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摘要: 具有各向异性和多方向性的轮廓波变换是小波变换的扩展, 由于轮廓波变换本身的滤波器组结构使得它不具备平移不变性. 本文提出了一种具有平移不变性的类轮廓波变换(TICLT), 其冗余度比非抽样轮廓波变换(NSCT)和平移不变轮廓波变换(TICT)更低. TICLT由平移不变拉普拉斯塔式分解和非抽样方向滤波器组两部分构成. 本文以一维分数阶正交样条滤波器组为原型, 应用映射法设计满足完全重构条件的非抽样方向滤波器组. 与目前已有的去噪方法比较, 基于TICLT的图像去噪算法有明显优势.
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关键词:
- Contourlet变换 /
- 平移不变性 /
- 拉普拉斯塔式分解 /
- 图像去噪
Abstract: The contourlet transform with anisotropy and directionality is a new extension to the wavelet transform. Because of its filter bank structure, the contourlet transform is not translation-invariant. In this paper, we propose the translation-invariant contourlet-like transform (TICLT) with lower redundancy than both the nonsubsampled contourlet transform (NSCT) and the translation invariant contourlet transform (TICT). The TICLT is constructed by combining the translation invariant Laplacian pyramid and undecimated directional filter banks. The undecimated directional filter banks, which satisfy the perfect reconstruction condition, are designed by the mapping approach using one-dimensional fractional splines orthogonal filter banks as prototype filters. We evaluate the performance of the TICLT in image denoising. Some comparisons with the state-of-the-art denoising methods are given to illustrate the potential of the TICLT.-
Key words:
- Contourlet transform /
- translation invariant /
- Laplacian pyramid (LP) /
- image denoising
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