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Meta ensemble learning in geospatial sentiment analysis and community survey mapping: a water supply case study

EARTH SCIENCE INFORMATICS 2024年第4期17卷 3233-3252页

作者： Vahidnia, Mohammad H. Shahid Beheshti Univ Fac Earth Sci Ctr Remote Sensing & GIS Res Tehran Iran

Amidst the proliferation of social media and online platforms, sentiment analysis stands out as a pivotal tool in Natural Language processing (NLP), facilitating the categorization of public opinions. The overarching goal of this study is to apply sentiment analysis techniques to assess public perceptions of water supply quality and provide decision-support maps for infrastructure planning. The primary research gap addressed in this study concerns the efficacious integration of spatial statistics methods with sentiment analysis for the purpose of generating zoning maps. This integration, offers a novel approach for understanding public perceptions and sentiments within specific geographical contexts. Sub-objectives of the study include aspects such as the development of a robust meta ensemble learning framework, the utilization of crowdsourced geographic information for sentiment analysis, and the evaluation of text mining techniques specific to water supply concerns. Our approach utilizes comments from subscribers of the Water Organization portal. The meta ensemble learning framework comprises six different combinations, including boosting, bagging, and voting solutions, drawing from various base estimators such as K-Nearest Neighbors (KNN), Decision Tree (DT), Support Vector Machine (SVM), Random Forest (RF), and Artificial Neural Network (ANN), alongside boosting techniques like AdaBoost and XGBoost. Results indicate that aggregating vectors from text feature extraction techniques such as Bag of Words (BoW), N-gram, and TF-IDF yielded optimal pattern recognition. AdaBoost emerged as the most effective model, as determined by metrics like Accuracy, F1-score, and AUC. Unreviewed subscriber comments were fed into the final model to predict unfavorable remarks, subsequently visualized on georeferenced maps. Geostatistical methods within Geographic Information Systems (GIS) were employed, including spatial kernel density, spatial join, natural breaks classification, a

关键词： Text mining Data mining VGI Water supply Geostatistics Machine learning Artificial intelligence Deep learning

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Self-supervised Vision Transformers for Land-cover Segmentation and Classification

Self-supervised Vision Transformers for Land-cover Segmentat...

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IEEE/CVF Conference on Computer Vision and pattern recognition (CVPR)

作者： Scheibenreif, Linus Hanna, Joelle Mommert, Michael Borth, Damian Univ St Gallen AIML Lab Sch Comp Sci Rosenbergstr 30 St Gallen Switzerland

ISBN: (纸本)9781665487399

Transformer models have recently approached or even surpassed the performance of ConvNets on computer vision tasks like classification and segmentation. To a large degree, these successes have been enabled by the use of large-scale labelled image datasets for supervised pre-training. This poses a significant challenge for the adaption of vision Transformers to domains where datasets with millions of labelled samples are not available. In this work, we bridge the gap between ConvNets and Transformers for Earth observation by self-supervised pre-training on large-scale unlabelled remote sensing data(1). We show that self-supervised pre-training yields latent task-agnostic representations that can be utilized for both land cover classification and segmentation tasks, where they significantly outperform the fully supervised baselines. Additionally, we find that subsequent fine-tuning of Transformers for specific downstream tasks performs on-par with commonly used ConvNet architectures. An ablation study further illustrates that the labelled dataset size can be reduced to one-tenth after self-supervised pre-training while still maintaining the performance of the fully supervised approach.

关键词： Training Earth Computer vision image segmentation Computational modeling Conferences Transformers

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A Fast Line and Ellipse Detection on High Resolution images 17th

A Fast Line and Ellipse Detection on High Resolution Image...

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17th Chinese Conference on image and Graphics Technologies and Applications, IGTA 2022

作者： Liu, Limin Li, Dingzhe Li, Zhaoxi Meng, Cai The Cyberspace Institute of Advanced Technology Guangzhou University Guangzhou510006 China Image Processing Center Beijing University of Aeronautics and Astronautics Beijing100191 China Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Beijing100083 China

ISBN: (纸本)9789811950957

Line and ellipse are important image features in pattern recognition and computer vision. Many methods have been developed to extract line or ellipse in images separately but few try to detect them simultaneously. In this paper, a novel fast line and ellipse detection (FLED) method is proposed to detect line and ellipse simultaneously, even in high resolution images. At first, a detection framework (Pre-SGV) for high detection speed is proposed, which explicitly decomposes the detection into precalculate, segment, grouping, validation phases. Secondly, a simple but efficient algorithm is designed to segment the edges into line or arc candidates. Thirdly, the grouping constraints and fitting methods are further improved. Finally, validation are conducted to exclude erroneous detection. Experiments on synthetic images and real image dataset show that the proposed method, FLED, can robustly detect lines and ellipses fast and efficiently, especially for high resolution image (e.g. remote sensing image, the scanning image). © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： pattern recognition

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Deep image Interpolation: A Unified Unsupervised Framework for Pansharpening

Deep Image Interpolation: A Unified Unsupervised Framework f...

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IEEE/CVF Conference on Computer Vision and pattern recognition (CVPR)

作者： Gao, Jianhao Li, Jie Su, Xin Jiang, Menghui Yuan, Qiangqiang Wuhan Univ Wuhan Peoples R China

ISBN: (数字)9781665487399

ISBN: (纸本)9781665487399

Pansharpening, whose aim is to acquire high resolution multispectral data (HRMS) by the fusion of low resolution multispectral data (LRMS) and panchromatic data (PAN), is a specific mission of spatial-spectral fusion in remote sensing field. In recent years, deep learning methods have proved the most feasible methods for pansharpening task. However, these deep learning methods have difficulty in training in an unsupervised manner and become useless when it comes to the condition where no training dataset is available. In this paper, we propose a universal algorithm called deep image interpolation for pansharpening task. The main idea is achieving high-quality fusion results by interpolating two low-quality multispectral images in a deep neural network. We apply it to two conditions: 1) unsupervised training a network when there are enough datasets;2) directly optimizing the fusion result where no training datasets are available. Simulation and real-data experiments are conducted on various kinds of satellite data. Quantitative and qualitative evaluation results illustrate that the proposed method outperforms traditional pansharpening methods and even catch up with those supervised methods to some extent.

关键词： Training Deep learning Interpolation Satellites Neural networks Data integration Pansharpening

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Comparative Performance of Maximum Likelihood and Minimum Distance Classifiers on Land Use and Land Cover Analysis of Varanasi District (India) 1

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2nd International Conference on Advanced Network Technologies and Intelligent Computing (ANTIC)

作者： Kumari, Annu Karthikeyan, S. Banaras Hindu Univ Dept Comp Sci Varanasi 221005 Uttar Pradesh India

ISBN: (数字)9783031281839

ISBN: (纸本)9783031281822;9783031281839

Monitoring the Land Use/Land Cover (LULC) changes in this present era has become the most demanding task and it is very crucial for planning, proper resource management, regulating the expansion in the fringe areas in the existing cities, etc. Now the collection of reliable data has become easier as the hyperspectral images captured by various remote sensing satellites are readily available in different spatial and spectral resolutions. processing this data according to the Region of Interest (ROI) in order to extract meaningful information is challenging. The most crucial part of this process is to identify various land covers very accurately. Only an automatic classification provides a feasible solution, as the manual process is tedious, expensive, and time-consuming. This paper compares two different image classification algorithms in classifying the covers, which can be utilized for land use and land cover changing pattern analysis in the Varanasi district of India. The experiments were carried out with the two most popular classification algorithms, namely: The Maximum Likelihood classifier and the Minimum Distance classifier. The overall accuracy and kappa co-Efficient values computed are 41.67 and 0.12 for the Minimum Distance Classifier and 82.43 and 0.78 for the Maximum Likelihood Classifier. It has been observed that the Maximum Likelihood Classifier outperforms the Minimum Distance Classifier.

关键词： Land use/land cover remote sensing image classifier Geographic information analysis

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Rethinking Transformers Pre-training for Multi-Spectral Satellite imagery

Rethinking Transformers Pre-training for Multi-Spectral Sate...

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Conference on Computer Vision and pattern recognition (CVPR)

作者： Mubashir Noman Muzammal Naseer Hisham Cholakkal Rao Muhammad Anwar Salman Khan Fahad Shahbaz Khan Mohamed bin Zayed University of AI Australian National University Linkoping University

ISBN: (数字)9798350353006

ISBN: (纸本)9798350353013

Recent advances in unsupervised learning have demonstrated the ability of large vision models to achieve promising results on downstream tasks by pre-training on large amount of unlabelled data. Such pre-training techniques have also been explored recently in the remote sensing domain due to the availability of large amount of unlabelled data. Different from standard natural image datasets, remote sensing data is acquired from various sensor technologies and exhibit diverse range of scale variations as well as modalities. Existing satellite image pre-training methods either ignore the scale information present in the remote sensing imagery or restrict themselves to use only a single type of data modality. In this paper, we re-visit transformers pre-training and leverage multi-scale information that is effectively utilized with multiple modalities. Our proposed approach, named SatMAE++, performs multi-scale pre-training and utilizes convolution based upsampling blocks to reconstruct the image at higher scales making it extensible to include more scales. Compared to existing works, the proposed SatMAE++ with multi-scale pre-training is equally effective for both optical as well as multi-spectral imagery. Extensive experiments on six datasets reveal the merits of proposed contributions, leading to state-of-the-art performance on all datasets. Sat-MAE++ achieves mean average precision (mAP) gain of 2.5% for multi-label classification task on BigEarthNet dataset. Our code and pre-trained models are available at https://***/techmn/satmae_pp.

关键词： image resolution Transformers Optical imaging Satellite images pattern recognition Optical sensors remote sensing

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A fast bundle adjustment method based on track selection 4

A fast bundle adjustment method based on track selection

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4th International Conference on Computer Vision and pattern Analysis, ICCPA 2024

作者： Liu, Changwei Xiong, Pingfan Yang, Luman Chen, Song Hu, Jinquan School of Remote Sensing and Information Engineering Wuhan University Hubei Wuhan430072 China School of Geodesy and Geomatics Wuhan University Hubei Wuhan430072 China Guangdon Shenzhen518000 China Wuhan Tianjihang Information Technology Co. Ltd. Hubei Wuhan430074 China

ISBN: (纸本)9781510682528

Bundle adjustment is the core of the Structure from Motion algorithm, and it is also a very time-consuming part, in which redundant observations and initial parameter values with large errors increase the time consumption of the algorithm. In order to improve the efficiency of bundle adjustment, we propose an track selection method based on uniformity, accuracy, coverage and connectivity criteria. Firstly, we divide the space of tracks into several 3D grids. Secondly, we start from the grid with the largest number of tracks, and eliminate the redundant tracks with low connectivity and low accuracy in each grid, while ensuring the connectivity and coverage of tracks. Finally, we use a variety of experimental data to verify this algorithm. The result shows that the algorithm can delete a large number of redundant tracks, and effectively improve the efficiency of the bundle adjustment method on the premise of ensuring the accuracy. When the track retention rate is 0.4, the efficiency of the bundle adjustment method is increased by about 2 times, and the corresponding precision loss value is 0.026. © 2024 SPIE.

关键词： Tunable filters 3D tracking image restoration Point clouds 3D image reconstruction image filtering image processing Pose estimation 3D modeling Atomic force microscopy

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image processing and Control of Tracking Intelligent Vehicle Based on Grayscale Camera 5

Image Processing and Control of Tracking Intelligent Vehicle...

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5th IEEE International Conference on image processing Applications and Systems (IPAS)

作者： Zhang, Jian Liu, Yufan Li, Ao Zeng, Jinshan Xie, Hongtu Sun Yat Sen Univ Sch Elect & Commun Engn Shenzhen Campus Shenzhen Peoples R China Nanchang Hangkong Univ Sch Informat Engn Nanchang Jiangxi Peoples R China

ISBN: (纸本)9781665462198

In order to realize the rapid and stable recognition and automatic tracking of various complex roads by the intelligent vehicles, this paper proposes image processing and cascade Proportion Integration Differentiation (PID) steering and speed control algorithms based on CMOS grayscale cameras in the context of the national college student intelligent vehicle competition. First, the grayscale image of the track is acquired by the grayscale camera. Then, the Otsu method is used to binarize the image, and the information of black boundary guide line is extracted. In order to improve the speed of the race, various track elements in the image are identified and classified, and the deviation between the actual centerline position and the ideal centerline position of the intelligent vehicle is calculated. Third, the discrete incremental cascade PID control algorithm is used to calculate the pulse width modulation (PWM) signal corresponding to the deviation. And the PWM signal is acted on the steering motor through the driving circuit, driving the intelligent vehicle to always drive along the middle road, so as to achieve the purpose of automatic tracking guidance. Experiments prove that the intelligent vehicle of this design can identify complex roads quickly and in a stable way, accurately complete automatic tracking, and obtain higher speed performance.

关键词： tracking intelligent vehicle proportional integral derivative control CMOS grayscale camera binary image image processing

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recognition of wheat rusts in a field environment based on improved DenseNet

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BIOSYSTEMS ENGINEERING 2024年 238卷 10-21页

作者： Chang, Shenglong Yang, Guijun Cheng, Jinpeng Fan, Zehua Ma, Xinming Li, Yong Yang, Xiaodong Zhao, Chunjiang Henan Agr Univ Coll Agron Zhengzhou 450002 Peoples R China Beijing Acad Agr & Forestry Sci Informat Technol Res Ctr Key Lab Quantitat Remote Sensing Agr Minist Agr & Rural Affairs Beijing 100097 Peoples R China

Currently, the main methods for detecting plant diseases are sampling and manual visual inspection. However, these methods are time-consuming, laborious and prone to misinterpretation. Rapid advances in Deep Learning (DL) techniques offer new possibilities. This study focused on analysing the confounding factors among three types of wheat rust (stripe rust, leaf rust and stem rust) and aimed to achieve higher classification accuracy. The following approaches were used: (1) images were collected from several crops and diseases: Wheat Rusts Dataset (WRD), Wheat Common Disease Dataset (WDD), and Common Poaceae Disease Dataset (PDD);(2) Seven common convolutional neural network (CNN) models were made and their performance compared. DenseNet121 was selected as the base model, and its classification results further analysed. The results of the above analyses were then considered using phenotypic morphology and model structure analysis, as well as potential confounder discussions;(3) Adjustments and optimisations were made based on the identified confounding factors. The final improved model, designated Imp-DenseNet, achieved the following accuracies with different datasets: Top-1 accuracy = 98.32% (WRD), Top-3 accuracy = 97.30% (WDD) and Top-5 accuracy = 96.60% (PDD) (Top-x Accuracy refers to the accuracy of the top-ranked category that matches or containing the actual results). The study revealed the potential factors contributing to the confusion among the three wheat rusts and successfully achieved higher accuracy. It can provide a new perspective for future research on other diseases of wheat or other crops.

关键词： Plant disease Wheat rust image processing Deep learning Computer vision (CV) DenseNet

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Research on Aircraft Whole day Location Technology Based on Aerial and remote sensing image Matching 23

Research on Aircraft Whole day Location Technology Based on ...

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Proceedings of the 2023 6th International Conference on Artificial Intelligence and pattern recognition

作者： Pingan Qiao Xiaofan Zhang Ziying Lei Dongfang Yang Xi'an University of Posts and Telecommunications China Xian High tech research Institute China

ISBN: (纸本)9798400707674

Nowadays, aircraft positioning is mainly based on GNSS, but GNSS signal receiving equipment is difficult to ensure the stability and reliability of the positioning signal in the presence of obstruction or strong electromagnetic interference environments. In recent years, with the development of image matching technology, intelligent positioning technology for aircraft based on remote sensing image feature matching has received widespread attention. This article conducts research on the problem of aircraft positioning based on aerial photography and remote sensing image matching. Firstly, in order to solve the problem of significant differences in style between remote sensing images and aerial images, resulting in poor direct matching results, the CycleGAN style transfer network was used as the basis to study the style transfer of remote sensing images and reduce the differences between different modal images; Secondly, based on the LoFTR matching algorithm, the matching between remote sensing images and aerial images after style transfer was studied; Finally, in order to solve the problem of aircraft positioning based on image matching, the application of homography transformation in remote sensing and aerial image matching mapping was studied, and a method for calculating geographic location after successful image matching was provided. Finally, the method proposed in this paper was validated through experiments.

关键词： Deep learning image style transfer remote sensing image matching UAV visual positioning

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