Time-division multiplexing-based color holographic three-dimensional display method and system

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...

AI Technical Summary

Problems solved by technology

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 hologram is relatively large

However, in order to achieve true color display, the article uses a hexagonal structure light guide plate to realize the directional export of red, green and blue light. However, this hexagonal light guide plate does not match the existing flat panel display methods.

Moreover, the preparation of nano-gratings by electron beam exposure has low preparation efficiency and high cost, which also limits its application in display.

[0011] In China, the research on color dynamic holographic three-dimensional display is still in its infancy, and there are no relatively mature prototypes and engineering applications.

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