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Evaluation of steerable filter for detection of fibers in flowing suspensions

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Abstract

Steerable filters are concluded to be useful in order to determine the orientation of fibers captured in digital images. The fiber orientation is a key variable in the study of flowing fiber suspensions. Here, digital image analysis based on a filter within the class of steerable filters is evaluated for suitability of finding the position and orientation of fibers suspended in flowing suspensions. In sharp images with small noise levels, the steerable filter succeeds in determining the orientation of artificially generated fibers with well-defined angles. The influence of reduced image quality on the orientation has been quantified. The effect of unsharpness and noise is studied and the results show that the error in orientation is less than 1° for moderate levels. Images from two flow cases, one laminar shear flow and one turbulent, are also analyzed. The fiber orientation distribution is determined in the flow-vorticity plane. For the laminar case a comparison is made to a robust, but computationally more expensive, method involving convolutions with an oriented elliptic filter. A good agreement is found when comparing the resulting fiber orientation distributions obtained with the two methods. For the turbulent case, it is demonstrated that correct results are obtained and that the method can handle overlapping fibers.

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Acknowledgments

This work has been supported by the European Union FP6 project EcoTarget, Wallenberg Wood Science Center and the Swedish Research Council.

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Author notes

  1. Allan Carlsson

    Present address: Division of Biomedical Engineering, School of Engineering, University of Glasgow, Glasgow, G12 8LT, UK

Authors and Affiliations

  1. Linné Flow Centre, KTH Mechanics, Royal Institute of Technology, SE, 100 44, Stockholm, Sweden

    Allan Carlsson & Fredrik Lundell

  2. Wallenberg Wood Science Center, KTH Mechanics, Royal Institute of Technology, SE, 100 44, Stockholm, Sweden

    Karl Håkansson, Mathias Kvick & L. Daniel Söderberg

  3. Innventia AB, Box 5604, SE, 114 86, Stockholm, Sweden

    L. Daniel Söderberg

Authors
  1. Allan Carlsson
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  2. Karl Håkansson
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  3. Mathias Kvick
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  4. Fredrik Lundell
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  5. L. Daniel Söderberg
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Corresponding author

Correspondence to Fredrik Lundell.

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Carlsson, A., Håkansson, K., Kvick, M. et al. Evaluation of steerable filter for detection of fibers in flowing suspensions. Exp Fluids 51, 987–996 (2011). https://doi.org/10.1007/s00348-011-1115-1

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  • DOI: https://doi.org/10.1007/s00348-011-1115-1

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