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    ASIA unversity > 資訊學院 > 資訊工程學系 > 期刊論文 >  Item 310904400/25331


    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/25331


    Title: A New Quality Improving Scheme for VQ Decompressed Images Based on DWT
    Authors: 周永振;Chou, Yung-Chen;Lo, Ya-Hsin;Lo, Ya-Hsin;沈肇基;Shen, Jaui-Ji
    Contributors: 資訊工程學系
    Date: 2013-03
    Issue Date: 2013-07-11 14:17:58 (UTC+8)
    Abstract: The better compression rate can be
    achieved by the traditional vector quantization (VQ)
    method, and the quality of the recovered image can also
    be accepted. But the decompressed image quality can
    not be promoted efficiently, so how to balance the image
    compression rate and image recovering quality is an
    important issue. In this paper, an image is transformed
    by discrete wavelet transform (DWT) to generate its
    DWT transformed image which can be compressed by
    the VQ method further. Besides, we compute the values
    between the DWT transformed image and
    decompressed DWT transformed image as the
    difference matrix which is the adjustable basis of the
    decompressed image quality. By controlling the
    deviation of the difference matrix, there can be nearly
    lossless compression for the VQ method. Experimental
    results show that when the number of compressed bits
    by our method is equal to the number of those bits
    compressed by the VQ method, the quality of our
    recovered image is better. Moreover, the proposed
    method has more compression capability comparing
    with the VQ scheme
    Relation: Journal of Electronic Science and Technology, V.11 N.1 : 51-57.
    Appears in Collections:[資訊工程學系] 期刊論文

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