Aimedat studying the plane image detected by infrared imaging,this paper puts forward a method of adaptive threshold selection for the top-to-bottom gray image segmentation.This method combines the gray histogram analysis with the inherent and invariance features of the infrared gray plane image.The infrared plane image is divided into ten grades by the gained threcholds at all level and will be sent to the gray image recognition system as the data input.%以红外成像探测得到的飞机图象为研究对象，将灰度直方图分析和飞机红外灰度图象固有的不变性特性信息结合起来，提出了一种自顶向下的灰度图象分割自适应门限的选取方法。利用求得的各级门限对飞机红外图象进行灰度分级，得到具有10级灰度的飞机灰度图象，为灰度图象识别系统提供数据输入。
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