The Journal of The Institute of Image Information and Television Engineers
Online ISSN : 1881-6908
Print ISSN : 1342-6907
ISSN-L : 1342-6907
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Volume 61, Issue 9
Displaying 1-22 of 22 articles from this issue
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  • Comparison of Image Qualities of LCD and PDP
    Consideration of Relationship between Subjective Evaluation and Physical Properties
    Keita Hirai, Masayuki Ukishima, Bai Jie, Toshiya Nakaguchi, Norimichi ...
    2007 Volume 61 Issue 9 Pages 1352-1355
    Published: September 01, 2007
    Released on J-STAGE: December 25, 2009
    DOIhttps://doi.org/10.3169/itej.61.1352
    JOURNAL FREE ACCESS
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    In this paper,we compared image qualities of movies displayed on an LCD (liquid crystal display) and a PDP (plasma display panel) by conducting a subjective experiment and measuring physical properties measurements of the displays.We prepared sixteen movies with different dynamic range,saturation,contrast and colorfulness,and 42 observers rated the quality of the movies.We also measured the displays' physical properties such as the luminance,chromaticity.We analyzed the relationship between the observers' ratings and the measured physical properties and found that the distribution of the luminance histogram is an important factor that affects the observers' reactions to the movies.
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  • Efficient Gaussian Source Coding Based on Distribution Mapping
    Seishi Takamura, Yoshiyuki Yashima
    2007 Volume 61 Issue 9 Pages 1357-1362
    Published: September 01, 2007
    Released on J-STAGE: December 25, 2009
    DOIhttps://doi.org/10.3169/itej.61.1357
    JOURNAL FREE ACCESS
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    Gaussian sources are commonly found in the fields of mathematics and engineering.There is instantaneous code for geometric and two-sided geometric distributions; however,there is no simple,instantaneous code for normal distributions.Therefore,we have developed a method of mapping a normal distribution onto a geometric distribution before applying Golomb codes.Experimental results showed that our method consistently yielded coding efficiency of more than 98% for quantized Gaussian sources,which is comparable to the coding efficiency of second-order Huffman codes.For actual video coding residual signals,our codes were more efficient by six points than straightforward Golomb codes.Furthermore,we developed and demonstrated an accurate estimation method for determining optimal Golomb parameters,and we investigated the use of hybrid coding to enhance the coding performance.
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  • Soccer Event Classification Based on Formation Analysis of Player Positions
    Toshie Misu, Masahide Naemura, Mahito Fujii, Nobuyuki Yagi
    2007 Volume 61 Issue 9 Pages 1367-1375
    Published: September 01, 2007
    Released on J-STAGE: December 25, 2009
    DOIhttps://doi.org/10.3169/itej.61.1367
    JOURNAL FREE ACCESS
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    We have developed a method that analyzes player formations in order to classify kick and throw-in events in soccer matches.Formations are described in terms of local head counts and mean velocities,which are converted into canonical variates using a Fisher weight map in order to select effective variates for discriminating between events.The map is acquired by supervised learning.The distribution of the variates for each event class is modeled by Gaussian mixtures in order to handle its multimodality in canonical space.Our experiments showed that the Fisher weight map extracted semantically explicable variates related to such situations as players at corners and left/right separation.Our experiments also showed that characteristically formed events,such as kick-offs and corner-kicks,were successfully classified by the Gaussian mixture models.
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  • A Study on Fast Method for Image Up-Sampling Using Neighboring Blocks in DCT Domain
    Tomio Goto, Yoshihiro Shinkai, Masaru Sakurai, Tadashi Kitamura
    2007 Volume 61 Issue 9 Pages 1363-1366
    Published: September 01, 2007
    Released on J-STAGE: December 25, 2009
    DOIhttps://doi.org/10.3169/itej.61.1363
    JOURNAL FREE ACCESS
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    We have studied a number of approaches to processing resolution conversion in the discrete cosinetransform (DCT) domain because the JPEG, MPEG-1, -2, -4 standards based on DCT are widely used for image/video compression. Resolution conversion in the DCT domain is generally processed using a DCT block, which can lead to blocky noise appearing in scaled-up images. We have developed a method of high speed processing so that the time taken to scale up images is reduced. We developed the method because a method we previously developed to improve image quality during resolution conversion in the discrete cosine transform (DCT) domain was too slow at scaling up images. This previous method takes in uses the correlation between DCT blocks. It produces fine images without blocky noise and improves PSNR and GBIM.
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