Journal of the Japan society of photogrammetry and remote sensing
Online ISSN : 1883-9061
Print ISSN : 0285-5844
ISSN-L : 0285-5844
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Volume 49, Issue 5
Displaying 1-7 of 7 articles from this issue
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Preface
Original Papers
  • Normalized Wilt Index based on Visible/Near-Infrared Hyperspectral Analysis of Japanese Oak Wilt
    Kuniaki UTO, Yukio KOSUGI, Toshinari OGATA, Shinya ODAGAWA
    2010 Volume 49 Issue 5 Pages 294-309
    Published: November 12, 2010
    Released on J-STAGE: November 01, 2011
    DOIhttps://doi.org/10.4287/jsprs.49.294
    JOURNAL FREE ACCESS
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    We proposed a novel index, NWI, to detect oak wilt, which has been wide-spreading around Japan Sea seaboard of the main island of Japan, from remotely sensed visible/near-infrared hyperspectral data. At first, we estimate differences in composition between oak wilt and healthy oak leaves based on pure spectral data collected by leaf level measurements. Subsequently, we characterized the spectrum by two distinctive features based on three narrow bands of green, red, and near infrared, i.e. i) NDGI as a normalized difference between green and red band and the numerical, ii) (NDVI+NDGI) as an approximation of the second-order central difference at red band. The NWI, defined by the product of -NDGI and (NDVI+NDGI), indicates positive value only in case of oak wilt leaves. The application of the NWI to remotely sensed airborne hyperspectral images provides a high accuracy extraction of oak wilt with an Az value from conditional ROC analysis of 0.95.
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  • Calibration of the 3D Digital Camera “FinePix REAL 3D W1”
    Ryuji MATSUOKA, Genki TAKAHASHI, Kazuyoshi ASONUMA
    2010 Volume 49 Issue 5 Pages 310-319
    Published: November 12, 2010
    Released on J-STAGE: November 01, 2011
    DOIhttps://doi.org/10.4287/jsprs.49.310
    JOURNAL FREE ACCESS
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    The 3D digital camera FinePix REAL 3D W1, which was designed to take a pair of stereo images for stereo viewing, was released by FUJIFILM Cooperation in August 2009. The aim of our study is to evaluate camera calibration methods for measuring dimensions of an object on a sub-meter scale by using a pair of stereo images acquired by the camera without any controls. Three camera calibration methods were evaluated by estimation errors of length of line segments measured without any controls. The experiment results indicate that the best calibration method for the camera would be the method that ordinary camera calibration is first executed for each imaging unit in order to estimate its image distortion model, and then alignment between two imaging units is estimated by using two sets of the exterior orientation parameters of both imaging units obtained in the ordinary camera calibration executed previously.
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