optical subtraction meaning in Chinese

光学相减

The proposed method realized binary image encryption with optical subtraction rather then multiplying , and the encrypted date are recorded as the magnitude squared of the amplitude and phase information
理论分析和计算机模拟实验表明,该方法是完全可行的,并且最后获得的加密图像是实数,便于直接打印输出。
The position of phase mask also can be used as a key of the system besides the phase codes . the key space is significantly enlarged , and high security is consequently achieved . finally , a method of binary image encryption with optical subtraction based on mach - zehnder interferometer architecture is proposed
最后,针对二值图像的特点,提出一种通过直接扰乱图像分布达到加密目的新方法,该方法不是用传统的相乘编码,而是把待加密二值图像与一块随机二值实振幅掩模通过光学图像相减技术来实现加密编码。