基于激光同步扫描图像的三维景物纹理映射  

Texture mapping of 3D scenes based on the laser-synchronized visual image

作　　者：金鑫[1] 孙卫东[1] 

机构地区：[1]清华大学电子工程系图像图形研究所遥感研究室,北京100084

出　　处：《仪器仪表学报》2006年第z3期2083-2085,共3页Chinese Journal of Scientific Instrument

基　　金：教育部科学技术研究重点项目(No.03008);国家"863"高科技研究计划资助项目(2001AA131021)

摘　　要：本论文分析了目前三维景物纹理映射的主要技术方法和存在的问题。本文以清华大学自主研发的三维激光与可见光同步扫描系统TH-3DLCS-2001为平台,提出了基于激光同步扫描图像的三维景物模型纹理映射方法。传统纹理映射方法中相机参数无法准确获知,限制了纹理映射的准确性。对此,在本文提到的方法中首先对同步扫描图像和三维激光扫描数据进行配准,估计相机内外参数,然后利用激光同步扫描图像作为中介,采用两步法进行高分辨率图像与激光扫描数据的全局和局部误差估计,最后在高分辨率纹理映射过程中进行反向误差补偿。实验表明本文提出的纹理映射方法是可行的,并且能够显著提高纹理映射的精度。In this paper the existing techniques and methods for 3D texture mapping are analyzed , and the advantages and disadvantages for each category of technique are pointed out. Using the platform of TH-3DLCS-2001, a 3D laser-visual synchronized scanning system developed by Tsinghua University, a new technique for texture mapping of 3D scene based on synchronized visual image and laser scanning data is proposed. In the existing texture mapping methods, the camera parameters can't be acquired accurately, which would limits the accuracy of texture mapping. In this new method, laser data and synchronized visual image are calibrated at first. Second, the camera parameters are estimated. Then, utilizing the laser-synchronized visual image as one kind of intergradations, the global and local mapping error distributions between higher resolution texture image and laser scanning data are calculated using a two-step method. Finally, using the calculated error distributions, the higher resolution textures are mapped to the 3D model. Experiment results show that this method is feasible and the accuracy of texture mapping is improved evidently.

关 键 词：三维重建 纹理映射 相机校正 误差补偿 

分 类 号：TH7-55[机械工程—仪器科学与技术]