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  • Key words Hydroxypropylmethylcellulose  (2)
  • Key words:Augmented reality – Enriched image sequence – Viewpoint determination – Tracking  (1)
  • 1995-1999  (3)
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Keywords
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  • 1995-1999  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Mixing synthetic and video images of an outdoor urban environment (1999)
    Springer
    Machine vision and applications 11 (1999), S. 145-159 
    Details
    ISSN: 1432-1769
    Keywords: Key words:Augmented reality – Enriched image sequence – Viewpoint determination – Tracking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract. Mixing video and computer-generated images is a new and promising area of research for enhancing reality. It can be used in all the situations when a complete simulation would not be easy to implement. Past work on the subject has relied for a large part on human intervention at key moments of the composition. In this paper, we show that if enough geometric information about the environment is available, then efficient tools developed in the computer vision literature can be used to build a highly automated augmented reality loop. We focus on outdoor urban environments and present an application for the visual assessment of a new lighting project of the bridges of Paris. We present a fully augmented 300-image sequence of a specific bridge, the Pont Neuf. Emphasis is put on the robust calculation of the camera position. We also detail the techniques used for matching 2D and 3D primitives and for tracking features over the sequence. Our system overcomes two major difficulties. First, it is capable of handling poor-quality images, resulting from the fact that images were shot at night since the goal was to simulate a new lighting system. Second, it can deal with important changes in viewpoint position and in appearance along the sequence. Throughout the paper, many results are shown to illustrate the different steps and difficulties encountered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001380050098
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of hydroxypropyl- methylcellulose-stabilized emulsions (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 1019-1023 
    Details
    ISSN: 1435-1536
    Keywords: Key words Hydroxypropylmethylcellulose ; emulsions ; particle size ; active laser scanning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Emulsions stabilized with hydroxypropylmethylcellulose were characterized with respect to their particle size and their flow behavior. This part of the study focuses on the former. Active laser scanning revealed that the particle size is independent of the hydroxymethylcellulose content. The critical density of the surface film was determined to be ≤0.01 g/m2. This is the basis for the interpretation of the flow behavior, which is described in detail in part II of this contribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050341
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of hydroxypropylmethyl- cellulose-stabilized emulsions (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 1024-1031 
    Details
    ISSN: 1435-1536
    Keywords: Key words Hydroxypropylmethylcellulose ; emulsions ; stabilization ; flow behavior ; rheometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Emulsions stabilized with hydroxypropylmethylcellulose were characterized with respect to their particle size and their flow behavior. This part of the study focuses on the latter. During shear experiments an increase in viscosity was detected with increasing phase volume fraction. After a critical phase volume fraction, φ, of 0.6 had been exceeded, yield stresses of between 7 and 17 Pa were exhibited. In the emulsions without yield stress the relative emulsion viscosities were examined against the relevant theories, which resulted in good agreement being found with the predictions of Krieger and Dougherty. Using the extrapolated maximum phase volume fraction, it was thus possible to calculate the thickness of the adsorbate layer as approximately 60 nm. In the dynamic measurements, a maximum was determined for the material functions. This was attributed to shear-induced restructuring processes in the emulsions. The dynamic measurements in the linear viscoelastic range showed that, in spite of increasing phase volume fraction, the critical relaxation time decreased, whereas the values of the moduli rose at small oscillation frequencies. Time-dependent measurements showed that thixotropy was detected for emulsions with a phase volume fraction of φ≥0.7. Creep tests showed that the compliance fell with increasing phase volume fraction. The zero shear modulus and the relative elastic compliance were calculated for the emulsions that exhibited yield stresses. Good agreement was found between the zero shear modulus and the values for the storage modulus determined in dynamic measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050342
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