That is, if we include the double blank there are four patterns.
这就是说, 包括两个空位在内,总共有四种孔型.
For the positive real function image encoded by double random-phase, the first random-phase mask placed in the blank can not serve as the key when the decrypted image is detected by intensity detector in the decrypting process.
正的实函数图像通过双随机相位编码加密以后,在解密过程中,用光强探测器接收解密图像时,位于空域的第1块相位掩模不起密匙作用。
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