基于位置和波长参量的并行复用,提出一种高加密容量的光学干涉多图像加密系统.加密时，待加密图像分为两组，每组均利用位置复用技术解析地加密到两个纯相位板中,将所获取的四个相位板再经波长复用技术融合到两个光学相位元件中.加密过程采用数字技术，无需使用迭代算法，而解密过程既可以采用数字技术也可以采用纯光学方法.实验中利用波长与位置的并行复用及相关系数对系统的加密容量进行评估，同时研究了系统对于噪音攻击和剪切攻击的稳健性.结果表明：加密容量较已有方法有较大提高；对于噪音攻击的稳健性较强，但是对于剪切攻击的稳健性较弱.

A novel interference-based multiple-image encryption method with high encryption capacity was proposed by position and wavelength multiplexing. For encryption, the original images to be encrypted were divided into two groups, and each group of target images was analytically hidden into two phase only masks by position multiplexing. Subsequently the obtained four phase only masks were further merged into two diffractive phase elements by wavelength multiplexing. The encryption process did not need iterative algorithm and should be implemented digitally, while the decryption process could be performed both digitally and optically. The encryption capacity of the system was evaluated with correlation coefficient, and it was shown that the capacity was greatly improved due to the introduction of both position and wavelength multiplexing. In addition, the robustness of the proposal against noise and occlusion was also investigated, and the results indicated that the proposal is of high robust against noise attack but a little vulnerable to occlusion attack.