Comparative study of brain deformation estimation methods

2006 ◽  
Author(s):  
Fenghong Liu ◽  
Keith D. Paulsen ◽  
Karen E. Lunn ◽  
Hai Sun ◽  
Alexander Hartov ◽  
...  
Keyword(s):  
Comparative Study ◽  
Estimation Methods ◽  
Brain Deformation

A Comparative Study of CIPN Symptom Estimation Methods Based on Machine Learning

2021 ◽  
Author(s):  
Satoki Hamanaka ◽  
Wataru Sasaki ◽  
Tadashi Okoshi ◽  
Jin Nakazawa ◽  
Kaori Yagasaki ◽  
...  
Keyword(s):  
Machine Learning ◽  
Comparative Study ◽  
Estimation Methods

Phase noise simulation and estimation methods: a comparative study

2002 ◽  
Vol 49 (9) ◽  
pp. 635-638 ◽  
Author(s):  
Yuxian Ou ◽  
N. Barton ◽  
R. Fetche ◽  
N. Seshan ◽  
T. Fiez ◽  
...  
Keyword(s):  
Comparative Study ◽  
Phase Noise ◽  
Estimation Methods ◽  
Noise Simulation

scholarly journals A Comparative Study of RGB and Multispectral Sensor-Based Cotton Canopy Cover Modelling Using Multi-Temporal UAS Data

2019 ◽  
Vol 11 (23) ◽  
pp. 2757 ◽  
Author(s):  
Akash Ashapure ◽  
Jinha Jung ◽  
Anjin Chang ◽  
Sungchan Oh ◽  
Murilo Maeda ◽  
...  
Keyword(s):  
Comparative Study ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Canopy Cover ◽  
Unmanned Aircraft ◽  
Estimation Methods ◽  
Green Vegetation ◽  
Multi Temporal ◽  
Rgb Images ◽  
Multispectral Sensors

This study presents a comparative study of multispectral and RGB (red, green, and blue) sensor-based cotton canopy cover modelling using multi-temporal unmanned aircraft systems (UAS) imagery. Additionally, a canopy cover model using an RGB sensor is proposed that combines an RGB-based vegetation index with morphological closing. The field experiment was established in 2017 and 2018, where the whole study area was divided into approximately 1 x 1 m size grids. Grid-wise percentage canopy cover was computed using both RGB and multispectral sensors over multiple flights during the growing season of the cotton crop. Initially, the normalized difference vegetation index (NDVI)-based canopy cover was estimated, and this was used as a reference for the comparison with RGB-based canopy cover estimations. To test the maximum achievable performance of RGB-based canopy cover estimation, a pixel-wise classification method was implemented. Later, four RGB-based canopy cover estimation methods were implemented using RGB images, namely Canopeo, the excessive greenness index, the modified red green vegetation index and the red green blue vegetation index. The performance of RGB-based canopy cover estimation was evaluated using NDVI-based canopy cover estimation. The multispectral sensor-based canopy cover model was considered to be a more stable and accurately estimating canopy cover model, whereas the RGB-based canopy cover model was very unstable and failed to identify canopy when cotton leaves changed color after canopy maturation. The application of a morphological closing operation after the thresholding significantly improved the RGB-based canopy cover modeling. The red green blue vegetation index turned out to be the most efficient vegetation index to extract canopy cover with very low average root mean square error (2.94% for the 2017 dataset and 2.82% for the 2018 dataset), with respect to multispectral sensor-based canopy cover estimation. The proposed canopy cover model provides an affordable alternate of the multispectral sensors which are more sensitive and expensive.

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