This criterion can suppress the affection of minutiae to correlation coefficient and get a more accurate stopping time without knowing the noise variance.
该准则能有效抑制图像中高频信息的存在对相关系数计算的影响，获得准确的最优停止时间，并无需预先知道图像中的噪声水平。
The correlation coefficient is proposed as a criterion to determine the optimal parameter, and evaluate the performance of algorithms. The simulation results demonstrates its possibility.
并提出使用相关系数作为算法最优参数选取和性能评价的标准，计算机仿真实验结果证明了该方法的可行性。
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