threshold magnitude meaning in English

临界震级

Secondly , the nonlinear joint transform correlation recognition and the photorefractive correlation recognition are investigated by computer simulation and experiment , and the research results are given as following : ( 1 ) the correlation discrimination of the jtc can be greatly improved by binarizing the joint transform power spectrum nonlinearly . it is found in our experiment that the threshold magnitude has great influence on the correlation output of a binary jtc
其次，通过理论分析、计算机模拟和实验研究的方法，对非线性联合变换相关识别和光折变光学相关识别进行了研究，并给出了研究结果： ( 1 )对联合变换功率谱进行二值化处理可以使得功率谱高频成份得到较大提高，从而大大提高联合变换相关器的识别能力。