基于手持式三维扫描仪的种子快速建模与试验

Rapid seed modeling and experiment based on handheld 3D scanner

种子外观形态与建模研究是很多研究课题中重要的组成部分。种子颗粒较小,常规扫描建模无法对种子背面扫描建模,现有方法大都采用二次扫描进行缝合拼接,建模过程复杂、建模效率低且拼接操作易引入误差。为解决上述问题,搭建一种基于手持式激光扫描仪的种子三维全貌特征测绘平台,提出了种子快速建模方法,可实现一次性快速测得种子外形全貌特征,无须进行模型拼接等操作,降低了建模难度,提升了建模效率。对茶籽、花生、莲子三种类型的种子进行了建模试验和分析,结果表明:茶籽最大差值为0.07 mm,最大相对误差为0.38%;花生的最大差值为0.05 mm,最大相对误差为0.15%;莲子的最大差值为0.04 mm,相对误差为0.27%;相对误差均低于0.5%,说明该方法具备较高的建模精度。

Seed appearance morphology and modeling is an important part of many research topics.Because the seed particles are small,conventional scanning modeling cannot model the seed backside.Most of the existing methods adopt secondary scanning for stitching,which leads to complex modeling process,low modeling efficiency and introduction of errors in stitching.In order to solve the above problems,we built a mapping platform for constructing the seed threedimensional full feature based on the handheld laser scanner and proposed a rapid seed modeling method,which can realize one-time rapid measurement of the full feature of the seed shape without the need for model splicing and other operation.This can reduce the difficulty of modeling and improving the efficiency of modeling.The modeling test and analysis of tea seed,peanut and lotus seed were carried out.Results showed that the maximum difference of tea seed was 0.07 mm and the maximum relative error was 0.38%.The maximum difference of peanut was 0.05 mm and the maximum relative error was 0.15%.The maximum difference of lotus seed was 0.04 mm and the relative error was 0.27%.The relative errors are all lower than 0.5%,indicating that the method has high modeling accuracy.