摘要： 虚拟植物技术对作物产量预测、土地生产力评价、资源环境分析、作物栽培指导、作物生长机理研究以及调控作物生长发育及其对环境的反应研究都有着十分重要的意义。目前虚拟植物普遍使用的玉米叶脉曲线拟合曲线函数在叶尖坐标Y不是最大坐标的时候，不能很好地描述叶曲线。该文以玉米叶子的中脉为轴线，贴合玉米叶子的平面纹理图像。将玉米叶子中脉表达成3次B样条曲线，实施空间变形，再将纹理图像嵌入到变形后玉米叶脉曲线的局部标架中。该方法在叶尖坐标是否最大坐标时都适用，直接进行曲线拟合，而不必进行叶片角度旋转，绘制出的玉米叶子具有叶子的脉络细节，真实感较强。

关键词: 虚拟植物, 分形, 纹理图像, B样条曲线

Abstract: Virtual plant technique is significant to crop yield, land productivity evaluation, resources environment analysis, crop cultivation instruction, crop growth mechanism research and control over crop growth and its reaction to the environment. This paper takes the midrib of maize leaf as axis and joins plane texture image of maize leaf, expresses the midrib of maize leaf as B-splines, carries out space transform, and embeds the texture image into transformed midrib curve of maize leaf. The method can be applied to all coordinates of the apex of leaf, where curve fitting can be carried out directly without leaf angle circumgyration, which yields maize leaves as real as they are.

Key words: virtual plant, fractal, texture image, B-splines

中图分类号: 

• TP37