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Improving hyperspec...
Improving hyperspectral image segmentation by applying inverse noise weighting and outlier removal for optimal scale selection
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Dao, P. D. (författare)
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Mantripragada, K. (författare)
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He, Y. (författare)
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Qureshi, F. Z. (författare)
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- Elsevier B.V. 2021
- 2021
- Engelska.
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Ingår i: ISPRS journal of photogrammetry and remote sensing (Print). - : Elsevier B.V.. - 0924-2716 .- 1872-8235. ; 171, s. 348-366
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Optimal scale selection for image segmentation is an essential component of the Object-Based Image Analysis (OBIA) and interpretation. An optimal segmentation scale is a scale at which image objects, overall, best represent real-world ground objects and features across the entire image. At this scale, the intra-object variance is ideally lowest and the inter-object spatial autocorrelation is ideally highest, and a change in the scale could cause an abrupt change in these measures. Unsupervised parameter optimization methods typically use global measures of spatial and spectral properties calculated from all image objects in all bands as the target criteria to determine the optimal segmentation scale. However, no studies consider the effect of noise in image spectral bands on the segmentation assessment and scale selection. Furthermore, these global measures could be affected by outliers or extreme values from a small number of objects. These issues may lead to incorrect assessment and selection of optimal scales and cause the uncertainties in subsequent segmentation and classification results. These issues become more pronounced when segmenting hyperspectral data with large spectral variability across the spectrum. In this study, we propose an enhanced method that 1) incorporates the band's inverse noise weighting in the segmentation and 2) detects and removes outliers before determining segmentation scale parameters. The proposed method is evaluated on three well-established segmentation approaches – k-means, mean-shift, and watershed. The generated segments are validated by comparing them with reference polygons using normalized over-segmentation (OS), under-segmentation (US), and the Euclidean Distance (ED) indices. The results demonstrate that this proposed scale selection method produces more accurate and reliable segmentation results. The approach can be applied to other segmentation selection criteria and are useful for automatic multi-parameter tuning and optimal scale parameter selections in OBIA methods in remote sensing. © 2020 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS)
Nyckelord
- Hyperspectral image classification
- Image segmentation
- Inverse noise weighting
- Object-Based Image Analysis
- Optimal scale selection
- Outlier detection
- Image denoising
- Image enhancement
- Inverse problems
- Remote sensing
- Scales (weighing instruments)
- Spectroscopy
- Statistics
- Classification results
- Object based image analysis (OBIA)
- Optimal segmentation
- Parameter optimization methods
- Segmentation results
- Spatial autocorrelations
- Spectral properties
- Spectral variability
- autocorrelation
- image analysis
- optimization
- segmentation
- spectral analysis
- United States
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- art (ämneskategori)
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