基于叶绿素相对值的植物叶片颜色模拟方法  

Simulation of Plant Leaf Color Based on Relative Content of Chlorophyll

作　　者：苗腾[1] 赵春江[1] 郭新宇[1] 陆声链[1] 温维亮[1] 

机构地区：[1]北京农业信息技术研究中心,北京100097

出　　处：《农业机械学报》2014年第8期282-287,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家高技术研究发展计划(863计划)资助项目(2013AA102305);'十二五'国家科技支撑计划资助项目(2012BAD35B01);北京市农林科学院自主创新专项(KJCX201104011)

摘　　要：提出了一种基于叶绿素相对值(SPAD)的植物叶色模拟方法。首先利用自制的叶色数据采集装置,在外部环境恒定的条件下采集叶色数据,跟踪监测叶片不同生理时期的叶色变化。再基于数据对叶色进行分析,构建SPAD值与特定光环境下叶片颜色值的关系函数,并利用该函数推导出叶片的漫反射计算公式;最后采用基于SPAD纹理的方法对叶片表面的颜色差异以及随着时间发生的老化现象进行模拟。结果显示在确定的恒定外部环境下,SPAD值与叶片漫反射红绿蓝三通道关系函数呈指数关系,决定系数分别为0.972、0.968、0.509,表明SPAD与叶片漫反射颜色之间存在相关性,因此可利用SPAD作为驱动因子进行叶色仿真。同时,从视觉角度加以分析,基于SPAD的叶色模拟结果与真实图像对比,叶色的变化趋势一致,结果较真实。A method to simulate the leaf color based on SPAD data was presented. Firstly, the color data in different physiological ages of green dill leaves were tracked and detected using a self-made device for capturing leaf images, which could maintain the stability of the external environment （such as light, camera position）. Then, the leaf color attributes were analysed based on the data collected and a function representing the relationship between SPAD and leaf color was constructed to deduce the diffuse reflection formula of the leaf. Finally, a SPAD texture was used to simulate the time-and-space-varying reflectance of leaves aging. The experimental results showed that in the constant environment, the relationship between the SPAD and diffuse color of leaves could be represented by some exponential functions and the R2 was O. 972,0. 968,0. 509 respectively. This showed that there was a correlation between SPAD and leaf diffuse color, and it was reasonable using SPAD value as a driving factor to simulate the leaf aging. Meanwhile, compared with real photo, visual effects of proposed method could show the trend of leaf color aging realistically.

关 键 词：植物叶片 颜色模拟 SPAD值 数字植物 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]