Optical image encryption and decryption method based on biological information

The invention relates to an image encryption and decryption method based on biological information. The encryption method comprises the following steps: collecting biological information; preprocessing the biological information by using a chaotic mapping method, and constructing a first chaotic biological phase plate and a second chaotic biological phase plate; collecting a to-be-encrypted original image, and determining a reproduced light encrypted image by using the first chaotic biological phase plate and the second chaotic biological phase plate based on a discrete cosine transform methodand a Fresnel transform method; introducing reference light to interfere with the reproduced light encrypted image, and determining an encrypted image. According to the invention, the information amount of the key can be reduced, and the storage and transmission efficiency and safety are improved. 本发明涉及一种基于生物信息的图像加密、解密方法。该加密方法包括：获取生物信息；利用混沌映射方法，对所述生物信息进行预处理，构建第一混沌生物相位板以及第二混沌生物相位板；获取待加密的原始图像，利用第一混沌生物相位板以及第二混沌生物相位板，基于离散余弦变