發(fā)布時間：2018-06-04 15:28

  本文選題：紋理映射 + 三維重建　； 參考：《測繪科學(xué)》2017年01期

【摘要】：針對多視影像重疊度高、影像來源豐富等特點,提出了一種基于多視角影像的紋理擇優(yōu)映射算法,該方法對模型三角形進(jìn)行逐個相機(jī)場景可見性分析,對模型在場景中不可見三角形和部分可見三角形進(jìn)行選擇性剔除,只對完全可見三角形及符合閾值計算的部分可見三角形提供候選紋理三角形,能有效解決模型不可見三角形和部分可見三角形被誤貼紋理的問題,再通過對候選紋理三角形的視角分析,為幾何模型表面三角形選擇一個理論最優(yōu)紋理,計算映射關(guān)系自動映射到模型表面。同時,本文將該紋理擇優(yōu)映射算法應(yīng)用到基于近景影像的三維重建中,使用從運動中恢復(fù)結(jié)構(gòu)SFM的方法進(jìn)行相機(jī)標(biāo)定及影像相對定向,通過CMVS/PMVS密集匹配方法從影像中獲取點云模型,采用Possion算法重構(gòu)模型三角網(wǎng),最終利用提出的紋理擇優(yōu)算法確定最佳紋理并實現(xiàn)自動映射。通過與Smart3d、PhotoScan、lensphoto軟件的對比證明了本文三維重建及紋理擇優(yōu)算法在近景影像三維重建中的有效性。
[Abstract]:In view of the characteristics of high overlap and abundant sources of multi-view images, a texture optimal mapping algorithm based on multi-view images is proposed, which analyzes the visibility of model triangles on camera scenes. The model is selectively removed from invisible triangles and partially visible triangles in the scene, and only candidate texture triangles are provided for fully visible triangles and partially visible triangles that conform to the threshold calculation. It can effectively solve the problem of invisible triangles and partially visible triangles being misaffixed to textures, and then through analyzing the angle of view of candidate texture triangles, we can select a theoretical optimal texture for geometric model surface triangles. The mapping relation is automatically mapped to the surface of the model. At the same time, the texture optimal mapping algorithm is applied to 3D reconstruction based on close-range image, and the method of recovering structure SFM from motion is used for camera calibration and image orientation. The point cloud model is obtained from the image by CMVS/PMVS dense matching method, and the model triangulation is reconstructed by using the Possion algorithm. Finally, the proposed texture selection algorithm is used to determine the best texture and realize the automatic mapping. The comparison with Smart3dX PhotoScanlen-sphoto software proves the effectiveness of the proposed 3D reconstruction algorithm and texture selection algorithm in the 3D reconstruction of close-range images.
【作者單位】： 長沙市規(guī)劃信息服務(wù)中心;中南大學(xué)地球科學(xué)與信息物理學(xué)院;
【基金】：國家“973”計劃資助項目(2012CB719904)
【分類號】：TP391.41
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本文編號：1977881