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长春光学精密机械与物... [1]
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会议论文 [1]
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2006 [1]
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内容类型:会议论文
专题:长春光学精密机械与物理研究所
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Wavelet-fractal based compression of ophthalmic image (EI CONFERENCE)
会议论文
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
Xiu-Ying Z.
;
Lin-Pei Z.
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提交时间:2013/03/25
This study is designed to determine the degree and methods of digital image compression to produce ophthalmic images of sufficient quality for transmission and diagnosis. Fractal based compression techniques
which provide a large compression ratio for grayscale images have been reported in the literature. Fractal coding is based on the fractal theory of iterated transformations. But
it's searching and mapping algorithm cannot address the need of real-time. To improve the real-time performance of the algorithm
we use wavelet transforms to decompose images. The wavelet transform is a natural tool for analyzing fractal block coders since wavelet bases possess the same type of dyadic self-similarity that fractal coders seek to exploit. We propose a method of fractal coding the weighted wavelet subtree. Experimented results show that the improved hybrid image can improve the PSNR of the rebuild image at the same compression ratio.
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