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Theory and Practice of Image B-Spline Interpolation

机译:图像B样条插值的理论与实践

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We explain how the B-spline interpolation of signals and, in particular, of images can be efficiently performed by linear filtering. Based on the seminal two-step method proposed by Unser et al. in 1991, we propose two slightly different prefiltering algorithms whose precisions are proven to be controlled thanks to a rigorous boundary handling. This paper contains all the information, theoretical and practical, required to perform efficiently B-spline interpolation for any order and any boundary extension. We describe precisely how to evaluate the kernel and to compute the B-spline interpolator parameters. We show experimentally that increasing the order improves the interpolation quality. As a fundamental application we also provide an implementation of homographic transformation of images using B-spline interpolation.
机译:我们将说明如何通过线性滤波有效地执行信号(尤其是图像)的B样条插值。基于Unser等人提出的开创性两步法。在1991年,我们提出了两种略有不同的预滤波算法,这些算法的精确度由于严格的边界处理而得到控制。本文包含有效执行任何顺序和边界扩展的B样条插值所需的所有理论和实践信息。我们精确地描述了如何评估内核以及如何计算B样条插值器参数。我们通过实验表明,增加阶数可以改善插值质量。作为基本应用程序,我们还提供了使用B样条插值法对图像进行单应变换的实现。

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