亚洲一区欧美在线,日韩欧美视频免费观看,色戒的三场床戏分别是在几段,欧美日韩国产在线人成

The canopy leaf is an important part for the fruit tree development, and the spatial distribution and morphological structure of canopy plays a vital role in fruit yield and quality. The study on three-dimensional (3D) reconstruction of apple tree leaf blade can not only analyze the morphological characteristics, but also provide the theoretical basis for the calculation of canopy light distribution and pruning of fruit trees. With the rapid development of laser scanner technology, three-dimensional laser scanner is widely used in 3D reconstruction of different fields due to the advantages of non contact, high precision and high efficiency. A method was proposed for 3D reconstruction of apple tree leaf blade based on point cloud. And the accomplishment of the 3D reconstruction method was on the basic of presented point cloud simplification method. First of all, 3D laser scanner was used to obtain point cloud of apple tree leaf blade. Secondly, search the K-neighborhood points based on the bounding box method and calculate the average distance between the midpoint and its neighbors. The noises were identified according to distance threshold and then they were removed . Thirdly, extract the boundary feature points and retain them as a mandatory feature area. For the non-boundary points, according to the relationship between the midpoint normal vector and its neighbor normal vector, the points were reduced to different degrees. Finally, the 3D reconstruction of apple tree leaf blade is realized. The results showed that the constructed leaf model can preserve the 3D morphological features of the leaf, which can provide a basis for further canopy reconstruction and light distribution calculation.