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  • 151.
    Yang, Li
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Fogden, Andrew
    Institute for Surface Chemistry, Stockholm.
    Pauler, Nils
    Mid Sweden University.
    Saevborg, Oerjan
    Stora Enso Research Center.
    Kruse, Björn
    Linköping University, Department of Science and Technology, Digital Media. Linköping University, The Institute of Technology.
    Studying ink penetration with microscopic and spectroscopic techniques2006In: Journal of Imaging Science and Technology, ISSN 1062-3701, E-ISSN 1943-3522, Vol. 50, no 4, p. 327-332Article in journal (Refereed)
    Abstract [en]

    Distribution of ink jet ink in paper substrates and the consequences of ink penetration for printing color reproduction have been studied by combining microscopic image processing with spectroscopic analysis. The study focused on the effects of the composition of uncoated paper, for five laboratory papers plus two commercial products, all consisting of similar pulps but with different combinations of additives. In particular, it was observed that hydrophobizing internal size agents significantly reduced ink penetration, while their effect on paper optical properties was negligible. This observation thus made it possible to study experimentally the pure effects of ink penetration. Pairwise comparisons of prints on such laboratory papers with identical optical properties revealed remarkable impacts of ink penetration on optical density, causing color saturation reduction and color shift. These experimental observations confirmed the theoretical predictions.

  • 152.
    Yang, Li
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Fogden, Andrew
    Pauler, Nils
    Sävborg, Örjan
    Kruse, Björn
    Linköping University, Department of Science and Technology, Digital Media. Linköping University, The Institute of Technology.
    A novel method for studying ink penetration of a print2005In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 20, no 4, p. 423-429Article in journal (Refereed)
    Abstract [en]

    A method combining microscopy with image analysis for studying ink penetration of ink-jet prints has been proposed. Prints on paper substrates of various material compositions have been microtomed, imaged with optical microscopy, and analyzed with image processing. The penetration depth and distribution of the ink-jet dye in the paper, which depend on the material compositions of the substrates and printed ink volumes, are then obtained by means of statistical analysis. The study focuses on uncoated fine papers, including five types of hand-sheets and two commercial papers. It is observed that ink penetration can be significantly reduced by adding internal sizing (hydrophobizing) chemicals in the hand-sheet making, while it is relatively less affected by addition of filler and fluorescent whitening agent (FWA). Ink volume obviously influences the depth of its penetration, with depth increasing linearly for higher ink volumes but displaying a disproportionately shallow penetration for smaller applied volumes.

  • 153.
    Yang, Li
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Gooran, Sasan
    Linköping University, Department of Science and Technology, Digital Media. Linköping University, The Institute of Technology.
    Kruse, Björn
    Linköping University, Department of Science and Technology, Digital Media. Linköping University, The Institute of Technology.
    Simulation of optical dot gain in multichromatic tone production2001In: Journal of Imaging Science And Technology, ISSN 8750-9237, Vol. 45, no 2, p. 198-204Article in journal (Refereed)
    Abstract [en]

    Optical dot gain (light scattering or Yule-Nielsen effect) is an important effect influencing the quality of tone reproductions. Based on probability descriptions on the light scattering, a framework is established for describing this effect on the reflectance and color appearance of a chromatic halftone image. General expressions for the reflectance and CIEXYZ tristimulus values have been derived. Simulations for images printed with 2 inks have been carried out by applying Gaussian type of point spread function (PSF). Dependence of the optical dot gain on the optical properties of substrate and inks, the dot geometry etc., have been studied in detail.

  • 154.
    Yang, Li
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Kruse, Björn
    Linköping University, Department of Science and Technology, Digital Media. Linköping University, The Institute of Technology.
    Evaluation of the effects of ink penetration in ink jet printing: Experiments and simulation2004In: Journal of Imaging Science And Technology, ISSN 8750-9237, Vol. 48, no 3, p. 260-264Article in journal (Refereed)
  • 155.
    Yang, Li
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Kruse, Björn
    Linköping University, Department of Science and Technology, Digital Media. Linköping University, The Institute of Technology.
    Revised Kubelka-Munk theory. I. Theory and application2004In: Journal of the Optical Society of America A: Optics and Image Science, and Vision, ISSN 1084-7529, Vol. 21, no 10, p. 1933-1941Article in journal (Refereed)
    Abstract [en]

    Using a statistical analysis of light propagation in media, we propose a revision to Kubelka-Munk (K-M) theory by taking into account the effect of scattering on the path length of light propagation (path variation). This leads to new relationships between the K-M scattering S and absorbing K coefficients and the intrinsic scattering s and absorbing a coefficients of a material that indicate that the S and K coefficients depend nonlinearly on both a and s. The additivity law that bridges K-M S and K coefficients of a composite medium, such as dye-dispersed paper (dyed paper) and those of its material components (dye and paper), is also revised. It is further shown that experimental findings on dyed paper that the original K-M theory failed to explain can be clearly understood and accommodated by the new K-M theoretical framework (two-flux approach). Numerical simulations with the revised theory on model ink, paper, and dyed paper have been carried out.

  • 156.
    Yang, Li
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Kruse, Björn
    Linköping University, Department of Science and Technology, Digital Media. Linköping University, The Institute of Technology.
    Miklavcic, Stan
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Revised Kubelka-Munk theory. II. Unified framework for homogeneous and inhomogeneous optical media2004In: Journal of the Optical Society of America A: Optics and Image Science, and Vision, ISSN 1084-7529, Vol. 21, no 10, p. 1942-1952Article in journal (Refereed)
    Abstract [en]

    We extend the applicability of the recently revised Kubelka-Munk (K-M) theory to inhomogeneous optical media by treating inhomogeneous ink penetration of the substrate. We propose a method for describing light propagation in either homogeneous or inhomogeneous layers using series representations for the K-M scattering and absorption coefficients as well as for intensities of the upward and downward light streams. The conventional and matrix expressions for spectral reflectance and transmittance values of optically homogeneous media in the K-M theory are shown to be special cases of the present framework. Three types of ink distribution - homogeneous, linear, and exponential - have been studied. Simulations of spectral reflectance predict a depression of reflectance peaks and reduction of absorption bands characteristic of hue shifts and significant reduction of saturation and, in turn, color gamut.

  • 157.
    Yang, Li
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Lenz, Reiner
    Linköping University, Center for Medical Image Science and Visualization, CMIV. Linköping University, Department of Science and Technology, Digital Media. Linköping University, The Institute of Technology.
    Kruse, Björn
    Linköping University, Department of Science and Technology, Digital Media. Linköping University, The Institute of Technology.
    Light scattering and ink penetration effects on tone reproduction2001In: Journal of the Optical Society of America A, ISSN 0740-3232, Vol. 18, no 2, p. 360-366Article in journal (Refereed)
    Abstract [en]

    Light scattering, or the so-called Yule-Nielsen effect, and ink penetration into the substrate paper play important roles in tone reproduction. We develop a framework in which the influences of both of these effects on the reflectance and tristimulus values of a halftone sample are investigated. The properties of the paper and the ink and their bilateral interaction can be parameterized by the reflectance R-p(0) of the substrate paper, the transmittance T-i of the ink layer, the parameter gamma describing the ink penetration, and (p) over bar describing the Yule-Nielsen effect. We derive explicit expressions that relate the reflectance of the ink dots (R-i), the paper (R-p) and the halftone image (R) as functions of these parameters, We also describe the optical dot gain as a function of these parameters. We further demonstrate that ink penetration leads to a decrease in optical dot gain and that scattering in the paper results in the printed image's being viewed as more saturated in color. (C) 2001 Optical Society of America. OCIS codes: 100.7810, 290.7050.

  • 158.
    Zhang, Xueying
    et al.
    Taiyuan University of Technology, China.
    Huang, Lixia
    Taiyuan University of Technology, China.
    Evangelista, Gianpaolo
    Linköping University, Department of Science and Technology, Digital Media. Linköping University, The Institute of Technology.
    Warped Filter Banks Used in Noisy Speech Recognition2009In: Proc. IV Int. Conf. Innovative Computing, Information and Control (ICICIC-2009), 2009, p. 1385-1388Conference paper (Other academic)
    Abstract [en]

    The filter bank in the front-end of a speech recognition system mimics the function of the basilar membrane. It is believed that the closer the band subdivision is to human perception, the better the recognition results. This paper proposes the use of Warped Filter Banks (WFBs) to replace traditional FIR filter banks and validates its use for the recognition of noisy speech. The WFBs bandwidths can be warped by using a first-order allpass transformation replacing the unit delay. Different warped factors in the allpass function can make the different scaled filter banks. Experiments carried on isolated words for speaker independent speech recognition show that the recognition rate with our proposed WFBs has been effectively increased. 

     

     

  • 159. Zhukov, L
    et al.
    Museth, Ken
    Linköping University, Department of Science and Technology, Digital Media. Linköping University, The Institute of Technology.
    Breen, David
    Whitaker, Ross
    3D modeling and segmentation of Diffusion weighted MRI data2001In: SPIE Medical Imaging 01,2001, 2001, Vol. 4319, p. 401-412Conference paper (Refereed)
    Abstract [en]

    Diffusion weighted magnetic resonance imaging (DW MRI) is a technique that measures the diffusion properties of water molecules to produce a tensor-valued volume dataset. Because water molecules can diffuse more easily along fiber tracts, for example in the brain, rather than across them, diffusion is anisotropic and can be used for segmentation. Segmentation requires the identification of regions with different diffusion properties. In this paper we propose a new set of rotationally invariant diffusion measures which may be used to map the tensor data into a scalar representation. Our invariants may be rapidly computed because they do not require the calculation of eigenvalues. We use these invariants to analyze a 3D DW MRI scan of a human head and build geometric models corresponding to isotropic and anisotropic regions. We then utilize the models to perform quantitative analysis of these regions, for example calculating their surface area and volume.

  • 160. Zhukov, L
    et al.
    Museth, Ken
    Linköping University, Department of Science and Technology, Digital Media. Linköping University, The Institute of Technology.
    Breen, David
    Whitaker, Ross
    Barr, A
    Level Set Segmentation and Modeling of DT-MRI human brain data2003In: Journal of Electronic Imaging (JEI), ISSN 1017-9909, E-ISSN 1560-229X, Vol. 12, no 1, p. 125-133Article in journal (Refereed)
1234 151 - 160 of 160
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