基于Ray Tracing的数字植株冠层光照分布研究

针对植株冠层光照模型精度不高、采集效率低的问题,提出了一种基于Ray Tracing的数字植株冠层光照分布计算方法。首先,通过Kinect 2.0获取两种盆栽植株的三维点云,对其进行预处理和三维重建;其次,通过改进的光线跟踪技术模拟植株冠层光照分布;然后,分析了不同时刻模拟植株累计光强与真实植株实际光照强度之间的关系。实验结果表明:两种植株的模拟光强与真实光强的RMSE分别为0.187 2和0.118 5,因此该方法具有实时性和可行性,可以为植株提供较为科学合理的整形和修剪参考。

Research of Illumination Distribution of Digital Plant Canopy Based on Ray Tracing

For the problem of low accuracy and effectiveness of existed illumination model of plant canopy,this paper proposed a method to calculate light distribution on digital plant canopy based on Ray tracing. First,3 D point cloud of potted plants were obtained by Kinect 2. 0 and reconstructed into 3 D meshes. Secondly,an improved Ray tracing was applied on plant meshes to simulate light distribution. And then,the relationship between simulated accumulated light intensity of digital plants and real illumination intensity was analyzed. Experiments show that the proposed method of illumination model based on Ray tracing has good feasibility and real time performance. And RMSE of simulated and real illumination intensity of two potted plants are 0. 1872 and 0. 1185 respectively. Therefore,this method can supply reasonable and scientific suggestions for branch trim of plants.