Color image optical encryption method

An encryption method and color image technology, applied in the field of image processing, can solve problems such as inconvenient key storage, distribution and practical application, increased key storage space, increased key leakage, etc., to achieve airspace overlap and frequency Effects of domain separation, small key space, and uniform gray distribution

Active Publication Date: 2021-10-08
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

Multi-channel encryption is mainly based on the principle of color three primary colors. RGB channels are regarded as three sub-gray images and each channel component is processed separately in the process of encryption and decryption. The disadvantage of this type of method lies in the implementation of its encryption (decryption) encryption system. The cost is relatively high, and the key storage space increases with the increase of the number of phase masks, which is not convenient for key storage, di

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  • Color image optical encryption method
  • Color image optical encryption method

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Embodiment Construction

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0038] In describing the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or element...

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Abstract

The invention relates to the technical field of image processing, and discloses a color image optical encryption method, which can be regarded as two encryption operations as a whole: in the first encryption operation, RGB channel components of a color image are converted into a real-value computer-generated hologram by using Fresnel diffraction to realize hiding of pixel information of a plaintext image; and information crosstalk between RGB channel components is overcome by comprehensively setting diffraction distance and reference light direction parameters to adjust the position of a reproductive image of each channel component, so that the color component of each channel can be accurately recovered in the decryption process; in the second encryption operation, the pixels of the computer-generated hologram are replaced and diffused by using a transformed Logistic chaotic system to obtain a meaningless white noise image as a final ciphertext image; the encryption operation enhances the sensitivity of the ciphertext to the plaintext change by means of the chaotic system characteristics and the diffusion mechanism, enhances the ability of the ciphertext to resist statistical attack and ciphertext-only attack, and further improves the system security.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an optical encryption method for color images. Background technique [0002] The existing color image encryption methods can be roughly divided into two categories: multi-channel encryption and single-channel encryption. Multi-channel encryption is mainly based on the principle of color three primary colors. RGB channels are regarded as three sub-gray images and each channel component is processed separately in the process of encryption and decryption. The disadvantage of this type of method lies in the implementation of its encryption (decryption) encryption system. The cost is relatively high, and the key storage space increases with the increase of the number of phase masks, which is not convenient for key storage, distribution and practical application; in addition, although the encryption and decryption processes between channels are independent of each other, the k...

Claims

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Application Information

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IPC IPC(8): G06F21/60G06N7/08
CPCG06F21/602G06N7/08
Inventor 吴军王刚沈伊人
Owner GUILIN UNIV OF ELECTRONIC TECH
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