Observer-dependent variability of the thresholding step in the quantitative analysis of soil images and X-ray microtomography data
文献类型：期刊论文
| 作者 | Baveye, Philippe C.1; Laba, Magdeline2; Otten, Wilfred1; Bouckaert, Liesbeth3; Dello Sterpaio, Patricia1; Goswami, Rohit R.4; Grinev, Dmitri1; Houston, Alasdair1; Hu, Yaoping5; Liu, Jianli |
| 刊名 | GEODERMA
 |
| 出版日期 | 2010-06-15 |
| 卷号 | 157期号:1-2页码:51-63 |
| 关键词 | Image analysis Computed tomography Lattice-Boltzmann modelling Pore geometry Soil architecture |
| ISSN号 | 0016-7061 |
| DOI | 10.1016/j.geoderma.2010.03.015 |
| 通讯作者 | Baveye, Philippe C.(P.Baveye@Abertay.ac.uk) |
| 英文摘要 | For the investigation of many geometrical features of soils, computer-assisted image analysis has become a method of choice over the last few decades. This analysis involves numerous steps, regarding which subjective decisions have to be made by the individuals conducting the research. This is particularly the case with the thresholding step, required to transform the original (color or greyscale) images into the type of binary representation (e.g., pores in white, solids in black) needed for fractal analysis or simulation with Lattice-Boltzmann models. Limited information exists at present on whether different observers, analyzing the same soil, would be likely to obtain similar results. In this general context, the first objective of the research reported in this article was to determine, through a so-called "round-robin" test, how much variation exists among the outcomes of various image thresholding strategies (including any image pretreatment deemed appropriate), routinely adopted by soil scientists. Three test images - of a field soil, a soil thin section, and a virtual section through a 3-dimensional CT data set - were thresholded by 13 experts, worldwide. At the same time, variability of the outcomes of a set of automatic thresholding algorithms, applied to portions of the test images, was also investigated. The experimental results obtained illustrate the fact that experts rely on very different approaches to threshold images of soils, and that there is considerable observer influence associated with this thresholding. This observer dependence is not likely to be alleviated by adoption of one of the many existing automatic thresholding algorithms, many of which produce thresholded images that are equally, or even more, variable than those of the experts. These observations suggest that, at this point, analysis of the same image of a soil, be it a simple photograph or 3-dimensional X-ray CT data, by different individuals can lead to very different results, without any assurance that any of them would be even approximately "correct" or best suited to the objective at hand. Different strategies are proposed to cope with this situation, including the use of physical "standards", adoption of procedures to assess the accuracy of thresholding, benchmarking with physical measurements, or the development of computational methods that do not require binary images. (C) 2010 Elsevier B.V. All rights reserved. |
| 收录类别 | SCI |
| WOS关键词 | DYE TRACER EXPERIMENTS ; IN-FIELD SOILS ; PREFERENTIAL FLOW ; THIN-SECTIONS ; SOLUTE TRANSPORT ; FRACTAL CHARACTERISTICS ; COMPUTED-TOMOGRAPHY ; DATA SET ; RESOLUTION ; PATTERNS |
| WOS研究方向 | Agriculture |
| WOS类目 | Soil Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000278651500006 |
| 出版者 | ELSEVIER SCIENCE BV |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2558851 |
| 专题 | 南京土壤研究所 |
| 通讯作者 | Baveye, Philippe C. |
| 作者单位 | 1.Abertay Univ, SIMBIOS Ctr, Dundee DD1 1HG, Scotland 2.Cornell Univ, Sch Civil & Environm Engn, Ithaca, NY 14853 USA 3.Univ Ghent, Dept Soil Management & Soil Care, B-9000 Ghent, Belgium 4.Geosyntec Consultants, Boca Raton, FL 33487 USA 5.Univ Calgary, Dept Elect & Comp Engn, Schulich Sch Engn, Calgary, AB T2N 1N4, Canada 6.Chinese Acad Sci, Dept Soil Phys & Salin, Inst Soil Sci, Nanjing 210008, Peoples R China 7.Univ Nottingham, Sch Biosci, Nottingham NG7 2RD, England 8.UPM, Dept Appl Math Agr Engn, Madrid 28040, Spain 9.Michigan State Univ, Dept Crop & Soil Sci, E Lansing, MI 48824 USA 10.Tubitak Marmara Res Ctr, Informat Technol Res Inst, Gebze, Kocaeli, Turkey |
| 推荐引用方式 GB/T 7714 | Baveye, Philippe C.,Laba, Magdeline,Otten, Wilfred,et al. Observer-dependent variability of the thresholding step in the quantitative analysis of soil images and X-ray microtomography data[J]. GEODERMA,2010,157(1-2):51-63. |
| APA | Baveye, Philippe C..,Laba, Magdeline.,Otten, Wilfred.,Bouckaert, Liesbeth.,Dello Sterpaio, Patricia.,...&Sezgin, Mehmet.(2010).Observer-dependent variability of the thresholding step in the quantitative analysis of soil images and X-ray microtomography data.GEODERMA,157(1-2),51-63. |
| MLA | Baveye, Philippe C.,et al."Observer-dependent variability of the thresholding step in the quantitative analysis of soil images and X-ray microtomography data".GEODERMA 157.1-2(2010):51-63. |
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来源：南京土壤研究所
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