Complex amplitude hologram algorithm based on light field

A technology of complex amplitude and hologram, applied in the field of complex amplitude hologram algorithm based on light field, can solve the problems of occlusion caused by calculation speed and decrease of calculation amount, so as to achieve good reconstruction effect and improve the effect of grid pattern.

Pending Publication Date: 2020-01-31
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

The first two methods have problems in calculation speed and occlusion, and there is no perfect method to completely solve them. However, the stereo holography method uses the theory of light field to obtain the original light field image that records the light intensity and direction information. A series

Method used

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  • Complex amplitude hologram algorithm based on light field
  • Complex amplitude hologram algorithm based on light field
  • Complex amplitude hologram algorithm based on light field

Examples

Experimental program
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Embodiment

[0093] Embodiment: choose the AB letter of two planes as reconstruction object, as Figure 5 shown. Assuming that a total of 9×9 subgraphs are required, as shown in Table 1, the subscript of each subgraph is represented by two numbers. First, it is necessary to determine the shooting position of each sub-image, that is, the coordinate value of the virtual camera. Second, it is necessary to determine the angle value of the sub-image at each position relative to the coordinate axis, that is, the parameter value of the inclined plane wave in the program.

[0094] Table 1

[0095]

[0096] Set letter A to be at 20cm on the y-axis, letter B to be at -15cm on the y-axis, and the virtual camera to always focus on the origin. The observation plane is set at -100cm on the y-axis, and the horizontal or vertical spacing of each viewpoint is 0.5cm. Therefore, the position of the virtual camera at each viewpoint can be obtained based on these. Since 81 viewpoints are symmetrical, some...

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Abstract

The invention discloses a complex amplitude hologram algorithm based on a light field, and the algorithm comprises the steps: firstly carrying out the multi-angle photographing of a three-dimensionalobject through a virtual camera, and obtaining a series of subgraphs; then adding an inclination phase factor of a corresponding angle to each sub-image in an algorithm, and adding the obtained imagesto obtain a complex amplitude hologram; or, displacing the frequency spectrum of each sub-image in the frequency domain space, enabling the displacement to correspond to the angle information duringshooting, and adding the sub-images of which the frequency spectrum positions are moved to obtain a complex amplitude hologram; and finally, modulating the obtained complex amplitude hologram by usinga complex amplitude modulation device so as to reconstruct the three-dimensional object. According to the algorithm, a three-dimensional light field closer to a natural scene can be reconstructed, the calculation speed of a hologram is increased, and meanwhile, a reconstruction light path is simplified.

Description

technical field [0001] The invention relates to a hologram calculation method, in particular to a complex amplitude hologram algorithm based on light field. Background technique [0002] Holographic display is considered to be the most promising development direction in the field of 3D display in the future because it can reconstruct the complete light field of a 3D scene and provide all the depth cues required by human perception. With the continuous development of computer technology and liquid crystal display technology, we can get rid of the complex interference recording process in traditional holography, without using the recording dry plate of high coherence light source system, and numerically calculate the hologram in the computer to reconstruct the real existence or later Synthetic scenes, as long as the three-dimensional scene can be described mathematically. [0003] According to different representations of 3D scenes, computer holograms can be divided into thre...

Claims

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Application Information

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IPC IPC(8): G06T17/00
CPCG06T17/00G06T2207/20056
Inventor 张天天夏军
Owner SOUTHEAST UNIV
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