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I mean that the algorithm implemented in OpenCV is the straightforward pixelwise implementation which is much slower than other more recent formulations. For instance:

• Paris S, Durand F (2006) A fast approximation of the bilateral filter using a signal processing approach. ECCV 2006
• Porikli F (2008) Constant time O(1) bilateral filtering. CVPR 2008
• Yang Q, Tan KH, Ahuja N (2009) Real-time O(1) bilateral filtering. CVPR 2009. *Galiano G, Velasco J (2015) On a fast bilateral filtering formulation using functional rearrangements. J Math Imaging Vision

I have C and C++ implementations of new formulations.

Hello all,

The algorithm implementing the bilateral filter is the old-fashioned pixel-based version of Banduchi and Tomasi.

Nowadays, there are much faster algorithms for the bilateral filter.

If someone answers, I can give her/him some references and even plain C implementations of those algorithms for creating a fork or whatever.

I don't do it myself because I'm not so good at efficient programing.

Cheers!