Detection and segmentation of vine canopy in ultra-high spatial resolution RGB imagery obtained from unmanned aerial vehicle (UAV) :a case study in a commercial vineyard
The use of Unmanned Aerial Vehicles (UAVs) in viticulture permits the capture of aerial Red-Green-Blue (RGB) images with an ultra-high spatial resolution. Recent studies have demonstrated that RGB images can be used to monitor spatial variability of vine biophysical parameters. However, for estimati...
| Main Authors: | , , , |
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| Format: | Artículo |
| Language: | Inglés |
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2017
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| Online Access: | http://hdl.handle.net/20.500.12123/1402 http://mdpi.com/2072-4292/9/3/268 https://doi.org/10.3390/rs9030268 |
| _version_ | 1855482881932001280 |
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| author | Poblete Echeverria, Carlos Olmedo, Guillermo Federico Ingram, Ben Bardeen, Matthew |
| author_browse | Bardeen, Matthew Ingram, Ben Olmedo, Guillermo Federico Poblete Echeverria, Carlos |
| author_facet | Poblete Echeverria, Carlos Olmedo, Guillermo Federico Ingram, Ben Bardeen, Matthew |
| author_sort | Poblete Echeverria, Carlos |
| collection | INTA Digital |
| description | The use of Unmanned Aerial Vehicles (UAVs) in viticulture permits the capture of aerial Red-Green-Blue (RGB) images with an ultra-high spatial resolution. Recent studies have demonstrated that RGB images can be used to monitor spatial variability of vine biophysical parameters. However, for estimating these parameters, accurate and automated segmentation methods are required to extract relevant information from RGB images. Manual segmentation of aerial images is a laborious and time-consuming process. Traditional classification methods have shown satisfactory results in the segmentation of RGB images for diverse applications and surfaces,however, in the case of commercial vineyards, it is necessary to consider some particularities inherent to canopy size in the vertical trellis systems (VSP) such as shadow effect and different soil conditions in inter-rows (mixed information of soil and weeds). Therefore, the objective of this study was to compare the performance of four classification methods (K-means, Artificial Neural Networks (ANN), Random Forest (RForest) and Spectral Indices (SI)) to detect canopy in a vineyard trained on VSP. Six flights were carried out from post-flowering to harvest in a commercial vineyard cv. Carménère using a low-cost UAV equipped with a conventional RGB camera. The results show that the ANN and the simple SI method complemented with the Otsu method for thresholding presented the best performance for the detection of the vine canopy with high overall accuracy values for all study days. Spectral indices presented the best performance in the detection of Plant class (Vine canopy) with an overall accuracy of around 0.99. However, considering the performance pixel by pixel, the Spectral indices are not able to discriminate between Soil and Shadow class. The best performance in the classification of three classes (Plant, Soil, and Shadow) of vineyard RGB images, was obtained when the SI values were used as input data in trained methods (ANN and RForest), reaching overall accuracy values around 0.98 with high sensitivity values for the three classes. |
| format | Artículo |
| id | INTA1402 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| record_format | dspace |
| spelling | INTA14022019-11-25T14:47:22Z Detection and segmentation of vine canopy in ultra-high spatial resolution RGB imagery obtained from unmanned aerial vehicle (UAV) :a case study in a commercial vineyard Poblete Echeverria, Carlos Olmedo, Guillermo Federico Ingram, Ben Bardeen, Matthew Agricultura de Precisión Viticultura Teledetección Análisis de Imágenes Viticulture Precision Agriculture Remote Sensing Image Analysis The use of Unmanned Aerial Vehicles (UAVs) in viticulture permits the capture of aerial Red-Green-Blue (RGB) images with an ultra-high spatial resolution. Recent studies have demonstrated that RGB images can be used to monitor spatial variability of vine biophysical parameters. However, for estimating these parameters, accurate and automated segmentation methods are required to extract relevant information from RGB images. Manual segmentation of aerial images is a laborious and time-consuming process. Traditional classification methods have shown satisfactory results in the segmentation of RGB images for diverse applications and surfaces,however, in the case of commercial vineyards, it is necessary to consider some particularities inherent to canopy size in the vertical trellis systems (VSP) such as shadow effect and different soil conditions in inter-rows (mixed information of soil and weeds). Therefore, the objective of this study was to compare the performance of four classification methods (K-means, Artificial Neural Networks (ANN), Random Forest (RForest) and Spectral Indices (SI)) to detect canopy in a vineyard trained on VSP. Six flights were carried out from post-flowering to harvest in a commercial vineyard cv. Carménère using a low-cost UAV equipped with a conventional RGB camera. The results show that the ANN and the simple SI method complemented with the Otsu method for thresholding presented the best performance for the detection of the vine canopy with high overall accuracy values for all study days. Spectral indices presented the best performance in the detection of Plant class (Vine canopy) with an overall accuracy of around 0.99. However, considering the performance pixel by pixel, the Spectral indices are not able to discriminate between Soil and Shadow class. The best performance in the classification of three classes (Plant, Soil, and Shadow) of vineyard RGB images, was obtained when the SI values were used as input data in trained methods (ANN and RForest), reaching overall accuracy values around 0.98 with high sensitivity values for the three classes. EEA Mendoza Fil: Poblete Echeverria, Carlos. Pontificia Universidad Católica de Valparaíso. Escuela de Agronomía; Chile. Stellenbosch University. Faculty of AgriSciences. Department of Viticulture and Oenology; Sudáfrica Fil: Olmedo, Guillermo Federico. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Mendoza; Argentina Fil: Ingram, Ben. Universidad de Talca. Facultad de Ingeniería; Chile Fil: Bardeen, Matthew. Universidad de Talca. Facultad de Ingeniería; Chile 2017-10-04T13:36:36Z 2017-10-04T13:36:36Z 2017 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion info:ar-repo/semantics/artículo http://hdl.handle.net/20.500.12123/1402 http://mdpi.com/2072-4292/9/3/268 2072-4292 https://doi.org/10.3390/rs9030268 eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf Remote sensing 9 (3) : 268. (March 2017) |
| spellingShingle | Agricultura de Precisión Viticultura Teledetección Análisis de Imágenes Viticulture Precision Agriculture Remote Sensing Image Analysis Poblete Echeverria, Carlos Olmedo, Guillermo Federico Ingram, Ben Bardeen, Matthew Detection and segmentation of vine canopy in ultra-high spatial resolution RGB imagery obtained from unmanned aerial vehicle (UAV) :a case study in a commercial vineyard |
| title | Detection and segmentation of vine canopy in ultra-high spatial resolution RGB imagery obtained from unmanned aerial vehicle (UAV) :a case study in a commercial vineyard |
| title_full | Detection and segmentation of vine canopy in ultra-high spatial resolution RGB imagery obtained from unmanned aerial vehicle (UAV) :a case study in a commercial vineyard |
| title_fullStr | Detection and segmentation of vine canopy in ultra-high spatial resolution RGB imagery obtained from unmanned aerial vehicle (UAV) :a case study in a commercial vineyard |
| title_full_unstemmed | Detection and segmentation of vine canopy in ultra-high spatial resolution RGB imagery obtained from unmanned aerial vehicle (UAV) :a case study in a commercial vineyard |
| title_short | Detection and segmentation of vine canopy in ultra-high spatial resolution RGB imagery obtained from unmanned aerial vehicle (UAV) :a case study in a commercial vineyard |
| title_sort | detection and segmentation of vine canopy in ultra high spatial resolution rgb imagery obtained from unmanned aerial vehicle uav a case study in a commercial vineyard |
| topic | Agricultura de Precisión Viticultura Teledetección Análisis de Imágenes Viticulture Precision Agriculture Remote Sensing Image Analysis |
| url | http://hdl.handle.net/20.500.12123/1402 http://mdpi.com/2072-4292/9/3/268 https://doi.org/10.3390/rs9030268 |
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