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浙江大学学报(理学版)  2022, Vol. 49 Issue (1): 1-9    DOI: 10.3785/j.issn.1008-9497.2022.01.001
图形模拟与目标跟踪     
基于纹理特征的小麦锈病动态模拟方法
杨猛1,2(),丁曙1,2,马云涛1,2,谢佳翊1,2,段瑞枫1,2
1.北京林业大学 信息学院,北京 100083
2.国家林业草原林业智能信息处理工程技术研究中心,北京 100083
Dynamic simulation method of wheat rust based on texture feature
Meng YANG1,2(),Shu DING1,2,Yuntao MA1,2,Jiayi XIE1,2,Ruifeng DUAN1,2
1.School of Information Science and Technology of Beijing Forestry University,Beijing 100083,China
2.Engineering Research Center for Forestry-Oriented Intelligent Information Processing of National Forestry and Grassland Administration,Beijing 100083,China
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摘要:

病害仿真是农业信息化的重要研究内容之一,通过模拟病害发生过程,可方便直观有效地宣传作物病害有关知识。病害模拟在教学、影视及游戏等领域也有重大应用价值。为实现作物病害过程模拟,以小麦为研究对象,在温度与湿度变化环境下,对小麦条锈病、叶锈病、秆锈病3种锈病类型进行基于纹理特征的动态仿真模拟。用噪声模拟分布在小麦茎叶上的孢子堆,通过调整噪声属性模拟不同的锈病类型,从而达到逼真的模拟效果;通过改变遮罩贴图中红绿蓝(RGB)3种颜色分量的分布,指定模拟发病位置,区分小麦锈病的发病类型;通过着色器调整指定位置作物模型表面贴图,以径向为扩散路径,完成植株从完好到完全发病的可视化过程。该方法模拟效果较好,具有一定的研究意义与应用价值,可为其他作物的多病害模拟提供参考。

关键词: 纹理特征锈病Simplex噪声着色器    
Abstract:

Simulation of plant disease is an important part of agricultural informatization. It can more intuitively and effectively disseminate knowledge of crop diseases and popularize the process of disease occurrence. In addition, disease simulation has great application values in the fields of teaching, film and games, etc. In order to simulate the process of crop diseases, this article takes wheat as the main research object. Considering the two environmental conditions of temperature and humidity, the three rust types of wheat stripe rust, leaf rust and stem rust are simulated based on textures feature. A noise function is used to simulate a distribution of spores on the wheat stems and leaves, and these noise properties can be adjusted according to the type of rust to achieve a more realistic simulation effect. The position of disease on the surface of plant can be simulated by changing the distribution of three-color components of RGB on a mask map. We adjust the surface map of a crop model into a specified position with a shader and then take a spherical shape whose radius is gradually increasing to specify the range of infected area. Finally we simulate a visualization of the whole spread process of a plant from intact to complete disease. Experimental results show that the simulation algorithm proposed in this paper is effective with realistic results and of good universality. The ideas of this simulation algorithm can provide a reference for various disease simulations of other kinds of plants.

Key words: texture feature    rust disease    Simplex noise    shader
收稿日期: 2021-06-11 出版日期: 2022-01-18
CLC:  TP 391.41  
基金资助: 国家重点研发计划项目(2019YFC1521104);国家自然科学基金资助项目(61402038);北京市社会科学基金项目(17YTC030);中央高校基本科研业务费专项(2015ZCQ-XX)
作者简介: 杨猛(1982—),ORCID:https://orcid.org/0000-0001-6439-2873,男,博士,副教授,主要从事植物模拟、虚拟园林植物建模、植物可视化等研究,E-mail:yangmeng@bjfu.edu.cn.
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引用本文:

杨猛,丁曙,马云涛,谢佳翊,段瑞枫. 基于纹理特征的小麦锈病动态模拟方法[J]. 浙江大学学报(理学版), 2022, 49(1): 1-9.

Meng YANG,Shu DING,Yuntao MA,Jiayi XIE,Ruifeng DUAN. Dynamic simulation method of wheat rust based on texture feature. Journal of Zhejiang University (Science Edition), 2022, 49(1): 1-9.

链接本文:

https://www.zjujournals.com/sci/CN/10.3785/j.issn.1008-9497.2022.01.001        https://www.zjujournals.com/sci/CN/Y2022/V49/I1/1

图1  总体结构示意
类型危害区域锈孢子期→夏孢子期夏孢子期→冬孢子期
条锈病叶片鲜黄色夏孢子堆,小长条、虚线状长条,产生黑褐色冬孢子堆
叶锈病叶片橘红色夏孢子堆,圆形散生、排列不规则连接成病斑,产生近圆形黑色冬孢子堆
秆锈病茎秆褐黄色夏孢子堆,散生、排列不规则连接成病斑,出现黑色冬孢子堆
表1  小麦锈病表观纹理特征
图2  贴图类型
图3  噪声结果示意
小麦锈病类型S1S2
条锈病2.70.5
叶锈病5.00.7
秆锈病2.01.0
表2  3种小麦锈病的噪声参数值
图4  算法流程
图5  扩散范围示意
图6  3种小麦锈病模拟效果比较
图7  锈病染病过程
类型

很相似/

%

相似/

%

一般/

%

不相似/

%

很不相似/

%

条锈病26.9652.1719.130.870.87
叶锈病5.2251.338.263.481.74
秆锈病5.2228.754.787.833.48
表3  模拟效果用户反馈
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