A multi-image encryption method and decryption method based on light field sub-aperture images
An encryption method and light field image technology, applied in the field of multi-image encryption and decryption, can solve the problems of limited effective collection distance of encrypted images, distortion or loss of key information of decrypted images, and inconsistent decryption and reconstruction methods. Improve encryption security, reduce complexity, and improve the effectiveness of encryption
Active Publication Date: 2021-07-13
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology
When light field imaging is used for image encryption, someone proposes to encrypt a single target image through an actual lens array. Due to the information redundancy generated by adjacent lenses and the dispersion of the imaging of plaintext information by the lens array, it can protect the plaintext. However, in the encryption process, the effective acquisition distance of the encrypted image is limited, and in the image restoration process, due to the high correlation between the decryption algorithm and the encrypted image, the reconstruction effect of the decrypted image is more dependent on the image decryption algorithm. High, the decryption and reconstruction methods do not have the same identity, and the decryption methods of different images will cause the key information of the decrypted image to be easily distorted or lost
Moreover, the number of encrypted images is limited to a single image, and the amount of calculation itself is relatively large, so the encryption efficiency is low
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[0054] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described below.
[0055] Encrypt the image:
[0056] Step 1.1: Combine multiple images 1 to be encrypted into one image in any order, such as image 3 As shown, wherein, the number of images to be encrypted is A×A (without loss of generality, A×A=3×3 is selected in the embodiment), and the number of pixels of a single image is B×B (without loss of generality, In the embodiment, select B×B=500×500), the total number of pixels of the spliced combined image is: A×A×B×B=1500×1500.
[0057] Step 1.2: Build a light field imaging system based on the microlens array3
[0058] Such as figure 1 As shown, the light field imaging system is constructed in the computer, without loss of generality, wherein the magnification of the main lens 2 is taken as 1; Microlens array 3; And the discrete image receiver 4 (such as ...
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The present invention proposes a multi-image encryption method and decryption method based on light field sub-aperture images. The present invention is based on the light field imaging mode of the microlens array. The entire encryption process is simple, the key space is large, and the key sensitivity is very high. The encryption of multiple images is completed at one time, which greatly reduces the complexity of multiple image encryption and improves the encryption efficiency; moreover, multiple images are fused into one encrypted image, which is beneficial to the network transmission of image information; the invention of this method can construct multiple The light field imaging system forms a cascaded encryption system, further expands the key space, and improves encryption security; the present invention can be easily combined with other two-dimensional encryption methods to further improve the encryption effect; this method can be realized by optical methods, and also It can be implemented in a computer by means of computational imaging.
Description
technical field [0001] The invention relates to the technical field of image processing, in particular to a multi-image encryption method and decryption method based on light field sub-aperture images. Background technique [0002] With the continuous development of Internet technology and information technology, multimedia data such as audio, pictures, video, etc. are more and more widely used, and as a kind of network information transmission resource, with its universality, shareability, processability and multi-utility Sex has become an indispensable part of all walks of life including politics, economy, military affairs, education and so on. [0003] Among them, image encryption technology is the core technology in multimedia information security, while the calculation object of traditional data encryption algorithm is mainly text data or binary data, and the calculation complexity is usually high. Therefore, the traditional data encryption algorithm cannot meet the ch...
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IPC IPC(8): H04N1/32H04L9/14H04L29/06G06T3/40G06T5/50G06T9/00G06T7/11G06F21/60H04L9/00
CPCG06F21/602G06T3/4038G06T5/50G06T9/00G06T2200/32G06T2207/10052G06T7/11H04L9/001H04L9/14H04L63/0478H04N1/32267H04N1/32272
Inventor张薇韩思敏张翔
OwnerUNIV OF SHANGHAI FOR SCI & TECH