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1. Three-dimensional buildings are often in complex natural scenes, especially in urban areas, in most cases they are associated with their neighboring buildings. As a result of variability of flight route and inertial navigation, leading to identify three-dimensional buildings in urban areas is a challenging task.
2. In general, the above methods are all belong to the class of direct recognition, having no place the building into the ¡°context¡± of natural scenes. When the feature of building is not notable compared with its neighboring scenes, such as long distance, bad lighting condition, too many similar patterns, it is not feasible to identify directly.
3. In fact, the idea of looking for object indirectly is much more accord with the mechanism of human visual navigation, that is to say, when we attempt to capture a target, if the feature of the target is not obvious, we usually capture the landmark structure firstly, which is in the neighboring area of the target and has obvious feature, then identify the target indirectly.

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[ Last edited by ilove_muchong on 2009-11-14 at 14:15 ]

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1, three-dimensional structures often in complex natural scenes, especially those in urban areas, most of the time associated with its surrounding buildings into one. As the flight route, as well as the variability of the inertial navigation error, resulting in urban areas to identify three-dimensional structures is a challenging task.
2, generally speaking, the above-mentioned methods are a direct recognition of the scope, there is no building to put a natural setting of the "context" which, when compared with the characteristics of the surrounding buildings in the scene is not very clear, for example, distance, light well, more repetitive pattern, in this case, the direct recognition is not feasible.
3, in fact, indirectly, to find targets more consistent with human visual navigation mechanism, that is, when we intended to find a target time, if the characteristics of the target is not very clear, we usually around the first capture of the building has obvious characteristics of features in the structure, and then indirect recognition of our goals.
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