SPOT立体图像的有限元最小二乘匹配

DIGITAL MATCHING OF SPOT STEREO IMAGES BY FINITE ELEMENTS LEAST SQUARE TECHNIQUES

本文将多点最小二乘匹配算法扩展为有限元最小二乘匹配,导出了有限元最小二乘匹配的数学模型,并提出了自动产生视差格网的方案;通过试验研究了有限元最小二乘匹配中有关参数,例如,辐射变换参数、虚拟观测的权值以及视差格网间隔的确定。有限元最小二乘匹配算法无需预先进行核线重排列,就可以直接答解出有限个格网点的上下视差和左右视差。这种算法亦可用于其他任何投影方式成象的立体图象的自动匹配。

In this paper,a Finite Elements Matching by least Sguare Techniques (FEMALS) is developed based on the Multipoint Matching Method,and the mathematic model of FEMALS is given. Based on the FEMALS a scheme of automatic generating para Hax grid is presented. Determination of parameters of FEMALS,such as param eters of radiometric transformation,weights of fictitious observations and parallaxe grid space,are experimentaly studied. The FEMALS does not require preliminary resampling along epipolar lines,the x and y parallaxes of grid points connected by bilinear elements can be computed simullaneously from image data. This new method can also be used in Cases of other any projection from image data.