Abstract:

Aiming at the problem of three-dimensional visualization of wheat leaves which is difficult to realize, the three-dimensional reconstruction of wheat leaves was carried out by NURBS surface algorithm. Specific data such as wheat leaf length, leaf width, stem and leaf angle, leaf sheath length, and leaf sheath diameter were measured. The main vein control point information of the leaves and leaf sheaths was calculated using the main vein control point algorithm. All the control point information was calculated based on leaf width, leaf sheath diameter, and other information. The three-dimensional model of wheat leaves was constructed using OpenGL in visual studio. The wheat leaf model obtained by the research algorithm has a high similarity with real wheat leaves, which better reflects the curvature of the leaves and truly reflects the morphological information of crop leaves. The three-dimensional reconstruction based on NURBS surface has flexible control, convenient use, and simple calculation, which has good application and reference value in the three-dimensional modeling of crops.

Key words: NURBS surface algorithm, wheat leaf, measured data, control points, node vector, three-dimensional reconstruction, OpenGL, morphological characteristics