First Order Statistics Filter (Sigma Filter / Lee's Filter)

First order local neighborhood statistics based image denoising filter.

fcnFirstOrderStatisticsFilter performs noise filtering on an image based on using First Order Local Statistics around a prespecified pixel neighborhood. The method is based on

[1] J. S. Lee, "Digital image smoothing and sigma filter," Computer Vision, Graphics and Image Processing, vol. 24, no. 2, pp. 255–269, 1983. [http://dx.doi.org/10.1016/0734-189X(83)90047-6]

The implementation is as based on

[1] D. Sheet, S. Pal, A. Chakraborty, J. Chatterjee, A.K. Ray, "Image quality assessment for performance evaluation of despeckle filters in Optical Coherence Tomography of human skin," 2010 IEEE EMBS Conf. Biomedical Engineering and Sciences (IECBES), pp.499-504, Nov. 30 2010 - Dec. 2 2010. [http://dx.doi.org/10.1109/IECBES.2010.5742289]

[2] D. Sheet, S. Pal, A. Chakraborty, J. Chatterjee, A.K. Ray, "Visual importance pooling for image quality assessment of despeckle filters in Optical Coherence Tomography," 2010 Intl. Conf. Systems in Medicine and Biology (ICSMB), pp.102-107, 16-18 Dec. 2010. [http://dx.doi.org/10.1109/ICSMB.2010.5735353]