从单幅图像构建三维叶雕模型

3D Leaf Carving Construction from Single Leaf Carving Image

针对传统镂空叶雕具有手工制作烦琐且不便传承的缺点,提出一种由单幅叶雕图像生成叶雕三维模型的辅助设计方法.首先将叶雕图像划分为镂空区域、无用区域和有用区域,根据用户选择遍历像素提取细长叶柄;然后通过距离图像生成初始三维模型并用S型函数进行高度调整;再利用灰度形态学处理方法获取叶脉图像叠加在模型上进行叶脉构建,采用保留特征的光滑算法光滑整个模型;最后以扩散流形式提取狭长区域骨架点,并进行接续,延伸,三角结构重构处理避免凹陷现象,利用模型上约束关系获取边缘点,重置边缘点、狭长区域骨架点以及叶柄骨架点高度调整模型,通过新点插入法处理缺断得到最终模型.实验结果表明,该方法能得到效果良好的叶雕三维模型.

Traditional leaf carving requires complicated handwork, which is not easily inherited to the next generation. In this paper, we present a method to construct 3D leaf carving from single image. Firstly, we divide the image into three parts, the hollow part, the useless part and the useful part. Then, according to user＇s selection, the slender petiole is extracted by traversing pixels. After that, we transform the image into distance field, construct the initial 3D model, and refine it using sigmoid function. Gray scale morphology method is employed to extract the leaf vein and add feature details. The 3D model is smoothed by feature preserving smooth algorithm. Finally, we obtain the skeleton points in narrow parts using the method similar to fluid diffusion and do a process of connecting, extending and triangle structure reconstruction to avoid dimple phenomena. Based on model constraints, we get boundary points. To adjust the 3D model, the heights of boundary points, skeleton points in narrow parts and petiole skeleton points are reconnected. The final model is generated by inserting points to repaire breaking parts. Experimental results show that the proposed method can generate good 3D leaf carving model.