Three-dimensional image optical reconstruction method and system based on phase shift compression Fresnel holography

Abstract

The invention discloses a three-dimensional image optical reconstruction method and system based on phase shift compression Fresnel holography, and belongs to the technical field of data security, andthe method comprises the steps: carrying out the encryption of a three-dimensional object through a random phase mask, and obtaining three different holograms through the three different phase shiftsof reference light; calculating the complex amplitude of the object light field from the three different holograms by using a three-step phase shift method; and reconstructing the three-dimensional object from the complex amplitude of the object light field by using a compressed Fresnel holographic method and a secret key. According to the method, firstly, a complex object light field on a CCD imaging detector plane is calculated by using a three-step phase shift method for a hologram of a three-dimensional object obtained by encryption, and then a three-dimensional image is reconstructed byusing a compressed Fresnel holographic technology and a correct secret key, so that the interference of a square field term and a direct current term is effectively avoided, and the feasibility and superiority of image reconstruction are superior to those of the traditional method.

Description

technical field [0001] The invention relates to the technical field of data security, in particular to a three-dimensional image optical reconstruction method and system based on phase shift compression Fresnel holography. Background technique [0002] With the rapid development of the information age, more and more people pay attention to information security, and image security is becoming more and more important in many current fields. Image security includes many aspects, such as image encryption, image watermarking and image hiding, which have been widely used in many fields, such as military, medical, security and so on. In recent years, due to the good parallel characteristics of optical encryption, the fast realization of convolution and correlation operations, the fast processing speed, and the ability to record information with multiple attributes such as amplitude and phase, it has great advantages compared with the use of electronic hardware devices. Optical inf...

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Problems solved by technology

[0005] However, these methods are only aimed at two-dimensional images. Since three-dimensional images have the characteristics of clear layers, strong intuition, large amount of information, and vivid images, the encrypted objects are extended to three-dimensional (3-dimensional, 3D) objects. Due to the compressed holographic imaging process There is interference between the square field term and the DC term, and it is found through simulation experiments that the reconstruction effect obtained by using the CHPS method is not ideal

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