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Symmetric Canonical Quincunx Tight Framelets with High Vanishing Moments and Smoothness

机译:具有高消失力矩的对称Canonical Quincunx紧框架   和顺畅

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摘要

We propose an approach to construct a family of two-dimensional compactlysupported real-valued symmetric quincunx tight framelets $\{\phi;\psi_1,\psi_2,\psi_3\}$ in $L_2(R^2)$ with arbitrarily high orders of vanishingmoments. Such symmetric quincunx tight framelets are associated with quincunxtight framelet filter banks $\{a;b_1,b_2,b_3\}$ having increasing orders ofvanishing moments and enjoying the additional double canonical properties: \[b_1(k_1,k_2)=(-1)^{1+k_1+k_2} a(1-k_1,-k_2), b_3(k_1,k_2)=(-1)^{1+k_1+k_2}b_2(1-k_1,-k_2). \] For a low-pass filter $a$ which is not a quincunxorthonormal wavelet filter, we show that a quincunx tight framelet filter bank$\{a;b_1,\ldots,b_L\}$ with $b_1$ taking the above canonical form must have$L\ge 3$ high-pass filters. Thus, our family of symmetric double canonicalquincunx tight framelets has the minimum number of generators. Numericalcalculation indicates that this family of symmetric double canonical quincunxtight framelets can be arbitrarily smooth. Using one-dimensional filters havinglinear-phase moments, in this paper we also provide a second approach toconstruct multiple canonical quincunx tight framelets with symmetry. Inparticular, the second approach yields a family of $6$-multiple canonicalreal-valued quincunx tight framelets in $L_2(R^2)$ and a family of doublecanonical complex-valued quincunx tight framelets in $L_2(R^2)$ such that bothof them have symmetry and arbitrarily increasing orders of smoothness andvanishing moments. Several examples are provided to illustrate our generalconstruction and theoretical results on canonical quincunx tight framelets in$L_2(R^2)$ with symmetry, high vanishing moments, and smoothness. Symmetricquincunx tight framelets constructed by both approaches in this paper are ofparticular interest for their applications in computer graphics and imageprocessing.
机译:我们提出了一种方法来构造一个二维紧凑支持的实值对称梅花紧紧小框架$ \ {\ phi; \ psi_1,\ psi_2,\ psi_3 \} $ in $ L_2(R ^ 2)$中的任意高阶消失的时刻。这种对称的梅花形紧框架与梅花形紧框架滤波器组$ \ {a; b_1,b_2,b_3 \} $具有消失矩增加的顺序并享受附加的双规范性质:\ [b_1(k_1,k_2)=(-1 )^ {1 + k_1 + k_2} a(1-k_1,-k_2),b_3(k_1,k_2)=(-1)^ {1 + k_1 + k_2} b_2(1-k_1,-k_2)。 \]对于不是梅花正交小波滤波器的低通滤波器$ a $,我们显示了梅花形紧紧小框架滤波器bank $ \ {a; b_1,\ ldots,b_L \} $,而$ b_1 $则采用上述规范表单必须具有$ L \ ge 3 $个高通滤波器。因此,我们的对称双正则梅花形紧小框架系列的生成器数量最少。数值计算表明,这种对称的双正典五轴紧小框架族可以是任意光滑的。使用具有线性相位矩的一维滤波器,在本文中,我们还提供了第二种方法来构造具有对称性的多个正则梅花形紧框架。特别是,第二种方法在$ L_2(R ^ 2)$中产生了一系列$ 6 $-多个规范实值的梅花紧框架,在$ L_2(R ^ 2)$中产生了双规范复值的梅花紧框架。它们都具有对称性,并且平滑度和消失力矩的阶数任意增加。提供了一些示例来说明我们在对称性,高消失力矩和平滑度的$ L_2(R ^ 2)$中的规范梅花紧框架上的一般构造和理论结果。通过这两种方法构造的对称梅花紧框架在其在计算机图形和图像处理中的应用特别受关注。

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