Multi-complex three-dimensional scene encryption and decryption method based on the kinoform and Fresnel domain multiplexing

Abstract

The present invention discloses a multi-complex three-dimensional scene encryption and decryption method based on the kinoform and Fresnel domain multiplexing. The method comprises: starting from a complex three-dimensional scene characterized by a color image and a depth map, using a computational holography coding method to generate a computational kinoform that can be used for true three-dimensional reconstruction, wherein the kinoform shows random signal characteristics; superimposing the kinoform recording a single complex three-dimensional scene by using the Fresnel domain distance multiplexing method to generate a Fresnel diffraction distribution containing multiple three-dimensional scenes; and finally, using a phase template decomposition method for the diffraction signal and theinterference suppression signal which contain multiple three-dimensional scenes to obtain an encrypted and decrypted phase template. In order to suppress the speckle noise in the reconstructed three-dimensional scene, the multiplexed signal contains multiple kinoforms from the same three-dimensional scene, and the intensities of the light wave signals reconstructed by different kinoforms from thesame three-dimensional scene are averaged in the decryption phase to improve the quality of reconstruction. According to the method provided by the present invention, a three-dimensional scene can still be reconstructed in the case that the encrypted phase template suffers from large area shearing or is superimposed with a certain intensity of Gaussian noise, and the method has good security and robustness.

Description

technical field [0001] The invention relates to a three-dimensional scene encryption technology, in particular to a multi-complex three-dimensional scene encryption and decryption method based on kinoform and Fresnel domain multiplexing. Background technique [0002] Three-dimensional vision can provide depth information of natural scenes, and can bring viewers a sense of depth and immersion. Broad room for development. Stereophotography and holography are the two main means of recording three-dimensional scenes. Stereo photography uses imaging equipment to obtain binocular stereo images of 3D scenes based on the principle of parallax. Through the processing of binocular stereo images, a depth map that reflects the depth of field changes in 3D scenes can be obtained. Stereoscopic effect viewing generally requires wearing glasses, helmets and other auxiliary equipment, and is prone to visual fatigue and limited viewing angles; holograms use holograms to record interference ...

AI Technical Summary

Problems solved by technology

However, limited by the size and resolution of the CCD area array, the size and complexity of the three-dimensional objects recorded in digital holography are limited, and lasers are required as light sources, and the shooting conditions are high.

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