Image encryption and decryption method for random size segmentation structured phase plate

• Main Authors: TANG YUNHAI, WANG JUN, SUN WENQING, WU QUANYING, CHEN BAOHUA, FAN JUNLIU
• Format: Patent
• Language: Chinese; English
• Published: 11.01.2019
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

The invention relates to an image encryption and decryption method for a random size segmentation structured phase plate. Firstly, in the encryption side, a random phase plate is decomposed into a series of sub-blocks of random sizes. Then, two random phase plates are generated by filling each sub-block with the structure function generated by random parameters. Then, the amplitude image is encrypted using a dual random encryption system. Finally, in the decryption side, the conjugate phase plate is used to decrypt the image and recover the original image. The method of the invention can better improve the randomness of the encrypted image and the security of the encryption system. The method can be used for encrypting the color image, the hyperspectral image and a plurality of images besides encrypting the gray-scale image, and has excellent social and economic benefits. 本发明涉及种使用随机尺寸分割的相位模板进行图像加密与解密的方法。首先，在加密方，将随机相位板分解为系列随机大小的子块；然后，使用随机参数生成的结构函数对每个子块进行填充，按照此方法生成两块随机相位板；接着，使用双随机加密系统对振幅图像进行加密；最后，在解密方，使用共轭的相位板对