual area analysis, respectively generating holograms of the two information groups through translation and superposition operations, adjusting the position of a reconstructed image by using a blazed grating in order to realize seamless splicing of the reconstructed image, and combining phase information of the blazed grating with the holograms of the two information groups through superposition operations to generate two final holograms; and thirdly, loading the final holograms of the two information groups on the two SLMs respectively, and reproducing a large-size reconstructed image by a spatial multiplexing method.
Description
One, the technical field
The invention relates to a holographic display technology, in particular to a large-size holographic display method based on effective utilization of two spatial light modulators.
Second, background Art
With the rapid development of information technology in recent years, three-dimensional display technology has received more and more attention in the fields of media, entertainment, medical treatment, and the like. Spatial Light Modulator (SLM) based computed holography techniques can reconstruct all the information of real or virtual objects and are therefore considered ideal three-dimensional displays. Despite the great advances made in all respects in computational holographic displays to date, several challenges remain. For example, due to the size limitation of SLM pixels on the market, it is difficult to obtain a large-sized reconstructed image, so that the development of the computer hologram is limited. To obtain large-size holographic reconstruction images, some researchers have employed single SLM-based time-division multiplexing. However, this approach places high demands on optics and SLM refresh rates. Some teams achieve large-size holographic reconstruction by using a concatenation of multiple SLMs. However, systems with multiple SLMs have limited utility due to their complex structure, difficulty in achieving seamless tiling, and the like. Furthermore, the size of the reconstructed image can also be changed to some extent by adjusting the pixel pitch of the original image, but the magnification of the reconstructed image is still limited by the SLM sampling pitch.
Third, the invention
The invention provides a large-size holographic display method based on effective utilization of two spatial light modulators. As shown in fig. 1, the method comprises the following three steps: the method comprises the following steps that firstly, an object is divided into two equal parts in space, the two equal parts are extracted into two information groups, namely an information group 1 and an information group 2, and the effective visual areas of reconstructed images of the two information groups are analyzed respectively; secondly, respectively calculating central stripe patterns of the two information groups based on effective visual area analysis, respectively generating holograms of the two information groups through translation and superposition operations, adjusting the position of a reconstructed image by using a blazed grating in order to realize seamless splicing of the reconstructed image, and combining phase information of the blazed grating with the holograms of the two information groups through superposition operations to generate two final holograms; and thirdly, loading the final holograms of the two information groups on the two SLMs respectively, and reproducing a large-size reconstructed image by a spatial multiplexing method.
In step one, the object is spatially divided into two equal parts and extracted into two information sets, and in the holographic display, the size and the viewing angle of the reconstructed image are expressed by the following formula:
in order to increase the size of the reconstructed image while ensuring the angle of view of the reconstructed image, the method used by the invention increases the number of pixels by using the two SLMs, divides the object into two groups of information, and determines the effective area of the SLM and the size of the effective hologram by analyzing the effective visual area of the reconstructed image.
In step two, the holograms of the two information sets are calculated separately using a novel look-up table method. The object is considered to be composed of a series of discrete points, central fringe patterns of the two information groups are respectively calculated according to the size of the effective hologram, and fringe patterns of other points are calculated through the translation and superposition principles, so that holograms of the two information groups are respectively generated. The position of the reconstructed image is adjusted through the blazed grating, and seamless splicing of the two information group reconstructed images is achieved. As shown in figure 2, an SLM with a pixel structure is regarded as a blazed grating which has a phase modulation function and can modulate a light wave in a period of 2 pi, the position of a reconstructed image is changed by changing the diffraction direction of the light wave, the phase information of the blazed grating is added with holograms of two information sets, the position of the image is adjusted, and the phase of the blazed grating
Represented by the formula:
where θ is the angle of deflection of the light wave. Blazed gratings with different deflection angles can be obtained by controlling the value of theta. Loading the phases of blazed gratings separatelyOn holograms of two information sets, the resulting hologram phase
Represented by the formula:
where mod is the operation of the modulo operation,
is the initial hologram phase for both sets of information.
In the third step, the final holograms generated in the second step are respectively loaded on the two SLMs, the size of the reconstructed image is enlarged by a spatial multiplexing method, and the reconstructed images of the two SLMs are completely overlapped by controlling the phase of the blazed grating, so that the large-size reconstructed image is reproduced.
Preferably, the two SLMs are of the same model, the size of the object is smaller than the size of the SLM, the size of the central fringe pattern, the size of the active area of the SLM and the size of the final hologram are the same and are both smaller than the size of the SLM. The method provided by the invention can increase the calculation speed of the hologram while enlarging the size of the reconstructed image.
Description of the drawings
FIG. 1 is a schematic diagram of a large-size holographic display method based on two SLMs according to the present invention.
Fig. 2 is a schematic diagram of the structure of a blazed grating of the present invention.
It should be understood that the above-described figures are merely schematic and are not drawn to scale.
Fifth, detailed description of the invention
The present invention will be further described below in detail with reference to an embodiment of a large-sized holographic display method based on effective utilization of two spatial light modulators according to the present invention. It should be noted that the following examples are only for illustrative purposes and should not be construed as limiting the scope of the present invention, and that the skilled person in the art may make modifications and adaptations of the present invention without departing from the scope of the present invention.
One embodiment of the invention is: a collimated light source with the wavelength of 532nm is used as a reproduced light wave, the models of the two SLMs are the same, the pixel spacing and the resolution of the SLMs are respectively 6.4 mu m and 1920 multiplied by 1080, the addressable gray scale is 256 steps, 2 pi phase modulation can be provided, and the refreshing speed is 60 HZ. Spatial multiplexing of the two SLMs is achieved with a beam splitter, and holograms are generated based on MATLAB software using a picture with a resolution of 320 x 240 as the object. Firstly, dividing an object into two information groups with the resolution of 320 multiplied by 240, respectively calculating the central fringe patterns of the two information groups based on an effective visual area, wherein the resolution is 1600 multiplied by 840, respectively generating holograms of the two information groups through displacement and superposition operations, wherein the resolution of the holograms is 1600 multiplied by 840, and adding the phase information of the blazed grating and the phase information of the two information groups to generate a final hologram. The final holograms are loaded on the two SLMs respectively, and when the reproduction light irradiates the SLMs, a large-size holographic reconstruction image can be obtained.
Claims (5)
1. A large-size holographic display method based on effective utilization of two spatial light modulators is characterized by comprising the following three steps: the method comprises the following steps that firstly, an object is divided into two equal parts in space, the two equal parts are extracted into two information groups, namely an information group 1 and an information group 2, and the effective visual areas of reconstructed images of the two information groups are analyzed respectively; secondly, respectively calculating central stripe patterns of the two information groups based on effective visual area analysis, respectively generating holograms of the two information groups through translation and superposition operations, adjusting the position of a reconstructed image by using a blazed grating in order to realize seamless splicing of the reconstructed image, and combining phase information of the blazed grating with the holograms of the two information groups through superposition operations to generate two final holograms; and thirdly, loading the final holograms of the two information groups on the two SLMs respectively, and reproducing a large-size reconstructed image by a spatial multiplexing method.
2. A large-size holographic display method based on the effective utilization of two spatial light modulators according to claim 1, characterized in that in step one, the object is spatially divided into two equal parts and extracted into two information sets, and in the holographic display, the size and viewing angle of the reconstructed image are expressed by the following formula:
in order to increase the size of the reconstructed image while ensuring the visual angle of the reconstructed image, the number of pixels is increased by using the two SLMs, an object is divided into two groups of information, and the effective area of the SLM and the size of the effective hologram are determined by analyzing the effective visual area of the reconstructed image.
3. A large-sized holographic display method based on the effective utilization of two spatial light modulators according to claim 1, characterized in that in step two, the holograms of two information sets are respectively calculated by using a novel lookup table method, the object is regarded as being composed of a series of discrete points, the central fringe patterns of the two information sets are respectively calculated according to the size of the effective hologram, and the fringe patterns of other points are calculated by the principles of translation and superposition, so that the holograms of the two information sets are respectively generated; the position of the reconstructed image is adjusted through the blazed grating, and seamless splicing of the two information group reconstructed images is realized; the SLM with the pixel structure is regarded as a blazed grating which has a phase modulation function and can modulate light waves in a period of 2 pi, the position of a reconstructed image is changed by changing the diffraction direction of the light waves, the phase information of the blazed grating is added with the holograms of two information groups, and the adjustment of the position of the image is realized, and the phase of the blazed grating
Represented by the formula:
wherein theta is the deflection angle of the light wave, the blazed gratings with different deflection angles can be obtained by controlling the value of theta, the phases of the blazed gratings are loaded on the holograms of the two information groups respectively, and the final phase of the hologram is obtained
Represented by the formula:
where mod is the operation of the modulo operation,
is the initial hologram phase for both sets of information.
4. The large-size holographic display method based on the effective utilization of two spatial light modulators according to claim 1, characterized in that in step three, the final hologram generated in step two is loaded on two SLMs respectively, the size of the reconstructed image is enlarged by the spatial multiplexing method, and the reconstructed images of the two SLMs are completely overlapped by controlling the phase of the blazed grating, thereby reproducing the large-size reconstructed image.
5. A large-size holographic display method based on the efficient utilization of two spatial light modulators according to claim 1, characterized in that the models of the two SLMs are the same, the size of the object is smaller than the size of the SLM, the size of the central fringe pattern, the size of the active area of the SLM and the size of the final hologram are the same and are both smaller than the size of the SLM.
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