positive real function meaning in English

正实函数

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
摘要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。
Let f is a circularly symmetric function , , with constructing a positive real function and using integral method , the difference of the modular of successive coefficients of k symmetric functions of circularly symmetric functions is also obtained , which is a sharp estimate
当f为园对称函数， = 1 / k ( k = 2 ， 3 ， … )时，通过构造一个正实部函数，利用积分方法，得到了k次圆对称函数相邻系数模之差的精确估计。