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Very High Density Point Clouds from UAV Laser Scanning for Automatic Tree Stem Detection and Direct Diameter Measurement

Karel Kuželka, Martin Slavík, Peter Surový
2020 Remote Sensing  
We segmented tree stems based on point densities in voxels in subcanopy space and applied three methods of robust circle fitting to fit cross-sections along the stems: (1) Hough transform; (2) random sample  ...  We detected correctly 99% and 100% of all trees in research plots for spruce and pine, respectively, and were able to estimate diameters for 99% of spruces and 98% of pines with mean bias error of −0.1  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/rs12081236 fatcat:345e2xfsvnah7fqvjx354o23d4

Individual Tree Detection in a Eucalyptus Plantation Using Unmanned Aerial Vehicle (UAV)-LiDAR

Juan Picos, Guillermo Bastos, Daniel Míguez, Laura Alonso, Julia Armesto
2020 Remote Sensing  
Results of the application of the local maxima filter to the canopy height model (CHM) intensely depends on the algorithm and the CHM pixel size.  ...  Two different procedures were applied on these points. One is based on creating a buffer around each single point and combining the overlapping resulting polygons.  ...  Conflicts of Interest: The authors declare no conflicts of interest. Remote Sens. 2020, 12, 885  ... 
doi:10.3390/rs12050885 fatcat:kfnry3jyfjhpdllae5tp3vevhi

Pashto Language Stemming Algorithm
English

Sebghatullah Aslamzai, Saidah Saad
2015 Asia-Pacific Journal of Information Technology and Multimedia  
Furthermore, the accuracy and strength of the proposed algorithm is evaluated using word count method.  ...  Therefore, the objective of the current thesis is to develop a rule-based stemming algorithm for the Pashto language.  ...  Furthermore, the accuracy and strength of the proposed algorithm is evaluated using word count method.  ... 
doi:10.17576/apjitm-2015-0401-03 fatcat:kulesubhtnhwlgedugjxepeciy

STEMBR: A Stemming Algorithm for the Brazilian Portuguese Language [chapter]

Reinaldo Viana Alvares, Ana Cristina Bicharra Garcia, Inhaúma Ferraz
2005 Lecture Notes in Computer Science  
This paper presents STEMBR, a stemmer for Brazilian Portuguese whereby the suffix treatment is based on a statistical study of the frequency of the last letter for words found in Brazilian web pages.  ...  The proposed stemmer is compared with another algorithm specifically developed for Portuguese. The results show the efficiency of our stemmer.  ...  The test results show that the STEMBR model is more efficient than the STEMP reference model in terms of under stemming errors, and less so with regard to over stemming errors.  ... 
doi:10.1007/11595014_67 fatcat:xmuuyqdz2feknnoidy3pk3tdnq

A Rule Based Stemmer

2019 International Journal of Engineering and Advanced Technology  
Various metrics have been used for evaluation.  ...  over stemming and under stemming errors.  ...  Brajendra et.al [7] studied the types of stemming errors available in both rule-based and statistical category.Ruba Rani et. al [8] provided a detailed evaluative report of the various stemming algorithms  ... 
doi:10.35940/ijeat.a9545.109119 fatcat:iawxjlybvjawrc23enzcnm357u

An Evaluation Method for Stemming Algorithms [chapter]

Chris D. Paice
1994 SIGIR '94  
This enables various indices of stemming performance and weight to be computed. Results are reported for three stemming algorithms.  ...  The effectiveness of stemming algorithms has usually been measured in terms of their effect on retrieval performance with test collections.  ...  I should like to thank Gareth Husk, Chris Danson and Helen Simpson for their invaluable work in cieveloping various parts of the software.  ... 
doi:10.1007/978-1-4471-2099-5_5 dblp:conf/sigir/Paice94 fatcat:ybbaentdujhfxaiqzxinjqllcm

Design and Development of Unsupervised Stemmer for Sindhi Language

Bharti Nathani, Nisheeth Joshi, G.N. Purohit
2020 Procedia Computer Science  
Results are compared with existing rule-based, stemmer [32] and Lemmatizer [33] , 1000 words are extracted from Sindhi Dictionary for evaluation.  ...  Results are compared with existing rule-based, stemmer [32] and Lemmatizer [33] , 1000 words are extracted from Sindhi Dictionary for evaluation.  ...  [42] Proposed a method in which the rule-based methods combine with HMM to increase the quality of Stemming.  ... 
doi:10.1016/j.procs.2020.03.212 fatcat:bs2mggcwh5bz3oeha25lehmu7u

Visualizing stemming techniques on online news articles text analytics

Nurul Atiqah Razmi, Muhammad Zharif Zamri, Sharifah Syafiera Syed Ghazalli, Noraini Seman
2021 Bulletin of Electrical Engineering and Informatics  
The finding from this study shows that Porter stemming performs better than Lancaster stemming, by 43%, based on the stemming error produced.  ...  The differences in the outputs that are resulted from the different stemming techniques are discussed based on the stemming error and the resulted visualization.  ...  ACKNOWLEDGEMENTS The authors would like to thank Universiti Teknologi MARA (UiTM) for the research funding and support via grant number 600-IRMI/PERDANA 5/3 BESTARI (107/2018).  ... 
doi:10.11591/eei.v10i1.2504 fatcat:xykhcdixwvhgvhn6brsk7iipke

Correctness, Strength and Similarity Evaluation of Stemming Algorithms for Arabic

Daoud Daoud, Christian Boitet
2014 The Egyptian Journal of Language Engineering  
In this paper, we present a comprehensive evaluation of four Arabic stemmers, based on metrics for correctness, strength and similarity. Two data sets were used in this study.  ...  Conclusions about correctness, strength and similarity of the four Arabic stemming algorithms are reported.  ...  An assessment approach for stemming algorithms was developed by Paice [3] , who evaluates the accuracy of a stemmer by counting the under-stemming and over-stemming errors it commits.  ... 
doi:10.21608/ejle.2014.59847 fatcat:j7womeyq6vek5jyrzpkecj6oge

Research on Node Detection Algorithm of Tomato Seedlings Based on Digital Image

Xue-guan ZHAO, Xiu WANG, Jin-wei ZHANG, Kai JIANG, Shuai SU
2018 DEStech Transactions on Computer Science and Engineering  
Through the test, it is found that the accuracy of main stem node detection is lowest at fourth nodes, which is 81%.These results demonstrate that our method has the ability to evaluate the vigor of tomato  ...  In the quality testing of tomato seedlings, optimization algorithm is proposed to extract tomato seedling stem node, using line scan algorithm to extract the main stem area, improve the accuracy of the  ...  Acknowledgement This research was financially supported by the Youth Research Fund of Beijing Academy of agricultural and Forestry Sciences (QNJJ201726).  ... 
doi:10.12783/dtcse/cmee2017/20006 fatcat:bekgcqwjavbsjgvgvmjqncl6pq

A Density-Based Algorithm for the Detection of Individual Trees from LiDAR Data

Melissa Latella, Fabio Sola, Carlo Camporeale
2021 Remote Sensing  
For all cases, the algorithm provides high accuracy tree count (F-score > 0.7) and satisfying stem locations (position error around 1.0 m).  ...  In this work, we propose a novel algorithm that aims to overcome these difficulties and yield the coordinates and the height of the individual trees on the basis of the point density features of the input  ...  Comparison between the count of actual trees and the count of the trees detected by the algorithm, the accuracy metrics, the position error, and the main statistics of the stem-to-top distance for each  ... 
doi:10.3390/rs13020322 fatcat:tiji5sipvzh6ndvdrjuq5adaqq

SPM-IS: An auto-algorithm to acquire a mature soybean phenotype based on instance segmentation

Shuai Li, Zhuangzhuang Yan, Yixin Guo, Xiaoyan Su, Yangyang Cao, Bofeng Jiang, Fei Yang, Zhanguo Zhang, Dawei Xin, Qingshan Chen, Rongsheng Zhu
2021 Crop Journal  
All authors agreed to be accountable for all aspects of their work to ensure that the questions related to the accuracy or integrity of any part is appropriately investigated and resolved, and approved  ...  for the final version to be published.  ...  [26] , which is based on a mask region-based convolutional neural network (Mask R-CNN) [27] to acquire parameters for stomatal pore anatomy.  ... 
doi:10.1016/j.cj.2021.05.014 fatcat:qiwh46atvfcs3g3s52ryb56q2m

An Automatic Arabic Essay Grading System based on Text Similarity Algorithms

Abdulaziz Shehab, Mahmoud Faroun, Magdi Rashad
2018 International Journal of Advanced Computer Science and Applications  
Manual grading process has many problems such as time consuming, costly, enormous resources, lot of efforts and huge pressure on instructors.  ...  This research compares the different algorithms used in automatic grading systems in Arabic languages using string and corpus algorithms separately.  ...  Four different methods Stop, Raw, Stop-Stem and Stem are used in testing for string-based algorithms.  ... 
doi:10.14569/ijacsa.2018.090337 fatcat:g3d26hvjyvea5abrwk3pc5twdy

Derivational and Inflectional Stemming Approach for the Filipino Part-of-Speech Tagging

Great Allan M. Ong
2018 International Journal for Research in Applied Science and Engineering Technology  
Since TPOST showed a high percentage on stemming errors and wrong feature extraction in the part-of-speech tagging, the evaluation was focused on strengthening this methods.  ...  stemming algorithm.  ...  COMPUTATION OF ERROR RATES The hybrid stemming was evaluated based on TAGSA's computation of error rates. This focus on the error counting of word samples derived from the actual text.  ... 
doi:10.22214/ijraset.2018.3578 fatcat:rmiurjgqmfeb7ffbelombw5aey

Tissue Expression Difference between mRNAs and lncRNAs

Lei Chen, Yu-Hang Zhang, Xiaoyong Pan, Min Liu, Shaopeng Wang, Tao Huang, Yu-Dong Cai
2018 International Journal of Molecular Sciences  
In addition, the rule learning algorithm, repeated incremental pruning to produce error reduction algorithm, was also employed to produce effective classification rules for classifying lncRNAs and mRNAs  ...  With advanced feature selection methods, such as maximum relevance minimum redundancy, incremental feature selection methods, and random forest algorithm, 13 features presented the dissimilarity of lncRNAs  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/ijms19113416 fatcat:qnnrf4v3inekzewhbgw5tjrxhi
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