This paper introduces one item named variance rate of gray level and improves the maximum-minimum method by simplifying the noise examination process for suppressing the random impulsive noise.
引入灰度变化率的概念，并据此提出了一种去除随机脉冲噪声的改进算法，将其用于噪声点的检测，简化了最大-最小值方法中的噪声检测过程。
Methods 696 community residents over 35 years old were selected by random cluster sampling, questionnaire, physical examination and blood glucose examination.
方法采用整群随机抽样的方法抽取696名35岁以上社区居民，开展问卷调查并进行体格检查及血糖检查。
The system of selecting judges at the end of Qing Dynasty went through the process from selecting based upon experience and longevity at random to selecting based upon examination.
清末法官选拔制度经历了以资历和经验为标准的随机选拔到以考试选拔法官的过程。
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