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Fractal Encoding by the Inner Product of DCT Coefficients and Local Variance
Author(s): 
Pages: 303-306
Year: Issue:  4
Journal: LASER & INFRARED

Keyword:  分形编码DCT内积;
Abstract: 文中定义了图像块的数字压缩技术(DCT)频域内积,并证明了该内积等于时域内积,从而可根据频域内积大小来作为分形编码中最佳匹配块的判断,并推导出DCT域上恒等变换与其余7种对称变换的关系.本文将值域块分为平稳、中间和活跃三类,研究对于不同类型的值域块,求频域内积时,保留低频系数个数和解码图像质量之间的关系,并提出了基于DCT域内积和方差的分形图像编码算法.在实验中,将本文算法分别同文献[2]、[3]中方法进行了比较,结果表明,本文算法能在基本保证解码图像质量的同时,大大提高编码速度.
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