在某些情况下，如目标处于远距离、目标 局部对比度低、目标被遮挡、目标区模式频繁出现等，采用 直接识别方法难以正确识别目标。为此，提出了一种基 于平面地标间接定位的典型地面建筑物目标识别方法。在地面准 备阶段进行地标选取以及参考图制备。在飞行阶段，用匹配算法 对地标进行自动捕获、识别和定位，然后利用地标与目标的空间约束关系，间接 定位包含目标的局部感兴趣区。当局部感兴趣区的对比度显著 时，启动最后阶段的基于形态学处理框架的直接识别操作。通 过仿真实验测试分析了该算法的适应性。

In some cases, for instance, when a target is located at a long distance, when a target has low local contrast, when a target is obscured and when the pattern of a target zone occurs frequently, it is difficult for a direct recognition method to correctly recognize the target. For this reason, a recognition method for typical ground buildings based on indirect location of planar landmarks is proposed. At the ground preparation stage, the landmarks are selected and their reference images are prepared. At the flight stage, the landmarks are captured, recognized and located by a matching algorithm automatically. Then, the spatial constrains between the target and the landmarks are used to indirectly locate the local region of interest which contains the target. When the local region of interest has high contrast, the direct recognition based on morphological processing framework at final stage is started. The adaptability of the proposed algorithm is tested and analyzed in the simulation experiment.