基于4f双随机相位图像加密技术,采用多重栅距计算光栅密钥代替随机相位密钥,给出一种以有序代替无序的新型数字图像加密解密技术。通过控制计算光栅密钥的光栅常数、维度及栅距个数,最大限度的扰乱原始图像的频谱,保证加密的安全性,同时提高了加密解密的可控性,突破随机光学密钥难以复位的瓶颈,大大提高了光学密钥实际应用的可行性。 Based on the 4f dual random phase image encryption technology, a new type of digital image encryption and decryption technology is proposed by replacing the random phase key with the multi-pitch computing raster key. By controlling the grating constant, dimension and the number of grids of the grating key, the spectrum of the original image can be disturbed to the maximum to ensure the security of the encryption, meanwhile, the controllability of the encryption and decryption is improved, and the random optical key is difficult to be reset Bottleneck, greatly improving the feasibility of practical application of optical key.