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MVS-Pheno:A Portable and Low-Cost Phenotyping Platform for Maize Shoots Using Multiview Stereo 3D Reconstruction

Plant Phenomics 2020年第1期2卷 40-56页

作者： Sheng Wu weiliang wen Yongjian Wang Jiangchuan Fan Chuanyu Wang wenbo Gou Xinyu Guo Beijing Research Center for Information Technology in Agriculture Beijing 100097China National Engineering Research Center for Information Technology in Agriculture Beijing 100097China Beijing Key Lab of Digital Plant Beijing 100097China

Plant phenotyping technologies play important roles in plant research and agriculture.Detailed phenotypes of individual plants can guide the optimization of shoot architecture for plant breeding and are useful to analyze the morphological differences in response to environments for crop cultivation.Accordingly,high-throughput phenotyping technologies for individual plants grown in field conditions are urgently needed,and MVS-Pheno,a portable and low-cost phenotyping platform for individual plants,was developed.The platform is composed of four major components:a semiautomatic multiview stereo(MVS)image acquisition device,a data acquisition console,data processing and phenotype extraction software for maize shoots,and a data management system.The platform’s device is detachable and adjustable according to the size of the target shoot.Image sequences for each maize shoot can be captured within 60-120 seconds,yielding 3D point clouds of shoots are reconstructed using MVS-based commercial software,and the phenotypic traits at the organ and individual plant levels are then extracted by the software.The correlation coefficient(R^(2))between the extracted and manually measured plant height,leaf width,and leaf area values are 0.99,0.87,and 0.93,respectively.A data management system has also been developed to store and manage the acquired raw data,reconstructed point clouds,agronomic information,and resulting phenotypic traits.The platform offers an optional solution for high-throughput phenotyping of field-grown plants,which is especially useful for large populations or experiments across many different ecological regions.

关键词： breeding Stereo yielding

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An interactive design method for realistic fruit rot modeling and simulation

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International Journal of Modeling, Simulation, and Scientific Computing 2018年第5期9卷 45-58页

作者： Sheng Wu Boxiang Xiao Teng Miao weiliang wen Xinyu Guo Beijing Research Center for Information Technology in Agriculture Beijing 100097 P.R.China Beijing Academy of Agriculture and Forestry Science Beijing 100097 P.R.China Beijing Key Lab of Digital Plant Beijing 100097 P.R.China

This paper presents a general 3D method to simulate a rotting process in fruits using a visual model for the digital design of the fruits.The global rot parameter and rot resistance parameter are used to control a dynamic simulation of a rotting process.The rot resistance parameters of every point of a 3D fruit model are generated by an interactive designing method that is similar to the traditional sketch drawing tools.We construct a texture of a rot region on a fruit surface by resistance parameters.The degree of rot that is used to control both shape and appearance of rotten fruit surface can be computed by tuning the resistance parameters and global rot parameters.We derive an exponential function to calculate the depression displacement of geometric shape caused by the rot.In order to render a wrinkle on the rot region,we use a normal noise map to modify a normal vector of fruit model and use an isotropic ward BRDF model to represent an appearance of fruit in which the time-varying diffuse reflectance is derived from the real photos.We utilize a linear function to control the dynamic simulation processes including shape deformation and aging appearance.We have evaluated our method by simulating the rotten apple and moldy orange.The results have shown that our method provides a dynamic,real-time and realistic simulation,and it is flexible,fast and of a general character for digital fruit design as a visualization model.

关键词： Digital design fruit rot rot deformation BRDF.

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Influence of temperature and light gradient on leaf arrangement and geometry in cucumber canopies: Structural phenotyping analysis and modelling

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Information Processing in Agriculture 2019年第2期6卷 224-232页

作者： Tingting Qian Xiuguo Zheng Xinyu Guo weiliang wen Juan Yang Shenglian Lu Shanghai Academy of Agriculture Sciences Shanghai 201403China College of Computer Science and Information Technology Guangxi Normal UniversityGuilin 541004China Beijing Key Lab of Digital Plant Beijing 100097China Shanghai Technology Engineering Research Center for Digital Agriculture Shanghai 201403China

Accurate structural phenotyping analysis is essential to understand plant architectural adaptation strategy to environment change.The aim of this study was to analyze leaf arrangement and geometry influenced by azimuthally generated light gradient;and to simulate static and heterogeneous cucumber canopies using regression equations by considering more geometric parameters.Three continuous measurements of structural organ parameters were obtained to fit the organ initiation and expansion curves.Four measurements with three density treatments were obtained to validate model accuracy.To describe leaf distribution and orientation characteristics in more detail,azimuth and elevation models were introduced into canopy structure modelling.Leaf distribution frequency was simulated based on leaf area index and solar elevation angle while leaf elevation was simulated based on leaf azimuth and acropetal phytomer number.This study provides an important basis for structural phenotyping analysis of cucumber canopy,which is essential for more accurate functional-structural modelling in the future.

关键词： Phenotyping Structure Heterogeneity Model calibration Azimuth Elevation

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An Algorithm for Segmenting Spots in Crop Leaf Disease Image with Complicated Background

An Algorithm for Segmenting Spots in Crop Leaf Disease Image...

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作者： Zhihua Diao Xinyu Guo Chunjiang Zhao Shenglian Lu weiliang wen National Engineering Research Center for Information Technology in Agriculture Department of Automation University of Science and Technology of China

A segmentation algorithm is proposed in this paper to deal with the problem of segmenting spots from crop leaf disease image with complicated background.Firstly the profile of the initial image is extracted by using a watershed algorithm from the gray-scale image,and the binary image is obtained by combining a threshold processing and morphological operations.Then the accurate leaf disease image is extracted by using window clipping and image restoration.Finally,the spots are segmented from the leaf disease image by using green segmentation algorithm,and the accurate spot information can be obtained after noise reduction.The experimental result shows that the proposed algorithm can be used in complicated field environment with high extracting accuracy.

关键词： Image Segmenting Watershed Algorithm Morphological Processing Noise Elimination Complicated Background

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Evaluating the Effect of Multiple Scattering on Interception of Photosynthetically Active Radiation at Organ Scale Within Maize Canopy

Evaluating the Effect of Multiple Scattering on Interception...

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作者： Jun Meng Xinyu Guo Xiaohong Du weiliang wen Shenglian Lu Boxiang Xiao China National Engineering Research Center for Information Technology in Agriculture(NERCITA) Life Science Department of Luoyang Normal University

Multiple scattering is a critical factor that affects the spatial distribution of photosynthetically active radiation(PAR) within the canopy.But it is neglected sometimes to reduce the numerical complexity in plant functioning simulation with no adequate assessment.In this study,using VisuAlea visual programming tool and Caribu module which based on the nested radiosity method,PAR interception at organ scale is analyzed on the basis of 3-dimentional architecture model of maize canopy which consists of 50 plants.Combining with photosynthesis model,the importance of multiple scattering to canopy PAR distribution is evaluated.The result shows that,the multiple scattering take notable effect on PAR intensity on leaf surface(|t|> t),especially the lower surface,and lead to a 19.88%enhancement of absorbed energy.Due to the high light usage ratio when PAR far below the saturation point,leaves under multiple scattering conditions show an average of 7.48 μmol CO · m· sphotosynthesis rate,23.43%more than control’s 6.06 μmol CO·m·s.Although leaves in the lower layers of the canopy can not receive as much scattering as those in the upper layers,their resultant photosynthesis promotion almost equal.As a conclusion,the multiple scattering affect spatial distribution of PAR within the canopy significantly,and the multiple scattering process should be considered with special attention in crop growth simulation,especially in agronomical view.

关键词： The Nested Radiosity Model Multiple Scattering Spatial Distribution Canopy Photosynthetically Active Radiation

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An Interactive Digital Design System for Corn Modeling

An Interactive Digital Design System for Corn Modeling

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亚洲精细农业与计算机农业应用联合大会

作者： Boxiang Xiao Xinyu Guo Xiaohong Du weiliang wen Xue Wang Shenglian Lu 1 China National Engineering Research Center for Information Technology in Agriculture Beijing China Beijing P. R. China

An interactive digital design system for corn modeling is presented in this paper. The system designed and developed based on growth model of corn, thus the digital design for corn is suitable for biological and physiological characteristics according to the natural growth process of corn. The framework is supported by agricultural knowledge model in steps: knowledge model, mathematical model, geometric model and display model. Specially, a template-based method is implemented for leaf modeling. The system is composed of several key function modules: computer graphic design, template, geometric modeling, database support, data processing and graphic user interface, and developed by C++ program language based on OpenGL graphic library. Main functions of this system includes plant type design, organs of corn model design, plant model design, corn colony design, display of colony and calculation of light distribution in plant canopy layer. As an interactive digital design tool for corn modeling, the system provides a convenient way for rapid three-dimensional data acquisition and construction.

关键词： Interactive Digital Design System Corn Modeling

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Postprocessing techniques of CT colonography in detection of colorectal carcinoma

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World Journal of Gastroenterology 2004年第11期10卷 1574-1577页

作者： Ming-YueLuo HongShan Li-QingYao Kang-RongZhou wen-weiliang DepartmentofRadiology theThirdAffiliatedHospitalSunYat-SenUniversityGuangzhou510630GuangdongProvinceChina EndoscopyCenter ZhongshanHospitalFudanUniversityMedicalSchoolShanghai200032China DepartmentofRadiology ZhongshanHospitalFudanUniversityMedicalSchoolShanghai200032China

AIM: To evaluate the value of postprocessing techniques of CT colonography, including multiplanar reformation (MPR), virtual colonoscopy (VC), shaded surface display (SSD) and Raysum, in detection of colorectal carcinomas. METHODS: Sixty-four patients with colorectal carcinoma underwent volume scanning with spiral CT. MPR, VC, SSD and Raysum images were obtained by using four kinds of postprocessing techniques in workstation. The results were comparatively analyzed according to circumferential extent, lesion length and pathology pattern of colorectal carcinomas. All diagnoses were proved pathologically and surgically. RESULTS: The accuracy of circumferential extent of colorectal carcinoma determined by MPR, VC, SSD and Raysum was 100.0%, 82.8%, 79.7% and 79.7%, respectively. There was a significant statistical difference between MPR and VC. The consistent rate of lesion length was 89.1%, 76.6%, 95.3% and 100.0%, respectively. There was a statistical difference between VC and SSD. The accuracy of discriminating pathology pattern was 81.3%, 92.2%, 71.9% and 71.9%, respectively. There was a statistical difference between VC and SSD. MPR could determine accurately the circumference of colorectal carcinoma, Raysum could determine the length of lesion more precisely than SSD, VC was helpful in discriminating pathology patterns. CONCLUSION: MPR, VC, SSD and Raysum have advantage and disadvantage in detection of colorectal carcinoma, use of these methods in combination can disclose the lesion more accurately.

关键词：后加工技术 CT诊断结直肠癌肿瘤病理学

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Capability of multidetector CT to diagnose hepatocellular carcinoma-associated arterioportal shunt

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World Journal of Gastroenterology 2005年第17期11卷 2666-2669页

作者： Ming-YueLuo HongShan Zai-BoJiang wen-weiliang Jian-ShengZhang Lu-FangLi DepartmentofRadiology TheThirdAffiliatedHospitalSunYat-SenUniversityGuangzhou510630GuangdongProvinceChina

AIM: To investigate the capability of multidetector CT (MDCT) to diagnose HCC-associated arterioportal shunt (APS).METHODS: Two hundred and eighty-two patients with HCC received both thin-slice and enhancement MDCT scanning at early hepatic arterial phase, late hepatic arterial phase and portal venous phase, and digital subtract angiography (DSA) examination. Images were analyzed jointly by two experienced radiologists blinded to the opposite examination results, including the existence or not of APS, shunt locations, types and degrees of APS, with or without thrombosis. RESULTS: There were 56 APS associated with HCC, including 48 central, seven peripheral and one mixed, or 42 severe, seven moderate, seven mild APS. Fortyone severe, seven moderate and central APS were all revealed with MDCT and DSA. Seven mild and peripheral APS were all displayed with MDCT; only five of them displayed DSA, two faint shunt APS associated with massive HCC were missed. One mixed APS was demonstrated as severe combined with mild shunt with both MDCT and DSA.CONCLUSION: MDCT could diagnose not only DSA revealed APS, but also missed mild and peripheral APS with DSA due to faint shunt associated with massive HCC, is a simple, effective and noninvasive new technique for diagnosis of HCC-associated APS.

关键词： CT诊断技术性能肝细胞癌血管疾病并发症

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自适应加权算子结合主曲线提取玉米叶片点云骨架

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农业工程学报 2022年第2期38卷 166-174页

作者：胡建平刘凯郭新宇吴升温维亮东北电力大学理学院吉林132012 北京市农林科学院信息技术研究中心北京100097 国家农业信息化工程技术研究中心北京100097 数字植物北京市重点实验室北京100097

为从玉米叶片点云数据(尤其是缺失点云数据)中准确提取骨架特征,该研究设计了一种考虑玉米叶片形状结构和数据完整性的自适应加权算子来计算玉米叶片点云的骨架约束点集,并引入主曲线对骨架约束点集进行拟合得到优化的玉米叶片点云骨架... 详细信息

为从玉米叶片点云数据(尤其是缺失点云数据)中准确提取骨架特征,该研究设计了一种考虑玉米叶片形状结构和数据完整性的自适应加权算子来计算玉米叶片点云的骨架约束点集,并引入主曲线对骨架约束点集进行拟合得到优化的玉米叶片点云骨架。首先使用K均值聚类将玉米叶片分为若干变化较为平缓的部分;然后通过改进的距离场方法提取点云的截面相关点集;再利用设计的包括空间距离、法向差异和点云完整性的自适应加权算子,提取骨架约束点集;最后计算骨架约束点集的主曲线得到最终的玉米叶片点云骨架。通过对30个具有典型形状特征的玉米叶片点云数据的测试结果表明,本文方法所提取的骨架能较好地反映玉米叶片的三维形状结构,利用所提取骨架计算的叶长与实测叶长的平均绝对百分比误差(Mean Absolute Percent Error,MAPE)为2.10%,均方根误差(Root Mean Square Error,RMSE)为2.21 cm,标准化均方根误差(Normalized Root Mean Square Error,NRMSE)为2.89%。该方法可实现玉米叶片点云骨架的自动提取,对缺失的点云数据具有较好的鲁棒性,无需后期手动调整,能够为表型大数据处理、自动化表型解析等提供技术支持。

关键词：三维植物提取玉米叶片骨架主曲线自适应加权算子

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Myocardial infarction secondary prevention study (MISPS)

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Journal of Geriatric Cardiology 2006年第2期3卷 116-119页

作者： Hongcai SHANG Guohua DAI Junhua HANG Yaozu XIANG Yang WANG Junping ZHANG Wuxun DU Jingyuan MAO Chen YAO weiliang wenG Tiancai wen Boli ZHANG Tianjin University of Traditional Chinese Medicine Tianjin 300193 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China First Hospital of Peking University Beijing 100700 China Chinese Academy of Traditonal Chinese Medicine Beijing 100700 China Chinese Academy of Traditonal Chinese Medicine Beijing 100700 China Tianjin University of Traditional Chinese Medicine Tianjin 300193 China

Background Traditional Chinese medicine (TCM), especially herbal medicine, has been widely used in China and now is also being increasingly used in other countries for the treatment of cardiovascular diseases. Although many studies have demonstrated that certain Chinese herbal products are effective and safe for the treatment of cardiovascular diseases, most of these lack sufficient quality. Therefore, large randomized clinical trials and further scientific research to determine its safety, effectiveness are necessary.QiShen YiQi Dripping Pills (QSYQDP) is a herbal preparation clinically used in the treatment and prevention of coronary artery disease. Preliminary observations have shown its safety and effectiveness. Methods/Design This randomized, controlled trial will recruit 3600 patients with a history of myocardial infarction. Patients will be randomized into two groups by a Centr-Randomized System. One group receives QSYQDP, the other group receive aspirin. This trial protocol will describe eligibility criteria, detailed information on the treatment definition, blinding, endpoints, statistical methods, sample size determination, data management, legal aspects, and the current status of the trial. Discussion This trial is one of the first randomized, controlled clinical trial to evaluate the efficacy and safety of traditional Chinese herbal medicine in the treatment and secondary prevention of coronary artery disease. The results of this study should help to define the role of TCM in modern medical care, as well as to provide the management strategy for CAD patients in China and other countries.

关键词： Myocardial infarction secondary prevention study MISPS MACE

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