Time-division multiplexing-based color holographic three-dimensional display method and system
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A time-division multiplexing, three-dimensional display technology, applied in optics, instruments, optical components, etc., can solve the problems of low preparation efficiency, restricting application promotion, and lack of mature prototypes and engineering applications.
Active Publication Date: 2016-09-14
SUZHOU UNIV
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However, the size of its recorded hologram is restricted by the size of the laser beam, which is limited in the application of making large-area holograms, which restricts its application in practice.
In 1969, Benton first used the two-step method to make a rainbow hologram. The rainbow hologram is the product of the combination of image holography and slits. It can reproduce holographic information under natural light. The recording optical path may have a greater energy utilization rate, but the disadvantage is that the two-step recording process is cumbersome, and due to the two-step recording, the noise of the hologr...
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Embodiment 1
[0053] A color holographic three-dimensional display method and system based on time division multiplexing, figure 1 is the overall technical roadmap of the present invention, including the following steps:
[0054] Step 1), acquiring a multi-view two-dimensional image of a color three-dimensional object. A full parallax image sequence of a color three-dimensional object within a viewing angle can be obtained by using a camera to scan and shoot or by using 3DSMAX, Maya and other commercial software by computer graphics.
[0055] Step 2), image preprocessing transformation. Decompose each acquired color perspective image into red (R), green (G), and blue (B) three-color component images (R 1 ,G 1 ,B 1 ;R 2 ,G 2 ,B 2 ;…R N ,G N ,B N ), the three-color component images can be regrouped to obtain a series of monochrome images (R 1 ,R 2 ,…R N ;G 1 ,G 2 ,…G N ;B 1 ,B 2 ,…B N ), after horizontal transformation, vertical transformation and pixel arrangement process...
Embodiment 2
[0083] Figure 7 This is a schematic structural diagram of the second embodiment of the color holographic three-dimensional display system based on time division multiplexing provided by the present invention. Its specific structure is similar to that of the first embodiment, and its implementation principle is the same as that of the first embodiment of the present invention. However, in this embodiment, the spatial light modulator 9 adopts a reflective phase modulation type spatial light modulator, and at the same time, an additional beam splitting prism 16 needs to be added.
[0084] To sum up, the present invention discloses a color holographic three-dimensional display method and system based on time division multiplexing. In the present invention, the method of time division multiplexing is used to realize the true color holographic three-dimensional display, which brings the observer a 3D experience and provides a color experience at the same time. Combining the spatia...
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Abstract
The invention belongs to the field of computer-generated holography and three-dimensional display, and particularly relates to a time-division multiplexing-based color holographic three-dimensional display method and system. By the display system, a multi-view two-dimensional image of a color target object is obtained by a method of CCD camera or computer graphics; a group of target images suitable for phase-type hologram calculation are generated after a preprocessing transformation process; a corresponding phase-type hologram is calculated by an iterative Fourier transform algorithm and is loaded to a spatial light modulator in a time-division manner; a synchronization control circuit controls red, green and blue three-color light sources to synchronously display in sequence; and three monochromatic holographic reconstructed images are generated on a reconstruction plane in a time-division manner, and corresponding reconstructed image pixels are directionally diffracted to the position at which a pixel-type nano grating is fixed to form different viewpoints, thereby obtaining multi-view color reconstructed images and achieving true color three-dimensional display. The hologram is quickly refreshed and loaded by combining the spatial light modulator, so that the multi-view real color full-parallax dynamic holographic three-dimensional reconstruction of the target object is achieved.
Description
technical field [0001] The invention relates to a color three-dimensional display method, in particular to a color holographic three-dimensional display method and system based on time division multiplexing, and belongs to the field of computational holography and three-dimensional display. Background technique [0002] With the rapid development of display technology and computer science, people have put forward higher requirements for display technology in medical imaging, commercial art, military and national defense, etc. These requirements are far beyond the scope of current two-dimensional (2D) display. Therefore, true-color three-dimensional (3D) display has become an inevitable demand of modern information society and an important goal of modern display technology development. As a near-perfect imaging technology, color holographic 3D display can not only provide true-color 3D images that are almost close to the real world, but also provide 3D vision from all viewpoi...
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