【摘要】 介绍一个工作在微波暗室内的Ｘ波段超分辨合成阵列成象实验系统。该系统发射宽带线性调频信号，采用时间带宽转换技术获得高的距离分辨力。其接收天线可在直线导轨上移动，形成大孔径合成阵列天线，获得高的横向分辨力。实时采集的数据在ＰＣ机上进行处理后给出目标的二维雷达象。超分辨方法使成象分辨力比传统方法提高２倍以上。更多还原

【Abstract】 A new method for threshold selection of the scanning image of a map is presented. It is based on the zero crossing of the wavelet transform which provides a multiscale analysis for the information of the histogram of an image.The method utilizes the gray level information and edge information within the neighborhood, and focus on the analysis to the details of the histogram so as to select accurate threshold progressively. Experimental results show that the presented approach is more reliable and capable of adaptability than the maximum entropy approach.更多还原