基于单像视觉的平面透视影像度量纠正方法

A Method of Metric Rectification for Perspective Images of Planes Based on Monocular Vision

该文针对基于单幅影像的建筑物三维重建,提出一种对平面的透视影像进行度量纠正的方法。利用建筑物立面上的平行线作为约束条件,计算相应平面的透视影像上的灭点、灭线、投影中心及其他特征点线,以二维直接线性变换表达平面的透视影像与其平行影像间的变换关系,对建筑物立面影像进行纠正,通过纠正生成具有度量特性的平行影像。文章重点阐述了生成平行影像的原理和算法,同时也介绍了获取平行影像的长度比例的方法,并进行了算法的实现和实验,最后根据实验结果进行了误差分析。

Aiming at buildings' 3-D reconstructions based on a single view,this article proposes a method to perform metric rectification for perspective images of planes.Parallel lines in facades are used as constrains to determine the characteristic points and lines such as vanishing points,vanishing lines and the projection center in the correspoinding planes' perspective images.We use 2-D DLT(Direct Linear Transformation)to represent the transformation between the perspective image and the parallel image of a plane,and through rectification generate the parallel image that have metric properties.This article mainly addresses the theories and algorithm for the method of metric rectification,and also describes the methods to acquire the length ratio of the parallel images.Experiments and error analysis were made to testify the algorithm.