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arXiv 1105.3829cs.DScs.CV
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分层递归运行中位数

Hierarchical Recursive Running Median

Technische Universität Berlin(柏林工业大学)

Alexander Alekseychuk

摘要:

到目前为止,Perreault和Hébert的基于直方图的运行中值滤波器被认为是8位图像最快的,平均情况下大约是O(1)。我们在这里提出了另一种近似常数时间算法,它进一步改进了上述算法,并具有较低的相关常数,在编写用于计算2D和更高维中值滤波器的最低理论复杂度算法时。该算法无需任何修改即可自然缩放到更高精度(例如16位)的整数数据。它的自适应版本提供了额外的加速图像显示紧凑模式的灰度值分布。与以前的恒定时间算法的实验比较定义了这种新发展的应用领域,除了理论上的兴趣,作为高比特深度数据和/或硬件没有SIMD扩展。该算法的C/C++实现在GPL下可用于研究目的。

英文摘要:

To date, the histogram-based running median filter of Perreault and Hébert is considered the fastest for 8-bit images, being roughly O(1) in average case. We present here another approximately constant time algorithm which further improves the aforementioned one and exhibits lower associated constant, being at the time of writing the lowest theoretical complexity algorithm for calculation of 2D and higher dimensional median filters. The algorithm scales naturally to higher precision (e.g. 16-bit) integer data without any modifications. Its adaptive version offers additional speed-up for images showing compact modes in gray-value distribution. The experimental comparison to the previous constant-time algorithm defines the application domain of this new development, besides theoretical interest, as high bit depth data and/or hardware without SIMD extensions. The C/C++ implementation of the algorithm is available under GPL for research purposes.

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