中文摘要：

介绍了利用地面获取的单幅房屋近景影像计算房檐改正值的方法。该方法使用数码相机倾斜影像和房屋外观的几何约束条件，根据交比不变与透视旋转原理，确立了灭点、物方直线段与影像投影直线段之间的关系，并由此计算房檐宽度。实验结果表明，该方法能够满足实际需求。

英文摘要：

A method for computing the value of eave correction by using the single close range image of a building is introduced. In the method the digital lean image and the conditions of geometry and restriction of the framework appearance of building are used. According the cross ratio invariability and perspective reversion, the relation among the vanishing points, the spatial beelines and their projections in image is determined, and the width of the eave can be calculated. Experimental results show that it meets the requirements.