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Träfflista för sökning "WFRF:(Luengo Hendriks Cris L. 1974 ) "

Sökning: WFRF:(Luengo Hendriks Cris L. 1974 )

  • Resultat 1-10 av 26
  • [1]23Nästa
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  • Miettinen, Arttu, et al. (författare)
  • A non-destructive X-ray microtomography approach for measuring fibre length in short-fibre composites
  • 2012
  • Ingår i: Composites Science And Technology. - : Elsevier. - 0266-3538 .- 1879-1050. ; 72:15, s. 1901-1908
  • Tidskriftsartikel (refereegranskat)abstract
    • An improved method based on X-ray microtomography is developed for estimating fibre length distribution of short-fibre composite materials. In particular, a new method is proposed for correcting the biasing effects caused by the finite sample size as defined by the limited field of view of the tomographic devices. The method is first tested for computer generated fibre data and then applied in analyzing the fibre length distribution in three different types of wood fibre reinforced composite materials. The results were compared with those obtained by an independent method based on manual registration of fibres in images from a light microscope. The method can be applied in quality control and in verifying the effects of processing parameters on the fibre length and on the relevant mechanical properties of short fibre composite materials, e.g. stiffness, strength and fracture toughness.
  • Asplund, Teo, et al. (författare)
  • Mathematical Morphology on Irregularly Sampled Signals
  • 2017
  • Ingår i: ; , s. 506-520
  • Konferensbidrag (refereegranskat)abstract
    • This paper introduces a new operator that can be used to approximate continuous-domain mathematical morphology on irregularly sampled surfaces. We define a new way of approximating the continuous domain dilation by duplicating and shifting samples according to a flat continuous structuring element. We show that the proposed algorithm can better approximate continuous dilation, and that dilations may be sampled irregularly to achieve a smaller sampling without greatly compromising the accuracy of the result.
  • Wernersson, Erik, et al. (författare)
  • Accurate estimation of Gaussian and mean curvature in volumetric images
  • 2011
  • Ingår i: International Conference on 3D Imaging, Modeling, Processing, Visualization, and Transmission, 3DIMPVT 2011. ; , s. 312-317
  • Konferensbidrag (refereegranskat)abstract
    • Curvature is a useful low level surface descriptor of wood fibres in {3D} micro-CT images of paper and composite materials. It may for instance be used to differentiate between the outside and the inside (lumen) of wood fibre. Since the image acquisition introduces noise, some kind of smoothing is required to obtain accurate estimates of curvature. However, in these materials, the fibres of interest are frequently both thin and densely packed. In this paper, we show how existing methods fail to accurately capture curvature information under these circumstances. Maintained resolution and smoothing of noise are two competing goals. In some situations, existing methods will even estimate the wrong signs of the principal curvatures. We also present a novel method, which is shown to have better performance in several experiments. This new method will generically produce better curvature estimates for thin objects and objects in close proximity
  • Curic, Vladimir, et al. (författare)
  • Salience adaptive structuring elements
  • 2012
  • Ingår i: IEEE Journal on Selected Topics in Signal Processing. - : Institute of Electrical and Electronics Engineers (IEEE). - 1932-4553 .- 1941-0484. ; 6:7, s. 809-819
  • Tidskriftsartikel (refereegranskat)abstract
    • Spatially adaptive structuring elements adjust their shape to the local structures in the image, and are often defined by a ball in a geodesic distance or gray-weighted distance metric space. This paper introduces salience adaptive structuring elements as spatially variant structuring elements that modify not only their shape, but also their size according to the salience of the edges in the image. Morphological operators with salience adaptive structuring elements shift edges with high salience to a less extent than those with low salience. Salience adaptive structuring elements are less flexible than morphological amoebas and their shape is less affected by noise in the image. Consequently, morphological operators using salience adaptive structuring elements have better properties.
  • Fakhrzadeh, Azadeh, et al. (författare)
  • Analyzing Tubular Tissue in Histopathological Thin Sections
  • 2012
  • Konferensbidrag (refereegranskat)abstract
    • We propose a method for automatic segmentation of tubules in the stained thin sections of various tissue types. Tubules consist of one or more layers of cells surrounding a cavity. The segmented tubules can be used to study the morphology of the tissue. Some research has been done to automatically estimate the density of tubules. To the best of our knowledge, no one has been able to, fully automatically, segment the whole tubule. Usually the border between tubules is subtle and appears broken in a straight-forward segmentation. Here we suggest delineating these borders using the geodesic distance transform. We apply this method on images of Periodic Acid Shiffs (PAS) stained thin sections of testicular tissue, delineating 89% of the tubules correctly.
  • Fakhrzadeh, Azadeh, et al. (författare)
  • Epithelial Cell Segmentation in Histological Images of Testicular Tissue Using Graph-Cut
  • 2013
  • Ingår i: Image Analysis and Processing – ICIAP 2013. - : Springer Verlag (Germany): Series. - 9783642411830 - 9783642411847 ; 8157, s. 201-208
  • Konferensbidrag (refereegranskat)abstract
    • Computerized image processing has provided us with valuable tools for analyzing histology images. However, histology images are complex, and the algorithm which is developed for a data set may not work for a new and unseen data set. The preparation procedure of the tissue before imaging can significantly affect the resulting image. Even for the same staining method, factors like delayed fixation may alter the image quality. In this paper we face the challenging problem of designing a method that works on data sets with strongly varying quality. In environmental research, due to the distance between the site where the wild animals are caught and the laboratory, there is always a delay in fixation. Here we suggest a segmentation method based on the structural information of epithelium cell layer in testicular tissue. The cell nuclei are detected using the fast radial symmetry filter. A graph is constructed on top of the epithelial cells. Graph-cut optimization method is used to cut the links between cells of different tubules. The algorithm is tested on five different groups of animals. Group one is fixed immediately, three groups were left at room temperature for 18, 30 and 42 hours respectively, before fixation. Group five was frozen after 6 hours in room temperature and thawed. The suggested algorithm gives promising results for the whole data set.
  • Luengo, Cris, et al. (författare)
  • Constrained and Dimensionality-Independent Path Openings
  • 2010
  • Ingår i: IEEE Transactions on Image Processing. - : Institute of Electrical and Electronics Engineers (IEEE). - 1057-7149 .- 1941-0042. ; 19, s. 1587-1595
  • Tidskriftsartikel (refereegranskat)abstract
    • Path openings and closings are morphological operations with flexible line segments as structuring elements. These line segments have the ability to adapt to local image structures, and can be used to detect lines that are not perfectly straight. They also are a convenient and efficient alternative to straight line segments as structuring elements when the exact orientation of lines in the image is not known. These path operations are defined by an adjacency relation, which typically allows for lines that are approximately horizontal, vertical or diagonal. However, because this definition allows zig-zag lines, diagonal paths can be much shorter than the corresponding horizontal or vertical paths. This undoubtedly causes problems when attempting to use path operations for length measurements. This paper 1) introduces a dimensionality-independent implementation of the path opening and closing algorithm by Appleton and Talbot, 2) proposes a constraint on the path operations to improve their ability to perform length measurements, and 3) shows how to use path openings and closings in a granulometry to obtain the length distribution of elongated structures directly from a gray-value image, without a need for binarizing the image and identifying individual objects.
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  • Resultat 1-10 av 26
  • [1]23Nästa
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